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Zinc oxide-ternary heterostructure Mn3O4/ZnO/Eu2O3 nanocomposites were successfully prepared via waste curd as fuel by a facile one-pot combustion procedure. The fabricated heterostructures were characterized utilizing XRD, UV–Visible, FT-IR, FE-SEM, HRTEM and EDX analysis. The photocatalytic degradation efficacy of the synthesized ternary nanocomposite was evaluated utilizing model organic pollutants of methylene blue (MB) and methyl orange (MO) in water as examples of cationic dyes and anionic dyes, respectively, under natural solar irradiation. The effect of various experimental factors, viz. the effect of a light source, catalyst dosage, irradiation time, pH of dye solution and dye concentration on the photodegradation activity, was systematically studied. The ternary Mn3O4/ZnO/Eu2O3 photocatalyst exhibited excellent MB and MO degradation activity of 98% and 96%, respectively, at 150 min under natural sunlight irradiation. Experiments further conclude that the fabricated nanocomposite exhibits pH-dependent photocatalytic efficacy, and for best results, concentrations of dye and catalysts have to be maintained in a specific range. The prepared photocatalysts are exemplary and could be employed for wastewater handling and several ecological applications.
Jayachamarajapura Shubha; Haralahalli Savitha; Syed Adil; Mujeeb Khan; Mohammad Hatshan; Kiran Kavalli; Baji Shaik. Straightforward Synthesis of Mn3O4/ZnO/Eu2O3-Based Ternary Heterostructure Nano-Photocatalyst and Its Application for the Photodegradation of Methyl Orange and Methylene Blue Dyes. Molecules 2021, 26, 4661 .
AMA StyleJayachamarajapura Shubha, Haralahalli Savitha, Syed Adil, Mujeeb Khan, Mohammad Hatshan, Kiran Kavalli, Baji Shaik. Straightforward Synthesis of Mn3O4/ZnO/Eu2O3-Based Ternary Heterostructure Nano-Photocatalyst and Its Application for the Photodegradation of Methyl Orange and Methylene Blue Dyes. Molecules. 2021; 26 (15):4661.
Chicago/Turabian StyleJayachamarajapura Shubha; Haralahalli Savitha; Syed Adil; Mujeeb Khan; Mohammad Hatshan; Kiran Kavalli; Baji Shaik. 2021. "Straightforward Synthesis of Mn3O4/ZnO/Eu2O3-Based Ternary Heterostructure Nano-Photocatalyst and Its Application for the Photodegradation of Methyl Orange and Methylene Blue Dyes." Molecules 26, no. 15: 4661.
A-π-D-π-A-based small molecules 6,6′-((thiophene-2,5-diylbis(ethyne-2,1-diyl))bis(thiophene-5,2-diyl))bis(2,5-bis(2-ethylhexyl)-3-(thiophen-2-yl)-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione) (TDPP-T) and 6,6′-(((2,3-dihydrothieno[3,4-b][1,4]dioxine-5,7-diyl)bis(ethyne-2,1-diyl))bis(thiophene-5,2-diyl))bis(2,5-bis(2-ethylhexyl)-3-(thiophen-2-yl)-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione) (TDPP-EDOT) have been designed and synthesized. The diketopyrrolopyrrole acts as an electron acceptor, while the thiophene or 3,4-ethylenedioxythiophene acts as an electron donor. The donor–acceptor groups are connected by an ethynyl bridge to further enhance the conjugation. The optoelectronics, electrochemical, and thermal properties have been investigated. Organic thin film transistor (OTFT) devices prepared from TDPP-T and TDPP-EDOT have shown p-type mobility. In as cast films, TDPP-T and TDPP-EDOT have shown a hole mobility of 5.44 × 10−6 cm2 V−1 s−1 and 4.13 × 10−6 cm2 V−1 s−1, respectively. The increase in the mobility of TDPP-T and TDPP-EDOT OTFT devices was observed after annealing at 150 °C, after which the mobilities were 3.11 × 10−4 cm2 V−1 s−1 and 2.63 × 10−4 cm2 V−1 s−1, respectively.
Baji Shaik; Mujeeb Khan; Mohammed Shaik; Mohammed Sharaf; Doumbia Sekou; Sang-Gyeong Lee. A-π-D-π-A-Based Small Molecules for OTFTs Containing Diketopyrrolopyrrole as Acceptor Units. Micromachines 2021, 12, 817 .
AMA StyleBaji Shaik, Mujeeb Khan, Mohammed Shaik, Mohammed Sharaf, Doumbia Sekou, Sang-Gyeong Lee. A-π-D-π-A-Based Small Molecules for OTFTs Containing Diketopyrrolopyrrole as Acceptor Units. Micromachines. 2021; 12 (7):817.
Chicago/Turabian StyleBaji Shaik; Mujeeb Khan; Mohammed Shaik; Mohammed Sharaf; Doumbia Sekou; Sang-Gyeong Lee. 2021. "A-π-D-π-A-Based Small Molecules for OTFTs Containing Diketopyrrolopyrrole as Acceptor Units." Micromachines 12, no. 7: 817.
Catalytic efficacy of metal-based catalysts can be significantly enhanced by doping graphene or its derivatives in the catalytic protocol. In continuation of previous work regarding the catalytic properties of highly-reduced graphene oxide (HRG), graphene-oxide (GO) doped mixed metal oxide-based nanocomposites, herein we report a simple, straightforward and solventless mechanochemical preparation of N-doped graphene (NDG)/mixed metal oxide-based nanocomposites of ZnO–MnCO3 (i.e., ZnO–MnCO3/(X%-NDG)), wherein N-doped graphene (NDG) is employed as a dopant. The nanocomposites were prepared by physical milling of separately fabricated NDG and ZnO–MnCO3 calcined at 300 °C through eco-friendly ball mill procedure. The as-obtained samples were characterized via X-ray diffraction (XRD), Thermogravimetric analysis (TGA), Fourier-transform infrared spectroscopy (FT-IR), Raman, Field emission scanning electron microscopy (FESEM), Energy-dispersive X-ray spectroscopy (EDX) and surface area analysis techniques. To explore the effectiveness of the obtained materials, liquid-phase dehydrogenation of benzyl alcohol (BOH) to benzaldehyde (BH) was chosen as a benchmark reaction using eco-friendly oxidant (O2) without adding any harmful surfactants or additives. During the systematic investigation of reaction, it was revealed that the ZnO–MnCO3/NDG catalyst exhibited very distinct specific-activity (80 mmol/h.g) with a 100% BOH conversion and <99% selectivity towards BH in a very short time. The mechanochemically synthesized NDG-based nanocomposite showed remarkable enhancement in the catalytic performance and increased surface area compared with the catalyst without graphene (i.e., ZnO–MnCO3). Under the optimum catalytic conditions, the catalyst successfully transformed various aromatic, heterocyclic, allylic, primary, secondary and aliphatic alcohols to their respective ketones and aldehydes with high selectively and convertibility without over-oxidation to acids. In addition, the ZnO–MnCO3/NDG was also recycled up to six times with no apparent loss in its efficacy.
Mujeeb Khan; Syed Adil; Mohamed Assal; Abdulrahman Alharthi; Mohammed Shaik; Mufsir Kuniyil; Abdulrahman Al-Warthan; Aslam Khan; Zeeshan Nawaz; Hamid Shaikh; Mohammed Siddiqui. Solventless Mechanochemical Fabrication of ZnO–MnCO3/N-Doped Graphene Nanocomposite: Efficacious and Recoverable Catalyst for Selective Aerobic Dehydrogenation of Alcohols under Alkali-Free Conditions. Catalysts 2021, 11, 760 .
AMA StyleMujeeb Khan, Syed Adil, Mohamed Assal, Abdulrahman Alharthi, Mohammed Shaik, Mufsir Kuniyil, Abdulrahman Al-Warthan, Aslam Khan, Zeeshan Nawaz, Hamid Shaikh, Mohammed Siddiqui. Solventless Mechanochemical Fabrication of ZnO–MnCO3/N-Doped Graphene Nanocomposite: Efficacious and Recoverable Catalyst for Selective Aerobic Dehydrogenation of Alcohols under Alkali-Free Conditions. Catalysts. 2021; 11 (7):760.
Chicago/Turabian StyleMujeeb Khan; Syed Adil; Mohamed Assal; Abdulrahman Alharthi; Mohammed Shaik; Mufsir Kuniyil; Abdulrahman Al-Warthan; Aslam Khan; Zeeshan Nawaz; Hamid Shaikh; Mohammed Siddiqui. 2021. "Solventless Mechanochemical Fabrication of ZnO–MnCO3/N-Doped Graphene Nanocomposite: Efficacious and Recoverable Catalyst for Selective Aerobic Dehydrogenation of Alcohols under Alkali-Free Conditions." Catalysts 11, no. 7: 760.
The conventional physical and chemical synthetic methods for the preparation of metal nanoparticles have disadvantages as they use expensive equipment and hazardous chemicals which limit their applications for biomedical purposes, and are not environment friendly. However, for the synthesis of biocompatible nanomaterials, plant-based techniques are eco-friendly and easy to handle. Herein a simple, single-step biosynthesis of gold nanoparticles using aqueous extracts of Nigella sativa (NSE) and Zingiber officinale (GE) as a reducing and capping agent has been demonstrated. The formation of gold nanoparticles (Au NPs) was confirmed by X-ray diffraction, UV-Vis, and EDS spectroscopies. Spectroscopic and chromatographic analysis of GE and NSE revealed the presence of bioactive phytochemical constituents, such as gingerol, thymoquinone, etc., which successfully conjugated the surface of resulting Au NPs. TEM analysis indicated the formation of smaller-sized, less-aggregated, spherical-shaped Au NPs both in the case of GE (~9 nm) and NSE (~11 nm). To study the effect of the concentration of the extracts on the quality of resulting NPs and their anticancer properties, three different samples of Au NPs were prepared from each extract by varying the concentration of extracts while keeping the amount of precursor constant. In both cases, high-quality, spherical-shaped NPs were obtained, only at a high concentration of the extract, whereas at lower concentrations, larger-sized, irregular-shaped NPs were formed. Furthermore, the as-prepared Au NPs were evaluated for the anticancer properties against two different cell lines including MDA-MB-231 (breast cancer) and HCT 116 (colorectal cancer) cell lines. GE-conjugated Au NPs obtained by using a high concentration of the extract demonstrated superior anticancer properties when compared to NSE-conjugated counterparts.
Alaa Alkhathlan; Hessah Al-Abdulkarim; Merajuddin Khan; Mujeeb Khan; Musaed Alkholief; Aws Alshamsan; Aliyah Almomen; Norah Albekairi; Hamad Alkhathlan; M. Siddiqui. Evaluation of the Anticancer Activity of Phytomolecules Conjugated Gold Nanoparticles Synthesized by Aqueous Extracts of Zingiber officinale (Ginger) and Nigella sativa L. Seeds (Black Cumin). Materials 2021, 14, 3368 .
AMA StyleAlaa Alkhathlan, Hessah Al-Abdulkarim, Merajuddin Khan, Mujeeb Khan, Musaed Alkholief, Aws Alshamsan, Aliyah Almomen, Norah Albekairi, Hamad Alkhathlan, M. Siddiqui. Evaluation of the Anticancer Activity of Phytomolecules Conjugated Gold Nanoparticles Synthesized by Aqueous Extracts of Zingiber officinale (Ginger) and Nigella sativa L. Seeds (Black Cumin). Materials. 2021; 14 (12):3368.
Chicago/Turabian StyleAlaa Alkhathlan; Hessah Al-Abdulkarim; Merajuddin Khan; Mujeeb Khan; Musaed Alkholief; Aws Alshamsan; Aliyah Almomen; Norah Albekairi; Hamad Alkhathlan; M. Siddiqui. 2021. "Evaluation of the Anticancer Activity of Phytomolecules Conjugated Gold Nanoparticles Synthesized by Aqueous Extracts of Zingiber officinale (Ginger) and Nigella sativa L. Seeds (Black Cumin)." Materials 14, no. 12: 3368.
Biofilms not only protect bacteria and Candida species from antibiotics, but they also promote the emergence of drug-resistant strains, making eradication more challenging. As a result, novel antimicrobial agents to counteract biofilm formation are desperately needed. In this study, Terminalia catappa leaf extract (TCE) was used to optimize the TCE-capped silver nanoparticles (TCE-AgNPs) via a one-pot single-step method. Varied concentrations of TCE have yielded different sized AgNPs. The physico-chemical characterization of TCE-AgNPs using UV-Vis, SEM, TEM, FTIR, and Raman spectroscopy have confirmed the formation of nanostructures, their shape and size and plausible role of TCE bio-active compounds, most likely involved in the synthesis as well as stabilization of NPs, respectively. TCE-AgNPs have been tested for antibiofilm and antimicrobial activity against multidrug-resistant Pseudomonas aeruginosa (MDR-PA), methicillin-resistant Staphylococcus aureus (MRSA), and Candida albicans using various microbiological protocols. TCE-Ag-NPs−3 significantly inhibits biofilm formation of MDR-PA, MRSA, and C. albicans by 73.7, 69.56, and 63.63%, respectively, at a concentration of 7.8 µg/mL, as determined by crystal violet microtiter assay. Furthermore, SEM micrograph shows that TCE-AgNPs significantly inhibit the colonization and adherence of biofilm forming cells; individual cells with loss of cell wall and membrane integrity were also observed, suggesting that the biofilm architecture and EPS matrix were severely damaged. Moreover, TEM and SEM images showed that TCE-AgNPs brutally damaged the cell wall and membranes of MDR-PA, MRSA, and C. albicans. Additionally, extreme ultrastructural changes such as deformation, disintegration, and separation of cell wall and membrane from the cells, have also been observed, indicating significant loss of membrane and cell wall integrity, which eventually led to cell death. Overall, the research revealed a simple, environmentally friendly, and low-cost method for producing colloidal TCE-AgNPs with promising applications in advanced clinical settings against broad-spectrum biofilm-forming antibiotic-resistant bacteria and candida strains.
Mohammad Ansari; Abul Kalam; Abdullah Al-Sehemi; Mohammad Alomary; Sami AlYahya; Mohammad Aziz; Shekhar Srivastava; Saad Alghamdi; Sultan Akhtar; Hussain Almalki; Syed Adil; Mujeeb Khan; Mohammad Hatshan. Counteraction of Biofilm Formation and Antimicrobial Potential of Terminalia catappa Functionalized Silver Nanoparticles against Candida albicans and Multidrug-Resistant Gram-Negative and Gram-Positive Bacteria. Antibiotics 2021, 10, 725 .
AMA StyleMohammad Ansari, Abul Kalam, Abdullah Al-Sehemi, Mohammad Alomary, Sami AlYahya, Mohammad Aziz, Shekhar Srivastava, Saad Alghamdi, Sultan Akhtar, Hussain Almalki, Syed Adil, Mujeeb Khan, Mohammad Hatshan. Counteraction of Biofilm Formation and Antimicrobial Potential of Terminalia catappa Functionalized Silver Nanoparticles against Candida albicans and Multidrug-Resistant Gram-Negative and Gram-Positive Bacteria. Antibiotics. 2021; 10 (6):725.
Chicago/Turabian StyleMohammad Ansari; Abul Kalam; Abdullah Al-Sehemi; Mohammad Alomary; Sami AlYahya; Mohammad Aziz; Shekhar Srivastava; Saad Alghamdi; Sultan Akhtar; Hussain Almalki; Syed Adil; Mujeeb Khan; Mohammad Hatshan. 2021. "Counteraction of Biofilm Formation and Antimicrobial Potential of Terminalia catappa Functionalized Silver Nanoparticles against Candida albicans and Multidrug-Resistant Gram-Negative and Gram-Positive Bacteria." Antibiotics 10, no. 6: 725.
Graphene nanocomposites have gained significant interest in a variety of biological applications due to their unique properties. Herein, we have studied the apoptosis-inducing ability and anticancer properties of functionalized highly reduced graphene oxide (HRG) and gold nanoparticles (Au NPs)-based nanocomposites (AP-HRG-Au). Samples were prepared under facile conditions via simple stirring and ultrasonication. All the samples were tested for their anticancer properties against different human cancer cell lines including lung (A549), liver (HepG2), and breast (MCF-7) cancer cells using doxorubicin as a positive control. In order to enhance the solubility and bioavailability of the sample, HRG was functionalized with 1-aminopyrene (1-AP) as a stabilizing ligand. The ligand also facilitated the homogeneous growth of Au NPs on the surface of HRG by offering chemically specific binding sites. The synthesis of nanocomposites and the surface functionalization of HRG were confirmed by UV–Vis, powder X-ray diffraction, and Fourier transform infrared spectroscopy. The structure and morphology of the as-prepared nanocomposites were established by high-resolution transmission electron microscopy. Because of the functionalization, the AP-HRG-Au nanocomposite exhibited enhanced physical stability and high dispersibility. A comparative anticancer study of pristine HRG, nonfunctionalized HRG-Au, and 1-AP-functionalized AP-HRG-Au nanocomposites revealed the enhanced apoptosis ability of functionalized nanocomposites compared to the nonfunctionalized sample, whereas the pristine HRG did not show any anticancer ability against all tested cell lines. Both HRG-Au and AP-HRG-Au have induced a concentration-dependent reduction in cell viability in all tested cell lines after 48 h of exposure, with a significantly higher response in MCF-7 cells compared to the remaining cells. Therefore, MCF-7 cells were selected to perform detailed investigations using apoptosis assay, cell cycle analysis, and reactive oxygen species measurements. These results suggest that AP-HRG-Au induces enhanced apoptosis in human breast cancer cells.
Syed Farooq Adil; Mohammed Rafi Shaik; Fahd A. Nasr; Ali S. Alqahtani; Mohammad Z. Ahmed; Wajhul Qamar; Mufsir Kuniyil; Adibah Almutairi; Abdulrahman Alwarthan; Mohammed Rafiq H. Siddiqui; Mohammad Rafe Hatshan; Mujeeb Khan. Enhanced Apoptosis by Functionalized Highly Reduced Graphene Oxide and Gold Nanocomposites in MCF-7 Breast Cancer Cells. ACS Omega 2021, 6, 15147 -15155.
AMA StyleSyed Farooq Adil, Mohammed Rafi Shaik, Fahd A. Nasr, Ali S. Alqahtani, Mohammad Z. Ahmed, Wajhul Qamar, Mufsir Kuniyil, Adibah Almutairi, Abdulrahman Alwarthan, Mohammed Rafiq H. Siddiqui, Mohammad Rafe Hatshan, Mujeeb Khan. Enhanced Apoptosis by Functionalized Highly Reduced Graphene Oxide and Gold Nanocomposites in MCF-7 Breast Cancer Cells. ACS Omega. 2021; 6 (23):15147-15155.
Chicago/Turabian StyleSyed Farooq Adil; Mohammed Rafi Shaik; Fahd A. Nasr; Ali S. Alqahtani; Mohammad Z. Ahmed; Wajhul Qamar; Mufsir Kuniyil; Adibah Almutairi; Abdulrahman Alwarthan; Mohammed Rafiq H. Siddiqui; Mohammad Rafe Hatshan; Mujeeb Khan. 2021. "Enhanced Apoptosis by Functionalized Highly Reduced Graphene Oxide and Gold Nanocomposites in MCF-7 Breast Cancer Cells." ACS Omega 6, no. 23: 15147-15155.
Palladium-based carbon catalysts (Pd/C) can be potentially applied as an efficient catalyst for Suzuki–Miyaura and Mizoroki–Heck coupling reactions. Herein, a variety of catalysts of palladium on activated carbon were prepared by varying the content of ‘Pd’ via an in situ reduction method, using hydrogen as a reducing agent. The as-prepared catalysts (0.5 wt % Pd/C, 1 wt % Pd/C, 2 wt % Pd/C and 3 wt % Pd/C) were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and Brunauer–Emmett–Teller (BET) analyses. The catalysts were tested as a coupling catalyst for Suzuki–Miyaura coupling reactions involving aryl halides and phenyl boronic acid. The optimization of the catalyst by varying the palladium content on the activated carbon yielded Pd/C catalysts with very high catalytic activity for Suzuki reactions of aryl halides and a Mizoroki–Heck cross-coupling reaction of 4-bromoanisol and acrylic acid in an aqueous medium. A high ‘Pd’ content and uniform ‘Pd’ impregnation significantly affected the activity of the catalysts. The catalytic activity of 3% Pd/C was found to make it a more efficient catalyst when compared with the other synthesized Pd/C catalysts. Furthermore, the catalyst reusability was also tested for Suzuki reactions by repeatedly performing the same reaction using the recovered catalyst. The 3% Pd/C catalyst displayed better reusability even after several reactions.
Hamed Alshammari; Obaid Aldosari; Mohammad Alotaibi; Raja Alotaibi; Mosaed Alhumaimess; Moataz Morad; Syed Adil; Mohammed Shaik; Mohammad Islam; Mujeeb Khan; Abdulrahman Alwarthan. Facile Synthesis and Characterization of [email protected] Catalyst for the Suzuki-Miyaura and Mizoroki-Heck Coupling Reactions. Applied Sciences 2021, 11, 4822 .
AMA StyleHamed Alshammari, Obaid Aldosari, Mohammad Alotaibi, Raja Alotaibi, Mosaed Alhumaimess, Moataz Morad, Syed Adil, Mohammed Shaik, Mohammad Islam, Mujeeb Khan, Abdulrahman Alwarthan. Facile Synthesis and Characterization of [email protected] Catalyst for the Suzuki-Miyaura and Mizoroki-Heck Coupling Reactions. Applied Sciences. 2021; 11 (11):4822.
Chicago/Turabian StyleHamed Alshammari; Obaid Aldosari; Mohammad Alotaibi; Raja Alotaibi; Mosaed Alhumaimess; Moataz Morad; Syed Adil; Mohammed Shaik; Mohammad Islam; Mujeeb Khan; Abdulrahman Alwarthan. 2021. "Facile Synthesis and Characterization of [email protected] Catalyst for the Suzuki-Miyaura and Mizoroki-Heck Coupling Reactions." Applied Sciences 11, no. 11: 4822.
The mixed metal oxides Bi2MoO6 and La-doped Bi2MoO6 were prepared by the sol–gel method. Then, varying quantities of the as-prepared mixed metal oxides were blended with graphene oxide (GO), employing sonication, to obtain Bi2MoO6 /GO (BM/GO) and La-Bi2MoO6 /GO (LBM/GO) nanocomposites. These prepared materials were characterized by different techniques such as thermal gravimetric analysis (TGA), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), and transmission electron microscopy (TEM). Dielectric properties were studied by using a precision impedance analyzer. Dielectric constant and loss tan of the synthesized composites were studied as a function of frequency by using a precision impedance analyzer. Overall, the dielectric constant (ɛ’) observed for the LBM/GO composites was higher than that of BM/GO.
Syed Adil; Shoomaila Latif; Muhammad Waqar; Muhammad Imran; Sadia Noreen; Mujeeb Khan; Mohammed Shaik; Mohammad Hatshan. Dielectric Studies of Bi2MoO6/Graphene Oxide and La-Doped Bi2MoO6/Graphene Oxide Nanocomposites. Metals 2021, 11, 559 .
AMA StyleSyed Adil, Shoomaila Latif, Muhammad Waqar, Muhammad Imran, Sadia Noreen, Mujeeb Khan, Mohammed Shaik, Mohammad Hatshan. Dielectric Studies of Bi2MoO6/Graphene Oxide and La-Doped Bi2MoO6/Graphene Oxide Nanocomposites. Metals. 2021; 11 (4):559.
Chicago/Turabian StyleSyed Adil; Shoomaila Latif; Muhammad Waqar; Muhammad Imran; Sadia Noreen; Mujeeb Khan; Mohammed Shaik; Mohammad Hatshan. 2021. "Dielectric Studies of Bi2MoO6/Graphene Oxide and La-Doped Bi2MoO6/Graphene Oxide Nanocomposites." Metals 11, no. 4: 559.
Oxidation is an important organic transformation, and several catalysts have been reported for this conversion. In this study, we report the synthesis of mixed metal oxide Cu x Zn y O, which is prepared by a coprecipitation method by varying the molar ratio of Cu and Zn in the catalytic system. The prepared mixed metal oxide Cu x Zn y O was evaluated for catalytic performance for toluene oxidation. Various parameters of the catalytic evaluation were studied in order to ascertain the optimum condition for the best catalytic performance. The results indicate that aging time, calcination temperature, reaction temperature, and feed rate influence catalytic performance. It was found that the catalyst interfaces apparently enhanced catalytic activity for toluene oxidation. The XRD diffractograms reveal the crystalline nature of the mixed metal oxide formed and also confirm the coexistence of hexagonal and monoclinic crystalline phases. The catalyst prepared by aging for 4 h and calcined at 450 °C was found to be the best for the conversion of toluene to benzaldehyde while the reactor temperature was maintained at 250 °C with toluene fed into the reactor at 0.01 mL/min. The catalyst was active for about 13 h.
Khadijah Alharbi; Ali Alsalme; Ahmed Aloumi; Mohammed Siddiqui. Selective Catalytic Oxidation of Toluene to Benzaldehyde: Effect of Aging Time and Calcination Temperature Using CuxZnyO Mixed Metal Oxide Nanoparticles. Catalysts 2021, 11, 354 .
AMA StyleKhadijah Alharbi, Ali Alsalme, Ahmed Aloumi, Mohammed Siddiqui. Selective Catalytic Oxidation of Toluene to Benzaldehyde: Effect of Aging Time and Calcination Temperature Using CuxZnyO Mixed Metal Oxide Nanoparticles. Catalysts. 2021; 11 (3):354.
Chicago/Turabian StyleKhadijah Alharbi; Ali Alsalme; Ahmed Aloumi; Mohammed Siddiqui. 2021. "Selective Catalytic Oxidation of Toluene to Benzaldehyde: Effect of Aging Time and Calcination Temperature Using CuxZnyO Mixed Metal Oxide Nanoparticles." Catalysts 11, no. 3: 354.
In the present study, a simple and eco-friendly route for the synthesis of copper oxide nanoparticles (CuO NPs) using leaf extract of Phyllanthus emblica as fuel has been demonstrated, as P. emblica is a locally available abundant plant. The formation of the as-prepared CuO NPs was confirmed by using various techniques, such as UV–Vis absorption spectroscopy, cold field scanning electron microscopy (CF–SEM), energy dispersive X-ray analysis (EDX), dynamic light scattering (DLS), and X-ray photoelectron (XPS). The hydrodynamic size of the CuO NPs was found to be 80 nm, while the zeta potential of -28.6 mV was obtained. The elemental composition was confirmed by EDX analysis accompanied with elemental mapping, while the crystalline nature was substantiated by the XRD diffractogram. The as-synthesized CuO NPs were studied for their use as an adsorbent material for the removal of As(V) from water. It was confirmed that the CuO NPs effectively removed As(V) via adsorption, and the adsorption efficiency was found to be best at a higher pH. The maximum adsorption capacity of CuO for As(V) was found to be 1.17 mg/g calculated using the Langmuir equation.
Sadia Saif; Syed Adil; Mujeeb Khan; Mohammad Hatshan; Merajuddin Khan; Farzana Bashir. Adsorption Studies of Arsenic(V) by CuO Nanoparticles Synthesized by Phyllanthus emblica Leaf-Extract-Fueled Solution Combustion Synthesis. Sustainability 2021, 13, 2017 .
AMA StyleSadia Saif, Syed Adil, Mujeeb Khan, Mohammad Hatshan, Merajuddin Khan, Farzana Bashir. Adsorption Studies of Arsenic(V) by CuO Nanoparticles Synthesized by Phyllanthus emblica Leaf-Extract-Fueled Solution Combustion Synthesis. Sustainability. 2021; 13 (4):2017.
Chicago/Turabian StyleSadia Saif; Syed Adil; Mujeeb Khan; Mohammad Hatshan; Merajuddin Khan; Farzana Bashir. 2021. "Adsorption Studies of Arsenic(V) by CuO Nanoparticles Synthesized by Phyllanthus emblica Leaf-Extract-Fueled Solution Combustion Synthesis." Sustainability 13, no. 4: 2017.
The ZnO-based ternary heterostructure ZnO/Eu2O3/NiO nanoparticles are synthesized using waste curd as fuel by a simple one-pot combustion method. The as-synthesized heterostructure is characterized by using various spectroscopic and microscopic techniques including X-ray diffraction, UV–vis, FTIR, SEM, and TEM analyses. The photocatalytic activity of the ternary nanocomposite was tested for the photodegradation of methylene blue (MB) under solar light irradiation. The results have revealed that the ternary ZnO/Eu2O3/NiO photocatalyst exhibits excellent performance toward the photocatalytic degradation of the studied dye. Optimization studies revealed that the synthesized heterostructure exhibited a pH-dependent photocatalytic activity, and better results are obtained for specific concentrations of dye and catalysts. Among the different light sources employed during the study, the catalyst was found to possess the best degradation efficiency in visible light.
J. Pranesh Shubha; Syed F. Adil; Mujeeb Khan; Mohammad R. Hatshan; Aslam Khan. Facile Fabrication of a ZnO/Eu2O3/NiO-Based Ternary Heterostructure Nanophotocatalyst and Its Application for the Degradation of Methylene Blue. ACS Omega 2021, 6, 3866 -3874.
AMA StyleJ. Pranesh Shubha, Syed F. Adil, Mujeeb Khan, Mohammad R. Hatshan, Aslam Khan. Facile Fabrication of a ZnO/Eu2O3/NiO-Based Ternary Heterostructure Nanophotocatalyst and Its Application for the Degradation of Methylene Blue. ACS Omega. 2021; 6 (5):3866-3874.
Chicago/Turabian StyleJ. Pranesh Shubha; Syed F. Adil; Mujeeb Khan; Mohammad R. Hatshan; Aslam Khan. 2021. "Facile Fabrication of a ZnO/Eu2O3/NiO-Based Ternary Heterostructure Nanophotocatalyst and Its Application for the Degradation of Methylene Blue." ACS Omega 6, no. 5: 3866-3874.
In the present study, the corrosion inhibition effect of Spilanthes acmella aqueous leaves extract (SA-LE) on mild steel was investigated in 1.0 M HCl solution at different temperature using weight loss, Tafel polarization, linear polarization resistance (LPR), and electrochemical impedance (EIS) measurements. Adsorption of inhibitor on the surface of the mild steel obeyed both Langmuir and Temkin adsorption isotherms. The thermodynamic and kinetic parameters were also calculated to determine the mechanism of corrosion inhibition. The inhibition efficiency was found to increase with an increase in the inhibitor concentration i.e., Spilanthes acmella aqueous leaves extract, however, the inhibition efficiency decreased with an increase in the temperature. The phytochemical constituents with functional groups including electronegative hetero atoms such as N, O, and S in the extract adsorbed on the metal surface are found responsible for the effective performance of the inhibitor, which was confirmed by Fourier-transform infrared spectroscopy (FT-IR) and ultraviolet–visible spectroscopic (UV-Vis) studies. Protective film formation against corrosion was confirmed by scanning electron microscopy (SEM), atomic force microscopy (AFM), and contact angle studies. The result shows that the leaves extract acts as corrosion inhibitor and is able to promote surface protection by blocking active sites on the metal.
Akbar Ali Samsath Begum; Raja Mohamed Abdul Vahith; Vijay Kotra; Mohammed Rafi Shaik; Abdelatty AbdelGawad; Emad Mahrous Awwad; Mujeeb Khan. Spilanthes acmella Leaves Extract for Corrosion Inhibition in Acid Medium. Coatings 2021, 11, 106 .
AMA StyleAkbar Ali Samsath Begum, Raja Mohamed Abdul Vahith, Vijay Kotra, Mohammed Rafi Shaik, Abdelatty AbdelGawad, Emad Mahrous Awwad, Mujeeb Khan. Spilanthes acmella Leaves Extract for Corrosion Inhibition in Acid Medium. Coatings. 2021; 11 (1):106.
Chicago/Turabian StyleAkbar Ali Samsath Begum; Raja Mohamed Abdul Vahith; Vijay Kotra; Mohammed Rafi Shaik; Abdelatty AbdelGawad; Emad Mahrous Awwad; Mujeeb Khan. 2021. "Spilanthes acmella Leaves Extract for Corrosion Inhibition in Acid Medium." Coatings 11, no. 1: 106.
Degradation of organic dyes and their byproducts by heterogeneous photocatalysts is an essential process, as these dyes can be potentially discharged in wastewater and threaten aquatic and xerophyte life. Therefore, their complete mineralization into nontoxic components (water and salt) is necessary through the process of heterogeneous photocatalysis. In this study, Zr/CrO2 (Zirconium-doped chromium IV oxide) nanocomposite-based photocatalysts with different compositions (1, 3, 5, 7 & 9 wt.%) were prepared by an environmentally friendly, solid-state reaction at room temperature. The as-prepared samples were calcined under air at 450 °C in a furnace for a specific period of time. The synthesis of Zr/CrO2 photocatalysts was confirmed by various techniques, including XRD, SEM, EDX, FT-IR, UV-Vis, and BET. The photocatalytic properties of all samples were tested towards the degradation of methylene blue and methyl orange organic dyes under UV light. The results revealed a concentration-dependent photocatalytic activity of photocatalysts, which increased the amount of dopant (up to 5 wt.%). However, the degradation efficiency of the catalysts decreased upon further increasing the amount of dopant due to the recombination of holes and photoexcited electrons.
Zahir Muhammad; Farman Ali; Muhammad Sajjad; Nisar Ali; Muhammad Bilal; Mohammed Rafi Shaik; Syed Farooq Adil; Mohammed A.F. Sharaf; Emad Mahrous Awwad; Mujeeb Khan. Zirconium-Doped Chromium IV Oxide Nanocomposites: Synthesis, Characterization, and Photocatalysis towards the Degradation of Organic Dyes. Catalysts 2021, 11, 117 .
AMA StyleZahir Muhammad, Farman Ali, Muhammad Sajjad, Nisar Ali, Muhammad Bilal, Mohammed Rafi Shaik, Syed Farooq Adil, Mohammed A.F. Sharaf, Emad Mahrous Awwad, Mujeeb Khan. Zirconium-Doped Chromium IV Oxide Nanocomposites: Synthesis, Characterization, and Photocatalysis towards the Degradation of Organic Dyes. Catalysts. 2021; 11 (1):117.
Chicago/Turabian StyleZahir Muhammad; Farman Ali; Muhammad Sajjad; Nisar Ali; Muhammad Bilal; Mohammed Rafi Shaik; Syed Farooq Adil; Mohammed A.F. Sharaf; Emad Mahrous Awwad; Mujeeb Khan. 2021. "Zirconium-Doped Chromium IV Oxide Nanocomposites: Synthesis, Characterization, and Photocatalysis towards the Degradation of Organic Dyes." Catalysts 11, no. 1: 117.
Humans have witnessed three deadly pandemics so far in the twenty-first century which are associated with novel coronaviruses: SARS, Middle East respiratory syndrome (MERS), and COVID-19. All of these viruses, which are responsible for causing acute respiratory tract infections (ARTIs), are highly contagious in nature and/or have caused high mortalities. The recently emerged COVID-19 disease is a highly transmittable viral infection caused by another zoonotic novel coronavirus named severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Similar to the other two coronaviruses such as SARS-CoV-1 and MERS-CoV, SARS-CoV-2 is also likely to have originated from bats, which have been serving as established reservoirs for various pathogenic coronaviruses. Although, it is still unknown how SARS-CoV-2 is transmitted from bats to humans, the rapid human-to-human transmission has been confirmed widely. The disease first appeared in Wuhan, China, in December 2019 and quickly spread across the globe, infected 48,539,872 people, and caused 1,232,791 deaths in 215 countries, and the infection is still spreading at the time of manuscript preparation. So far, there is no definite line of treatment which has been approved or vaccine which is available. However, different types of potential vaccines and therapeutics have been evaluated and/or are under clinical trials against COVID-19. In this review, we summarize different types of acute respiratory diseases and briefly discuss earlier outbreaks of coronaviruses and compare their occurrence and pathogenicity with the current COVID-19 pandemic. Various epidemiological aspects of COVID-19 such as mode of spread, death rate, doubling time, etc., have been discussed in detail. Apart from this, different technical issues related to the COVID-19 pandemic including use of masks and other socio-economic problems associated with the pandemic have also been summarized. Additionally, we have reviewed various aspects of patient management strategies including mechanism of action, available diagnostic tools, etc., and also discussed different strategies for the development of effective vaccines and therapeutic combinations to deal with this viral outbreak. Overall, by the inclusion of various references, this review covers, in detail, the most important aspects of the COVID-19 pandemic.
Mujeeb Khan; Syed F. Adil; Hamad Z. Alkhathlan; Muhammad N. Tahir; Sadia Saif; Merajuddin Khan; Shams T. Khan. COVID-19: A Global Challenge with Old History, Epidemiology and Progress So Far. Molecules 2020, 26, 39 .
AMA StyleMujeeb Khan, Syed F. Adil, Hamad Z. Alkhathlan, Muhammad N. Tahir, Sadia Saif, Merajuddin Khan, Shams T. Khan. COVID-19: A Global Challenge with Old History, Epidemiology and Progress So Far. Molecules. 2020; 26 (1):39.
Chicago/Turabian StyleMujeeb Khan; Syed F. Adil; Hamad Z. Alkhathlan; Muhammad N. Tahir; Sadia Saif; Merajuddin Khan; Shams T. Khan. 2020. "COVID-19: A Global Challenge with Old History, Epidemiology and Progress So Far." Molecules 26, no. 1: 39.
Applications of chemical synthetic methods for the preparation of metal nanoparticles involve toxic reagents, which are hazardous to both humans and the environment. On the other hand, ecofriendly plant-based techniques offer rapid, non-toxic, and suitable alternatives to the traditional methods. Herein, we report an eco-friendly method for the preparation of silver nanoparticles (Ag NPs) using two different aqueous extracts of Zingiber officinale (ginger) and Nigella sativa L. seeds (black cumin). Successful preparation of Ag NPs was confirmed by X-ray diffraction, ultraviolet–visible (UV-Vis) spectroscopy, and energy dispersive spectroscopy (EDX). Transmission electron microscopy (TEM) analysis revealed that Nigella sativa L. seed extract (NSE) produced a smaller size of NPs (~8 nm), whereas the ginger extract (GE) led to the formation of slightly larger Ag NPs (~12 nm). In addition, to study the effect of concentration of the extract on the quality of resulting NPs, two different samples were prepared from each extract by increasing the concentrations of the extracts while using a fixed amount of precursor (AgNO3). In both cases, a high concentration of extract delivered less agglomerated and smaller-sized Ag NPs. Furthermore, the antibacterial properties of as-prepared Ag NPs were tested against different bacterial strains. Notably, despite the slightly better quality of Ag NPs obtained from NSE (NSE-Ag), NPs prepared by using GE (GE-Ag) demonstrated superior antibacterial properties. In case of the plant-extract-based synthesis of nanoparticles, it is widely reported that during the preparation, the residual phytomolecules remain on the surface of resulting NPs as stabilizing agents. Therefore, in this case, the high antibacterial properties of GE-Ag can be attributed to the contributing or synergetic effect of residual phytomolecules of GE extract on the surface of Ag NPs, since the aqueous extract of GE has been known to possess higher intrinsic bactericidal properties when compared to the aqueous NSE extract.
Alaa Alkhathlan; Hessah Al-Abdulkarim; Mujeeb Khan; Merajuddin Khan; Abdullah AlDobiy; Musaed Alkholief; Aws Alshamsan; Hamad Alkhathlan; M. Siddiqui. Ecofriendly Synthesis of Silver Nanoparticles Using Aqueous Extracts of Zingiber officinale (Ginger) and Nigella sativa L. Seeds (Black Cumin) and Comparison of Their Antibacterial Potential. Sustainability 2020, 12, 10523 .
AMA StyleAlaa Alkhathlan, Hessah Al-Abdulkarim, Mujeeb Khan, Merajuddin Khan, Abdullah AlDobiy, Musaed Alkholief, Aws Alshamsan, Hamad Alkhathlan, M. Siddiqui. Ecofriendly Synthesis of Silver Nanoparticles Using Aqueous Extracts of Zingiber officinale (Ginger) and Nigella sativa L. Seeds (Black Cumin) and Comparison of Their Antibacterial Potential. Sustainability. 2020; 12 (24):10523.
Chicago/Turabian StyleAlaa Alkhathlan; Hessah Al-Abdulkarim; Mujeeb Khan; Merajuddin Khan; Abdullah AlDobiy; Musaed Alkholief; Aws Alshamsan; Hamad Alkhathlan; M. Siddiqui. 2020. "Ecofriendly Synthesis of Silver Nanoparticles Using Aqueous Extracts of Zingiber officinale (Ginger) and Nigella sativa L. Seeds (Black Cumin) and Comparison of Their Antibacterial Potential." Sustainability 12, no. 24: 10523.
Due to their inexpensive and eco-friendly nature, and existence of manganese in various oxidation states and their natural abundance have attained significant attention for the formation of Mn3O4 nanoparticles (Mn3O4 NPs). Herein, we report the preparation of Mn3O4 nanoparticles using manganese nitrate as a precursor material by utilization of a precipitation technique. The as-prepared Mn3O4 nanoparticles (Mn3O4 NPs) were characterized by using X-ray powder diffraction (XRD), UV–Visible spectroscopy (UV–Vis), High-Resolution Transmission electron microscopy (HRTEM), Field emission scanning electron microscopy (FESEM), Thermal gravimetric analysis (TGA) and Fourier-transform infrared spectroscopy (FT-IR). The antimicrobial properties of the as-synthesized Mn3O4 nanoparticles were investigated against numerous bacterial and fungal strains including S. aureus, E. coli, B. subtilis, P. aeruginosa, A. flavus and C. albicans. The Mn3O4 NPs inhibited the growth of S. aureus with a minimum inhibitory concentration (MIC) of 40 μg/ml and C. albicans with a MIC of 15 μg/ml. Furthermore, the Mn3O4 NPs anti-cancer activity was examined using MTT essay against A549 lung and MCF-7 breast cancer cell lines. The Mn3O4 NPs revealed significant activity against the examined cancer cell lines A549 and MCF-7. The IC50 values of Mn3O4 NPs with A549 cell line was found at concentration of 98 µg/mL and MCF-7 cell line was found at concentration of 25 µg/mL.
Mohammed Rafi Shaik; Rabbani Syed; Syed Farooq Adil; Mufsir Kuniyil; Mujeeb Khan; Mohammed S. Alqahtani; Jilani P. Shaik; Mohammed Rafiq H. Siddiqui; Abdulrahman Al-Warthan; Mohammed A.F. Sharaf; Abdelatty Abdelgawad; Emad Mahrous Awwad. Mn3O4 nanoparticles: Synthesis, characterization and their antimicrobial and anticancer activity against A549 and MCF-7 cell lines. Saudi Journal of Biological Sciences 2020, 28, 1196 -1202.
AMA StyleMohammed Rafi Shaik, Rabbani Syed, Syed Farooq Adil, Mufsir Kuniyil, Mujeeb Khan, Mohammed S. Alqahtani, Jilani P. Shaik, Mohammed Rafiq H. Siddiqui, Abdulrahman Al-Warthan, Mohammed A.F. Sharaf, Abdelatty Abdelgawad, Emad Mahrous Awwad. Mn3O4 nanoparticles: Synthesis, characterization and their antimicrobial and anticancer activity against A549 and MCF-7 cell lines. Saudi Journal of Biological Sciences. 2020; 28 (2):1196-1202.
Chicago/Turabian StyleMohammed Rafi Shaik; Rabbani Syed; Syed Farooq Adil; Mufsir Kuniyil; Mujeeb Khan; Mohammed S. Alqahtani; Jilani P. Shaik; Mohammed Rafiq H. Siddiqui; Abdulrahman Al-Warthan; Mohammed A.F. Sharaf; Abdelatty Abdelgawad; Emad Mahrous Awwad. 2020. "Mn3O4 nanoparticles: Synthesis, characterization and their antimicrobial and anticancer activity against A549 and MCF-7 cell lines." Saudi Journal of Biological Sciences 28, no. 2: 1196-1202.
Citronellol is one of the most widely used fragrances for bouquetting purposes and it is a starting material for synthesis of several other terpenoids. Nevertheless, few data have been reported on citronellol selective oxidation. Accordingly, we report our findings on the selective oxidation of citronellol with hydrogen peroxide using a set of titanosilicate catalysts with different morphologies and textural properties—conventional titanium silicalite 1 (TS-1), mesoporous TS-1, layered TS-1 and silica-titania pillared TS-1 and also studying the effect of the solvent used. Epoxidation of C6=C7 double bond was the main primary reaction in this system and trace signals of C5 allylic oxidation products were observed without formation of citronellal. Due to the presence of post-synthesis introduced additional Ti sites, the silica-titania pillared TS-1 (TS-1-PITi) provided the highest conversion among the tested catalysts; nevertheless, citronellol was oxidized over all the studied catalysts including conventional TS-1; therefore, showing that it penetrates even into MFI micropores (0.55 nm in diameter). When using acetonitrile as a solvent, the conversion was proportional to the titanium content of the catalyst. When studying the effect of the solvent, acetonitrile provided the highest epoxide selectivity (55%) while in methanol, 2-propanol and 1,4-dioxane, ring opening reactions caused epoxide decomposition.
Daifallah Aldhayan; Květa Kalíková; Mohammed Rafi Shaik; Mohammed Rafiq H. Siddiqui; Jan Přech. Selective Oxidation of Citronellol over Titanosilicate Catalysts. Catalysts 2020, 10, 1284 .
AMA StyleDaifallah Aldhayan, Květa Kalíková, Mohammed Rafi Shaik, Mohammed Rafiq H. Siddiqui, Jan Přech. Selective Oxidation of Citronellol over Titanosilicate Catalysts. Catalysts. 2020; 10 (11):1284.
Chicago/Turabian StyleDaifallah Aldhayan; Květa Kalíková; Mohammed Rafi Shaik; Mohammed Rafiq H. Siddiqui; Jan Přech. 2020. "Selective Oxidation of Citronellol over Titanosilicate Catalysts." Catalysts 10, no. 11: 1284.
The newly synthesized dinuclear uranyl salen coordination compound showed excellent photocatalytic reduction of CO2 to methanol.
Mohammad Azam; Umesh Kumar; Joshua O. Olowoyo; Saud I. Al-Resayes; Agata Trzesowska-Kruszynska; Rafal Kruszynski; Mohammadd Shahidul Islam; Mohammad Rizwan Khan; Syed Farooq Adil; Mohammad Rafique Siddiqui; Fahad Ahmed Al-Harthi; Abdul Karim Alinzi; Saikh Mohammad Wabaidur; Masoom Raza Siddiqui; Mohammed Rafi Shaik; Suman L. Jain; M. Amin Farkhondehfal; Simelys Hernàndez. Dinuclear uranium(vi) salen coordination compound: an efficient visible-light-active catalyst for selective reduction of CO2 to methanol. Dalton Transactions 2020, 49, 17243 -17251.
AMA StyleMohammad Azam, Umesh Kumar, Joshua O. Olowoyo, Saud I. Al-Resayes, Agata Trzesowska-Kruszynska, Rafal Kruszynski, Mohammadd Shahidul Islam, Mohammad Rizwan Khan, Syed Farooq Adil, Mohammad Rafique Siddiqui, Fahad Ahmed Al-Harthi, Abdul Karim Alinzi, Saikh Mohammad Wabaidur, Masoom Raza Siddiqui, Mohammed Rafi Shaik, Suman L. Jain, M. Amin Farkhondehfal, Simelys Hernàndez. Dinuclear uranium(vi) salen coordination compound: an efficient visible-light-active catalyst for selective reduction of CO2 to methanol. Dalton Transactions. 2020; 49 (47):17243-17251.
Chicago/Turabian StyleMohammad Azam; Umesh Kumar; Joshua O. Olowoyo; Saud I. Al-Resayes; Agata Trzesowska-Kruszynska; Rafal Kruszynski; Mohammadd Shahidul Islam; Mohammad Rizwan Khan; Syed Farooq Adil; Mohammad Rafique Siddiqui; Fahad Ahmed Al-Harthi; Abdul Karim Alinzi; Saikh Mohammad Wabaidur; Masoom Raza Siddiqui; Mohammed Rafi Shaik; Suman L. Jain; M. Amin Farkhondehfal; Simelys Hernàndez. 2020. "Dinuclear uranium(vi) salen coordination compound: an efficient visible-light-active catalyst for selective reduction of CO2 to methanol." Dalton Transactions 49, no. 47: 17243-17251.
Catalysts of 10% Ni, supported on promoted alumina, were used to accomplish the partial oxidation of methane. The alumina support was doped with oxides of Mo, Mg, Ti and Y. An incipient wetness impregnation technique was used to synthesize the catalysts. The physicochemical properties of the catalysts were described by XRD, H2-TPR (temperature programmed reduction), BET, TGA, CO2-TPD (temperature-programmed desorption) and Raman. The characterization results denoted that Ni has a strong interaction with the support. The TGA investigation of spent catalysts displayed the anticoking enhancement of the promoters. The impact of the support promoters on the catalyst stability, methane conversion and H2 yield was inspected. Stability tests were done for 460 min. The H2 yields were 76 and 60% and the CH4 conversions were 67 and 92%, respectively, over Ni/Al2O3+Mg, when the reaction temperatures were 550 and 650 °C, respectively. The performance of the present work was compared to relevant findings in the literature.
Ahmed A. Ibrahim; Wasim U. Khan; Fahad Al-Mubaddel; Ahmed S. Al-Fatesh; Samsudeen O. Kasim; Sofiu L. Mahmud; Ateyah A. Al-Zahrani; M. Rafiq H. Siddiqui; Anis H. Fakeeha. Study of Partial Oxidation of Methane by Ni/Al2O3 Catalyst: Effect of Support Oxides of Mg, Mo, Ti and Y as Promoters. Molecules 2020, 25, 5029 .
AMA StyleAhmed A. Ibrahim, Wasim U. Khan, Fahad Al-Mubaddel, Ahmed S. Al-Fatesh, Samsudeen O. Kasim, Sofiu L. Mahmud, Ateyah A. Al-Zahrani, M. Rafiq H. Siddiqui, Anis H. Fakeeha. Study of Partial Oxidation of Methane by Ni/Al2O3 Catalyst: Effect of Support Oxides of Mg, Mo, Ti and Y as Promoters. Molecules. 2020; 25 (21):5029.
Chicago/Turabian StyleAhmed A. Ibrahim; Wasim U. Khan; Fahad Al-Mubaddel; Ahmed S. Al-Fatesh; Samsudeen O. Kasim; Sofiu L. Mahmud; Ateyah A. Al-Zahrani; M. Rafiq H. Siddiqui; Anis H. Fakeeha. 2020. "Study of Partial Oxidation of Methane by Ni/Al2O3 Catalyst: Effect of Support Oxides of Mg, Mo, Ti and Y as Promoters." Molecules 25, no. 21: 5029.
In recent years, the development of green mechanochemical processes for the synthesis of new catalysts with higher catalytic efficacy and selectivity has received manifest interest. In continuation of our previous study, in which graphene oxide (GRO) and highly reduced graphene oxide (HRG) based nanocomposites were prepared and assessed, herein, we have explored a facile and solvent-less mechanochemical approach for the synthesis of N-doped graphene (NDG)/mixed metal oxide (MnCO3–ZrO2) ((X%)NDG/MnCO3–ZrO2), as the (X%)NDG/MnCO3–ZrO2 nano-composite was synthesized using physical grinding of separately synthesized NDG and pre-calcined (300 °C) MnCO3–ZrO2 via green milling method. The structures of the prepared materials were characterized in detail using X-ray powder diffraction (XRD), Field Emission Scanning Electron Microscope (FESEM), Energy Dispersive X-Ray Analysis (EDX), Fourier-transform infrared spectroscopy (FTIR), Raman, Thermogravimetric analysis (TGA), and N2 adsorption-desorption isotherm analysis. Besides, the obtained nanocomposites were employed as heterogeneous oxidation catalyst for the alcohol oxidation using green oxidant O2 without involving any surfactants or bases. The reaction factors were systematically studied during the oxidation of benzyl alcohol (PhCH2OH) as the model reactant to benzaldehyde (PhCHO). The NDG/MnCO3–ZrO2 exhibits premium specific activity (66.7 mmol·g−1·h−1) with 100% conversion of PhCH2OH and > 99.9% selectivity to PhCHO after only 6 min. The mechanochemically prepared NDG based nanocomposite exhibited notable improvement in the catalytic efficacy as well as the surface area compared to the pristine MnCO3–ZrO2. Under the optimal circumstances, the NDG/MnCO3–ZrO2 catalyst could selectively catalyze the aerobic oxidation of a broad array of alcohols to carbonyls with full convertibility without over-oxidized side products like acids. The NDG/MnCO3–ZrO2 catalyst were efficiently reused for six subsequent recycling reactions with a marginal decline in performance and selectivity.
Mufsir Kuniyil; J. V. Shanmukha Kumar; Syed Farooq Adil; Mohamed E. Assal; Mohammed Rafi Shaik; Mujeeb Khan; Abdulrahman Al-Warthan; Mohammed Rafiq H. Siddiqui; Aslam Khan; Muhammad Bilal; Hafiz M. N. Iqbal; Waheed A. Al-Masry. Eco-Friendly and Solvent-Less Mechanochemical Synthesis of ZrO2–MnCO3/N-Doped Graphene Nanocomposites: A Highly Efficacious Catalyst for Base-Free Aerobic Oxidation of Various Types of Alcohols. Catalysts 2020, 10, 1136 .
AMA StyleMufsir Kuniyil, J. V. Shanmukha Kumar, Syed Farooq Adil, Mohamed E. Assal, Mohammed Rafi Shaik, Mujeeb Khan, Abdulrahman Al-Warthan, Mohammed Rafiq H. Siddiqui, Aslam Khan, Muhammad Bilal, Hafiz M. N. Iqbal, Waheed A. Al-Masry. Eco-Friendly and Solvent-Less Mechanochemical Synthesis of ZrO2–MnCO3/N-Doped Graphene Nanocomposites: A Highly Efficacious Catalyst for Base-Free Aerobic Oxidation of Various Types of Alcohols. Catalysts. 2020; 10 (10):1136.
Chicago/Turabian StyleMufsir Kuniyil; J. V. Shanmukha Kumar; Syed Farooq Adil; Mohamed E. Assal; Mohammed Rafi Shaik; Mujeeb Khan; Abdulrahman Al-Warthan; Mohammed Rafiq H. Siddiqui; Aslam Khan; Muhammad Bilal; Hafiz M. N. Iqbal; Waheed A. Al-Masry. 2020. "Eco-Friendly and Solvent-Less Mechanochemical Synthesis of ZrO2–MnCO3/N-Doped Graphene Nanocomposites: A Highly Efficacious Catalyst for Base-Free Aerobic Oxidation of Various Types of Alcohols." Catalysts 10, no. 10: 1136.