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Abdulrahman I. Alharthi
Department of Chemistry, College of Science and Humanities, Prince Sattam Bin Abdulaziz University, P.O. Box 173, Al-Kharj, 11942, Saudi Arabia

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Journal article
Published: 23 June 2021 in Catalysts
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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.

ACS Style

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 Style

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 (7):760.

Chicago/Turabian Style

Mujeeb 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.

Journal article
Published: 23 June 2021 in Ceramics International
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The Cobalt ferrite (CoFe2O4) and cobalt ferrite incorporated with Cu (Cu–CoFe2O4) and Mg (Mg–CoFe2O4) have been synthesized by wet chemical route. In fixed-bed reactor, the CoFe2O4, Cu–CoFe2O4 and Mg–CoFe2O4 were used as catalysts for direct cracking of methane at temperature of 800 °C and 20 mL/min of feed gas flow rate for hydrogen and nano-carbon production. Different characterizations techniques namely XRD, FESEM, XPS, Raman spectroscopy, TGA, BET for fresh and spent catalysts have been executed. The X-ray powder diffraction and Raman spectra confirmed that the fresh catalysts possess a cubic spinel crystal structure. The FESEM images for spent catalysts displayed that filamentous carbons were not formed over catalysts surfaces except a few amount was observed over the spent CoFe2O4 catalyst. XPS results confirmed the purity of the synthesized catalysts and qualitatively evaluate the cation distribution between the tetrahedral and octahedral sites from Co 2p3/2 and Fe 2p3/2 spectra. BET surface area revealed no significant effects in surface area and pore size of CoFe2O4 catalyst by incorporation of Mg and Cu metals. Activity studies showed that incorporation Mg metal on CoFe2O4 improved methane conversion up to 40.03% and hydrogen formation rate of 79.90 mol H2 g−1 min−1 as compared to 31.61% and 66 mol H2 g−1 min−1 for CoFe2O4 catalyst. Whilst, Cu metal incorporation in CoFe2O4 catalyst led to decline the catalyst performance. Structure activity relationship was described in details.

ACS Style

Abdulrahman I. Alharthi; Mshari A. Alotaibi; Israf Ud Din; E. Abdel-Fattah; Afroz Bakht; Ahmed Sadeq Al-Fatesh; Abdulaziz A. Alanazi. Mg and Cu incorporated CoFe2O4 catalyst: characterization and methane cracking performance for hydrogen and nano-carbon production. Ceramics International 2021, 47, 27201 -27209.

AMA Style

Abdulrahman I. Alharthi, Mshari A. Alotaibi, Israf Ud Din, E. Abdel-Fattah, Afroz Bakht, Ahmed Sadeq Al-Fatesh, Abdulaziz A. Alanazi. Mg and Cu incorporated CoFe2O4 catalyst: characterization and methane cracking performance for hydrogen and nano-carbon production. Ceramics International. 2021; 47 (19):27201-27209.

Chicago/Turabian Style

Abdulrahman I. Alharthi; Mshari A. Alotaibi; Israf Ud Din; E. Abdel-Fattah; Afroz Bakht; Ahmed Sadeq Al-Fatesh; Abdulaziz A. Alanazi. 2021. "Mg and Cu incorporated CoFe2O4 catalyst: characterization and methane cracking performance for hydrogen and nano-carbon production." Ceramics International 47, no. 19: 27201-27209.

Journal article
Published: 11 June 2021 in Materials
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Cobalt (Co) doped zinc oxide (ZnO) microcrystals (MCs) are prepared by using the hydrothermal method from the precursor’s mixture of zinc chloride (ZnCl2), cobalt-II chloride hexahydrate (CoCl2·6H2O), and potassium hydroxide (KOH). The smooth round cylindrical morphologies of the synthesized microcrystals of Co-doped ZnO show an increase in absorption with the cobalt doping. The antibacterial activity of the as-obtained Co-doped ZnO-MCs was tested against the bacterial strains of gram-negative (Escherichia coli, Klebsiella pneumonia) and gram-positive bacteria (Staphylococcus aureus, Streptococcus pyogenes) via the agar well diffusion method. The zones of inhibition (ZOI) for Co-doped ZnO-MCs against E. coli and K. pneumoniae were found to be 17 and 19 mm, and 15 and 16 mm against S. Aureus and S. pyogenes, respectively. The prepared Co-doped ZnO-MCs were thus established as a probable antibacterial agent against gram-negative bacterial strains.

ACS Style

Awais Khalid; Pervaiz Ahmad; Abdulrahman Alharthi; Saleh Muhammad; Mayeen Khandaker; Mohammad Faruque; Abdulhameed Khan; Israf Din; Mshari Alotaibi; Khalid Alzimami; Abdulrahman Alfuraih; David Bradley. Enhanced Optical and Antibacterial Activity of Hydrothermally Synthesized Cobalt-Doped Zinc Oxide Cylindrical Microcrystals. Materials 2021, 14, 3223 .

AMA Style

Awais Khalid, Pervaiz Ahmad, Abdulrahman Alharthi, Saleh Muhammad, Mayeen Khandaker, Mohammad Faruque, Abdulhameed Khan, Israf Din, Mshari Alotaibi, Khalid Alzimami, Abdulrahman Alfuraih, David Bradley. Enhanced Optical and Antibacterial Activity of Hydrothermally Synthesized Cobalt-Doped Zinc Oxide Cylindrical Microcrystals. Materials. 2021; 14 (12):3223.

Chicago/Turabian Style

Awais Khalid; Pervaiz Ahmad; Abdulrahman Alharthi; Saleh Muhammad; Mayeen Khandaker; Mohammad Faruque; Abdulhameed Khan; Israf Din; Mshari Alotaibi; Khalid Alzimami; Abdulrahman Alfuraih; David Bradley. 2021. "Enhanced Optical and Antibacterial Activity of Hydrothermally Synthesized Cobalt-Doped Zinc Oxide Cylindrical Microcrystals." Materials 14, no. 12: 3223.

Journal article
Published: 10 February 2021 in Nanomaterials
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Copper oxide and Zinc (Zn)-doped Copper oxide nanostructures (CuO-NSs) are successfully synthesized by using a hydrothermal technique. The as-obtained pure and Zn-doped CuO-NSs were tested to study the effect of doping in CuO on structural, optical, and antibacterial properties. The band gap of the nanostructures is calculated by using the Tauc plot. Our results have shown that the band gap of CuO reduces with the addition of Zinc. Optimization of processing conditions and concentration of precursors leads to the formation of pine needles and sea urchin-like nanostructures. The antibacterial properties of obtained Zn-doped CuO-NSs are observed against Gram-negative ( Pseudomonas aeruginosa, Klebsiella pneumonia, Escherichia coli) and Gram-positive ( Staphylococcus aureus) bacteria via the agar well diffusion method. Zn doped s are found to have more effective bacterial resistance than pure CuO. The improved antibacterial activity is attributed to the reactive oxygen species (ROS) generation.

ACS Style

Awais Khalid; Pervaiz Ahmad; Abdulrahman I. Alharthi; Saleh Muhammad; Mayeen Uddin Khandaker; Mubasher Rehman; Mohammad Rashed Iqbal Faruque; Israf Ud Din; Mshari A. Alotaibi; Khalid Alzimami; David A. Bradley. Structural, Optical and Antibacterial Efficacy of Pure and Zinc-Doped Copper Oxide against Pathogenic Bacteria. Nanomaterials 2021, 11, 451 .

AMA Style

Awais Khalid, Pervaiz Ahmad, Abdulrahman I. Alharthi, Saleh Muhammad, Mayeen Uddin Khandaker, Mubasher Rehman, Mohammad Rashed Iqbal Faruque, Israf Ud Din, Mshari A. Alotaibi, Khalid Alzimami, David A. Bradley. Structural, Optical and Antibacterial Efficacy of Pure and Zinc-Doped Copper Oxide against Pathogenic Bacteria. Nanomaterials. 2021; 11 (2):451.

Chicago/Turabian Style

Awais Khalid; Pervaiz Ahmad; Abdulrahman I. Alharthi; Saleh Muhammad; Mayeen Uddin Khandaker; Mubasher Rehman; Mohammad Rashed Iqbal Faruque; Israf Ud Din; Mshari A. Alotaibi; Khalid Alzimami; David A. Bradley. 2021. "Structural, Optical and Antibacterial Efficacy of Pure and Zinc-Doped Copper Oxide against Pathogenic Bacteria." Nanomaterials 11, no. 2: 451.

Journal article
Published: 19 May 2020 in Catalysts
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Ongoing industrialization has deteriorated the global environment. Global warming is a human-induced issue affecting the environment. The alarming increase in CO2 emissions is among the major contributors to global warming. The conversion of CO2 to methanol is an economically viable and environmentally friendly solution to mitigate its concentration. Here, hydrogenation of CO2 was studied over carbon nanofiber-based Cu/ZrO2 catalysts. Kinetics investigations were carried out for the reaction. Overall, kinetics data indicated that CO2 conversion follows a pseudo-first-order reaction. The kinetics studies were further modeled by using an artificial neural network, which supported the experimental kinetics study.

ACS Style

Israf Ud Din; Maizatul S. Shaharun; Abdul Naeem; Mshari A. Alotaibi; Abdulrahman I. Alharthi; Qazi Nasir. CO2 Conversion to Methanol over Novel Carbon Nanofiber-Based Cu/ZrO2 Catalysts—A Kinetics Study. Catalysts 2020, 10, 567 .

AMA Style

Israf Ud Din, Maizatul S. Shaharun, Abdul Naeem, Mshari A. Alotaibi, Abdulrahman I. Alharthi, Qazi Nasir. CO2 Conversion to Methanol over Novel Carbon Nanofiber-Based Cu/ZrO2 Catalysts—A Kinetics Study. Catalysts. 2020; 10 (5):567.

Chicago/Turabian Style

Israf Ud Din; Maizatul S. Shaharun; Abdul Naeem; Mshari A. Alotaibi; Abdulrahman I. Alharthi; Qazi Nasir. 2020. "CO2 Conversion to Methanol over Novel Carbon Nanofiber-Based Cu/ZrO2 Catalysts—A Kinetics Study." Catalysts 10, no. 5: 567.

Journal article
Published: 22 May 2019 in Catalysts
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Ni supported on bare and modified ZrO2 samples were synthesized using the incipient wet impregnation method. The t-ZrO2 phase was stabilized by incorporation of La2O3 into ZrO2. Moreover, the influence of CeO2-doping on the physico-chemical and catalytic properties under CO2 reforming conditions was probed. The characterization data of the investigated catalysts were obtained by using XRD, CO2/H2-TPD, BET, TPR, TPO, TGA, XPS and TEM characterization techniques. In the pristine Ni/Zr catalyst, the t-ZrO2 phase transformed into the monoclinic phase. However, upon support modification by La2O3, significant effects on the physicochemical properties were observed due to the monoclinic-to-tetragonal ZrO2 phase transformation also affecting the catalytic activity. As a result, superior activity on the La2O3 modified Ni/Zr catalyst was achieved, while no relevant change in the surface properties and activity of the catalysts was detected after doping by CeO2. The peculiar behavior of the Ni/La-ZrO2 sample was related to higher dispersion of the active phase, with a more pronounced stabilization of the t-ZrO2 phase.

ACS Style

Ahmed Sadeq Al-Fatesh; Yasir Arafat; Ahmed Aidid Ibrahim; Samsudeen Olajide Kasim; Abdulrahman Alharthi; Anis Hamza Fakeeha; Ahmed Elhag Abasaeed; Giuseppe Bonura; Francesco Frusteri. Catalytic Behaviour of Ce-Doped Ni Systems Supported on Stabilized Zirconia under Dry Reforming Conditions. Catalysts 2019, 9, 473 .

AMA Style

Ahmed Sadeq Al-Fatesh, Yasir Arafat, Ahmed Aidid Ibrahim, Samsudeen Olajide Kasim, Abdulrahman Alharthi, Anis Hamza Fakeeha, Ahmed Elhag Abasaeed, Giuseppe Bonura, Francesco Frusteri. Catalytic Behaviour of Ce-Doped Ni Systems Supported on Stabilized Zirconia under Dry Reforming Conditions. Catalysts. 2019; 9 (5):473.

Chicago/Turabian Style

Ahmed Sadeq Al-Fatesh; Yasir Arafat; Ahmed Aidid Ibrahim; Samsudeen Olajide Kasim; Abdulrahman Alharthi; Anis Hamza Fakeeha; Ahmed Elhag Abasaeed; Giuseppe Bonura; Francesco Frusteri. 2019. "Catalytic Behaviour of Ce-Doped Ni Systems Supported on Stabilized Zirconia under Dry Reforming Conditions." Catalysts 9, no. 5: 473.