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Chromium oxide supported on mesoporous organo-silica (MOS) was synthesized with different Cr loading by an incipient method. The catalytic performance of a Cr(x)/MOS catalyst for CO2-based ethane dehydrogenation was investigated. The synthesized catalysts were characterized by XRD, BET, TEM, SEM, XPS, FTIR, and UV–Vis DR measurements. The textural properties of the prepared samples showed that the mesoporous nature of MOS sample was not disturbed by chromium impregnation. Among the prepared samples, Cr(8)/MOS catalyst exhibited good distribution of chromium species along with superior concentration of Cr6+ and the highest recorded Cr6+/Cr3+ ratio. The results revealed that the superior catalytic performance was reached at Cr(8)/MOS, with 50.4% and 90.1% of ethane conversion and ethylene selectivity, respectively. The catalytic activity decreased slowly over reaction time; it declined approximately 22% after 10 h of stream operation. The roles of CO2-based ethane dehydrogenation were also studied, where carbon dioxide can be a source of lattice oxygen and as a hydrogen consumer in reverse water–gas shift (RWGS) reaction. The effect of various catalytic factors, such as catalytic temperature, reaction time, space gas velocity, and CO2 partial pressure on the conversion of ethane, yield, and selectivity to ethylene, were investigated as well.
Abdulrhman Al-Awadi; Ahmed El-Toni; Joselito Labis; Aslam Khan; Hamid Ghaithan; Attiyah Al-Zahrani; Ahmed Abasaeed; Saeed Al-Zahrani. Mesoporous Organo-Silica Supported Chromium Oxide Catalyst for Oxidative Dehydrogenation of Ethane to Ethylene with CO2. Catalysts 2021, 11, 642 .
AMA StyleAbdulrhman Al-Awadi, Ahmed El-Toni, Joselito Labis, Aslam Khan, Hamid Ghaithan, Attiyah Al-Zahrani, Ahmed Abasaeed, Saeed Al-Zahrani. Mesoporous Organo-Silica Supported Chromium Oxide Catalyst for Oxidative Dehydrogenation of Ethane to Ethylene with CO2. Catalysts. 2021; 11 (5):642.
Chicago/Turabian StyleAbdulrhman Al-Awadi; Ahmed El-Toni; Joselito Labis; Aslam Khan; Hamid Ghaithan; Attiyah Al-Zahrani; Ahmed Abasaeed; Saeed Al-Zahrani. 2021. "Mesoporous Organo-Silica Supported Chromium Oxide Catalyst for Oxidative Dehydrogenation of Ethane to Ethylene with CO2." Catalysts 11, no. 5: 642.
A single-step solvothermal approach to prepare stabilized cubic zirconia (ZrO2) nanoparticles (NPs) and highly reduced graphene oxide (HRG) and ZrO2 nanocomposite ([email protected]) using benzyl alcohol as a solvent and stabilizing ligand is presented. The as-prepared ZrO2 NPs and the [email protected] nanocomposite were characterized using transmission electron microscopy (TEM) and X-ray diffraction (XRD), which confirmed the formation of ultra-small, cubic phase ZrO2 NPs with particle sizes of ~2 nm in both reactions. Slight variation of reaction conditions, including temperature and amount of benzyl alcohol, significantly affected the size of resulting NPs. The presence of benzyl alcohol as a stabilizing agent on the surface of ZrO2 NPs was confirmed using various techniques such as ultraviolet-visible (UV-vis), Fourier-transform infrared (FT-IR), Raman and XPS spectroscopies and thermogravimetric analysis (TGA). Furthermore, a comparative electrochemical study of both as-prepared ZrO2 NPs and the [email protected] nanocomposites is reported. The [email protected] nanocomposite confirms electronic interactions between ZrO2 and HRG when compared their electrochemical studies with pure ZrO2 and HRG using cyclic voltammetry (CV).
Mohammed Rafi Shaik; Manawwer Alam; Syed Farooq Adil; Mufsir Kuniyil; Abdulrahman Al-Warthan; Mohammed Rafiq H Siddiqui; Muhammad Nawaz Tahir; Joselito P. Labis; Mujeeb Khan. Solvothermal Preparation and Electrochemical Characterization of Cubic ZrO2 Nanoparticles/Highly Reduced Graphene (HRG) based Nanocomposites. Materials 2019, 12, 711 .
AMA StyleMohammed Rafi Shaik, Manawwer Alam, Syed Farooq Adil, Mufsir Kuniyil, Abdulrahman Al-Warthan, Mohammed Rafiq H Siddiqui, Muhammad Nawaz Tahir, Joselito P. Labis, Mujeeb Khan. Solvothermal Preparation and Electrochemical Characterization of Cubic ZrO2 Nanoparticles/Highly Reduced Graphene (HRG) based Nanocomposites. Materials. 2019; 12 (5):711.
Chicago/Turabian StyleMohammed Rafi Shaik; Manawwer Alam; Syed Farooq Adil; Mufsir Kuniyil; Abdulrahman Al-Warthan; Mohammed Rafiq H Siddiqui; Muhammad Nawaz Tahir; Joselito P. Labis; Mujeeb Khan. 2019. "Solvothermal Preparation and Electrochemical Characterization of Cubic ZrO2 Nanoparticles/Highly Reduced Graphene (HRG) based Nanocomposites." Materials 12, no. 5: 711.
The development of visible‐light photocatalysts with desirable material characteristics and efficient performance is an existing challenge for photocatalysis community. Herein, we report on the synthesis of silver nanoparticles (AgNPs) modified porous silicon (PSi) nanopowder and its effective use in the photo‐reduction of hexavalent chromium Cr(VI) to trivalent Cr(III) under direct visible light irradiation in the presence of citric acid. The PSi was prepared via simple stain etching of Si microparticles in HF/HNO3 aqueous solution, followed by the deposition of AgNPs onto PSi by the immersion plating technique. The developed photocatalyst composed of PSi with <20 nm mesoporous structure, decorated with crystalline 15‐50 nm AgNPs. Photocatalytic experiments using unmodified Si microparticles, either PSi or sonicated one, indicated inactive catalytic behavior towards the photo‐reduction of Cr(VI). Remarkable photo‐reduction efficiency (97.4%) was achieved after 180 min irradiation using the AgNPs/PSi sample. The efficient photo‐reduction capability of AgNPs/PSi photocatalyst is attributed to the enhanced separation between photo‐generated electrons and holes (e–‐h+) enabling better utilization of light, as revealed from the photoluminescence measurement. Additionally, the presence of citric acid in solution promoted greatly the photo‐reduction reaction as it acted as a hole scavenger, suppressing further the rate of e–‐h+ recombination through rapidly consumption of photo‐generated holes. Excellent reusability of the current photocatalyst was evidenced by performing cyclic five runs with minimal reactivity loss. Results of synthesis, characterization, photocatalytic activity and reaction mechanism are thoroughly addressed and discussed. This article is protected by copyright. All rights reserved.
Mohd Faisal; Farid A. Harraz; Ali E. Al‐Salami; Ahmed Mohamed El‐Toni; Abdulrhman A. Almadiy; Aslam Khan; Joselito P. Labis; Saleh A. Al‐Sayari; Mohammad S. Al-Assiri. Enhanced photocatalytic reduction of Cr(VI) on silver nanoparticles modified mesoporous silicon under visible light. Journal of the American Ceramic Society 2019, 102, 5071 -5081.
AMA StyleMohd Faisal, Farid A. Harraz, Ali E. Al‐Salami, Ahmed Mohamed El‐Toni, Abdulrhman A. Almadiy, Aslam Khan, Joselito P. Labis, Saleh A. Al‐Sayari, Mohammad S. Al-Assiri. Enhanced photocatalytic reduction of Cr(VI) on silver nanoparticles modified mesoporous silicon under visible light. Journal of the American Ceramic Society. 2019; 102 (9):5071-5081.
Chicago/Turabian StyleMohd Faisal; Farid A. Harraz; Ali E. Al‐Salami; Ahmed Mohamed El‐Toni; Abdulrhman A. Almadiy; Aslam Khan; Joselito P. Labis; Saleh A. Al‐Sayari; Mohammad S. Al-Assiri. 2019. "Enhanced photocatalytic reduction of Cr(VI) on silver nanoparticles modified mesoporous silicon under visible light." Journal of the American Ceramic Society 102, no. 9: 5071-5081.
In this study, pulsed laser ablation technique, also known as pulsed laser deposition (PLD), is used to design and grow ZnO nanostructures (nanoworms, nanowalls, and nanorods) by template/seeding approach for gas‐sensing applications. Conventionally, ZnO nanostructures used for gas sensing have been usually prepared via chemical route, where the 3D/2D nanostructures are chemically synthesized and subsequently plated on an appropriate substrate. However, using pulsed laser ablation technique, the ZnO nanostructures are structurally designed and grown directly on a substrate using a two‐step temperature‐pressure seeding approach. This approach has been optimized to design various ZnO nanostructures by understanding the effect of substrate temperature in the 300 ‐ 750°C range under O2 gas pressure from 10‐milli to 10 Torr. Using a thin ZnO seed layer as template that is deposited first at substrate temperature of ~300°C at background oxygen pressure of 10 mTorr on Si(100), ZnO nanostructures, such as nanoworms, nanowalls, and nanorods (with secondary flower‐like growth) were grown at substrate temperatures and oxygen background pressures of (550°C and 2 Torr), (550°C and 0.5 Torr) and (650°C and 2 Torr), respectively. The morphology and the optical properties of ZnO nanostructures were examined by Scanning Electron Microscope (SEM‐EDX), X‐ray Diffraction (XRD), and Photoluminescence (PL). The PLD‐grown ZnO nanostructures are single‐crystals and are highly‐oriented in the c‐axis. The vapor‐solid (VS) model is proposed to be responsible for the growth of ZnO nanostructures by PLD process. Further, the ZnO nanowall structure is a very promising nanostructure due to its very high surface‐to‐volume ratio. Although ZnO nanowalls have been grown by other methods for sensor application, to this date, only a very few ZnO nanowalls have been grown by PLD for this purpose. In this regard, ZnO nanowall structures are deposited by PLD on an Al2O3 test sensor and assessed for their responses to CO and ethanol gases at 50 ppm, where good responses were observed respectively at 350 and 400 °C. The PLD‐grown ZnO nanostructures are very excellent materials for potential applications such as in dye‐sensitized solar cells, perovskite solar cells and biological and gas sensors. This article is protected by copyright. All rights reserved.
Joselito P. Labis; Anwar Q. Al‐Anazi; Hamad A. Al‐Brithen; Mahmoud Hezam; Mohammad AbdulAziz Alduraibi; Ahmad Al‐Garni; Abdulaziz A. Al‐Harbi; Abdulrhman S. Al‐Awadi; Aslam Khan; Ahmed Mohamed El‐Toni. Designing zinc oxide nanostructures (nanoworms, nanoflowers, nanowalls, and nanorods) by pulsed laser ablation technique for gas‐sensing application. Journal of the American Ceramic Society 2018, 102, 4367 -4375.
AMA StyleJoselito P. Labis, Anwar Q. Al‐Anazi, Hamad A. Al‐Brithen, Mahmoud Hezam, Mohammad AbdulAziz Alduraibi, Ahmad Al‐Garni, Abdulaziz A. Al‐Harbi, Abdulrhman S. Al‐Awadi, Aslam Khan, Ahmed Mohamed El‐Toni. Designing zinc oxide nanostructures (nanoworms, nanoflowers, nanowalls, and nanorods) by pulsed laser ablation technique for gas‐sensing application. Journal of the American Ceramic Society. 2018; 102 (7):4367-4375.
Chicago/Turabian StyleJoselito P. Labis; Anwar Q. Al‐Anazi; Hamad A. Al‐Brithen; Mahmoud Hezam; Mohammad AbdulAziz Alduraibi; Ahmad Al‐Garni; Abdulaziz A. Al‐Harbi; Abdulrhman S. Al‐Awadi; Aslam Khan; Ahmed Mohamed El‐Toni. 2018. "Designing zinc oxide nanostructures (nanoworms, nanoflowers, nanowalls, and nanorods) by pulsed laser ablation technique for gas‐sensing application." Journal of the American Ceramic Society 102, no. 7: 4367-4375.
Magnetic nanoparticles are used in adsorptive removal of heavy metals from polluted wastewater. However, their poor stability in an acidic medium necessitates their protection with a coating layer. Coating magnetic nanoparticles with carbon showed proper protection but the heavy metal removal efficiency was slightly weak. However, to boost the removal efficiencies of surface functionalization, polyacrylamide was applied to carbon-coated Fe3O4 nanoparticles. In this paper, to facilitate the synthesis process, one-step carbon coating and polyacrylamide functionalization were conducted using the hydrothermal technique with the aim of enhancing the adsorptive removal capacity of Fe3O4 nanoparticles towards some heavy metals such as Cu(II), Ni(II), Co(II), and Cd(II). The results showed that the one-step process succeeded in developing a carbon coating layer and polyacrylamide functionality on Fe3O4 nanoparticles. The stability of the magnetic Fe3O4 nanoparticles as an adsorbent in an acidic medium was improved due to its resistance to the dissolution that was gained during carbon coating and surface functionalization with polyacrylamide. The adsorptive removal process was investigated in relation to various parameters such as pH, time of contact, metal ion concentrations, adsorbent dose, and temperature. The polyacrylamide functionalized Fe3O4 showed an improvement in the adsorption capacity as compared with the unfunctionalized one. The conditions for superior adsorption were obtained at pH 6; time of contact, 90 min; metal solution concentration, 200 mg/L; adsorbent dose, 0.3 g/L. The modeling of the adsorption data was found to be consistent with the pseudo-second-order kinetic model, which suggests a fast adsorption process. However, the equilibrium data modeling was consistent with both the Langmuir and Freundlich isotherms. Furthermore, the thermodynamic parameters of the adsorptive removal process, including ΔG°, ΔH°, and ΔS°, indicated a spontaneous and endothermic sorption process. The developed adsorbent can be utilized further for industrial-based applications.
Mohamed A. Habila; Zeid A. Alothman; Ahmed Mohamed El-Toni; Joselito Puzon Labis; Aslam Khan; Adel Al-Marghany; Hussein Elsayed Elafifi. One-Step Carbon Coating and Polyacrylamide Functionalization of Fe3O4 Nanoparticles for Enhancing Magnetic Adsorptive-Remediation of Heavy Metals. Molecules 2017, 22, 2074 .
AMA StyleMohamed A. Habila, Zeid A. Alothman, Ahmed Mohamed El-Toni, Joselito Puzon Labis, Aslam Khan, Adel Al-Marghany, Hussein Elsayed Elafifi. One-Step Carbon Coating and Polyacrylamide Functionalization of Fe3O4 Nanoparticles for Enhancing Magnetic Adsorptive-Remediation of Heavy Metals. Molecules. 2017; 22 (12):2074.
Chicago/Turabian StyleMohamed A. Habila; Zeid A. Alothman; Ahmed Mohamed El-Toni; Joselito Puzon Labis; Aslam Khan; Adel Al-Marghany; Hussein Elsayed Elafifi. 2017. "One-Step Carbon Coating and Polyacrylamide Functionalization of Fe3O4 Nanoparticles for Enhancing Magnetic Adsorptive-Remediation of Heavy Metals." Molecules 22, no. 12: 2074.
Anees A. Ansari; Joselito Labis; Mohamed Aslam Manthrammel. Designing of luminescent GdPO 4 :[email protected] 4 @SiO 2 core/shell nanorods: Synthesis, structural and luminescence properties. Solid State Sciences 2017, 71, 117 -122.
AMA StyleAnees A. Ansari, Joselito Labis, Mohamed Aslam Manthrammel. Designing of luminescent GdPO 4 :[email protected] 4 @SiO 2 core/shell nanorods: Synthesis, structural and luminescence properties. Solid State Sciences. 2017; 71 ():117-122.
Chicago/Turabian StyleAnees A. Ansari; Joselito Labis; Mohamed Aslam Manthrammel. 2017. "Designing of luminescent GdPO 4 :[email protected] 4 @SiO 2 core/shell nanorods: Synthesis, structural and luminescence properties." Solid State Sciences 71, no. : 117-122.
Joselito P. Labis; Anwar Q. Alanazi; Hamad A. AlBrithen; Ahmed Mohamed El-Toni; Mahmoud Hezam; Hussein Elsayed Elafifi; Osama M. Abaza. SrZnO nanostructures grown on templated Al 2 O 3 substrates by pulsed laser deposition. AIP Advances 2017, 7, 95220 .
AMA StyleJoselito P. Labis, Anwar Q. Alanazi, Hamad A. AlBrithen, Ahmed Mohamed El-Toni, Mahmoud Hezam, Hussein Elsayed Elafifi, Osama M. Abaza. SrZnO nanostructures grown on templated Al 2 O 3 substrates by pulsed laser deposition. AIP Advances. 2017; 7 (9):95220.
Chicago/Turabian StyleJoselito P. Labis; Anwar Q. Alanazi; Hamad A. AlBrithen; Ahmed Mohamed El-Toni; Mahmoud Hezam; Hussein Elsayed Elafifi; Osama M. Abaza. 2017. "SrZnO nanostructures grown on templated Al 2 O 3 substrates by pulsed laser deposition." AIP Advances 7, no. 9: 95220.
Anees A. Ansari; Ali K. Aldalbahi; Joselito Labis; Mohamed Aslam Manthrammel. Impact of surface coating on physical properties of europium-doped gadolinium fluoride microspheres. Journal of Fluorine Chemistry 2017, 199, 7 -13.
AMA StyleAnees A. Ansari, Ali K. Aldalbahi, Joselito Labis, Mohamed Aslam Manthrammel. Impact of surface coating on physical properties of europium-doped gadolinium fluoride microspheres. Journal of Fluorine Chemistry. 2017; 199 ():7-13.
Chicago/Turabian StyleAnees A. Ansari; Ali K. Aldalbahi; Joselito Labis; Mohamed Aslam Manthrammel. 2017. "Impact of surface coating on physical properties of europium-doped gadolinium fluoride microspheres." Journal of Fluorine Chemistry 199, no. : 7-13.
This work reports the zirconia (ZrOx) nanoparticles doped MnCO3 catalysts prepared by facile and simple coprecipitation technique and the synthesis of zirconia-manganese carbonate [X% ZrOx–MnCO3] (where X% = 0–7%) catalyst which upon calcination at 400°C is converted to zirconia-manganese dioxide [1% ZrOx–MnO2] and when calcined at 500°C is converted to zirconia-manganic trioxide [1% ZrOx–Mn2O3]. A comparative catalytic study was performed to investigate the catalytic efficiency between carbonate and oxides for the selective oxidation of 1-phenylethanol by using molecular O2 as a clean oxidant. The influence of several parameters such as w/w% of ZrOx, reaction time, calcination temperature, catalyst amount, and reaction temperature has been thoroughly examined using oxidation of 1-phenylethanol as a model substrate. The 1% ZrOx–MnCO3 precalcined at 300°C exhibited the best catalytic efficiency. It was found that ZrOx nanoparticles also play an essential role in enhancing the effectiveness of the catalytic system for the aerobic oxidation of alcohols. Furthermore, the physical and chemical properties of synthesized catalysts were evaluated by microscopic and spectroscopic techniques. An extremely high specific activity of 40 mmol·g−1·h−1 with a 100% conversion of oxidation product and selectivity of >99% was achieved within extremely short reaction time (6 min).
Mohamed E. Assal; Mufsir Kuniyil; Mujeeb Khan; Mohammed Rafi Shaik; Abdulrahman Al-Warthan; Mohammed Rafiq H. Siddiqui; Joselito Labis; Syed Farooq Adil. Comparative Catalytic Evaluation of Nano-ZrOx Promoted Manganese Catalysts: Kinetic Study and the Effect of Dopant on the Aerobic Oxidation of Secondary Alcohols. Advances in Materials Science and Engineering 2017, 2017, 1 -14.
AMA StyleMohamed E. Assal, Mufsir Kuniyil, Mujeeb Khan, Mohammed Rafi Shaik, Abdulrahman Al-Warthan, Mohammed Rafiq H. Siddiqui, Joselito Labis, Syed Farooq Adil. Comparative Catalytic Evaluation of Nano-ZrOx Promoted Manganese Catalysts: Kinetic Study and the Effect of Dopant on the Aerobic Oxidation of Secondary Alcohols. Advances in Materials Science and Engineering. 2017; 2017 ():1-14.
Chicago/Turabian StyleMohamed E. Assal; Mufsir Kuniyil; Mujeeb Khan; Mohammed Rafi Shaik; Abdulrahman Al-Warthan; Mohammed Rafiq H. Siddiqui; Joselito Labis; Syed Farooq Adil. 2017. "Comparative Catalytic Evaluation of Nano-ZrOx Promoted Manganese Catalysts: Kinetic Study and the Effect of Dopant on the Aerobic Oxidation of Secondary Alcohols." Advances in Materials Science and Engineering 2017, no. : 1-14.
A magnetic nanosorbent was prepared from Fe3O4 nanoparticles and polyacrylamide using a solvothermal process. Two functions are achieved simultaneously in this process: The first consists in the formation of a carbon layer around the Fe3O4 nanoparticles, and the second one in the functionalization with an amido group. This combination allows the protection of Fe3O4 nanoparticles from dissolution in acid medium during heavy metal adsorption. The adsorbent was characterized by SEM, TEM, EDS, FTIR, TGA, and in terms of surface area. Results showed the Fe3O4 nanoparticles to be embedded in a sheet of carbon with folded surfaces which is functionalized with amido groups. The nanosorbent was applied to the enrichment of Cr(III), Co(II), Cd(II), Zn(II) and Pb(II) via magnetic solid phase extraction (mag-SPE). The effects of pH value, eluent type and sample volume were optimized. The validation of the procedure was verified by the analysis of a wheat gluten certified reference material (8418). The limits of detection for the above ions range from 1 to 110 ng L−1. The relative standard deviations are <10%. The procedure was successfully applied to the enrichment of Cr(III), Co(II), Cd(II), Zn(II) and Pb(II) from various water and food samples.
Mohamed Habila; Zeid Alothman; Ahmed Mohamed El-Toni; Saad A. Al-Tamrah; Mustafa Soylak; Joselito Labis. Carbon-coated Fe3O4 nanoparticles with surface amido groups for magnetic solid phase extraction of Cr(III), Co(II), Cd(II), Zn(II) and Pb(II) prior to their quantitation by ICP-MS. Mikrochimica Acta 2017, 184, 2645 -2651.
AMA StyleMohamed Habila, Zeid Alothman, Ahmed Mohamed El-Toni, Saad A. Al-Tamrah, Mustafa Soylak, Joselito Labis. Carbon-coated Fe3O4 nanoparticles with surface amido groups for magnetic solid phase extraction of Cr(III), Co(II), Cd(II), Zn(II) and Pb(II) prior to their quantitation by ICP-MS. Mikrochimica Acta. 2017; 184 (8):2645-2651.
Chicago/Turabian StyleMohamed Habila; Zeid Alothman; Ahmed Mohamed El-Toni; Saad A. Al-Tamrah; Mustafa Soylak; Joselito Labis. 2017. "Carbon-coated Fe3O4 nanoparticles with surface amido groups for magnetic solid phase extraction of Cr(III), Co(II), Cd(II), Zn(II) and Pb(II) prior to their quantitation by ICP-MS." Mikrochimica Acta 184, no. 8: 2645-2651.
We demonstrate a one‐step solvothermal synthesis of [email protected] nanocomposites using benzyl alcohol as solvent and stabilizing ligand. The as‐synthesized [email protected] hybrid nanocomposites showed a homogeneous distribution of the ZrO2 NPs (≈ 5 nm) onto HRG nanosheets. High resolution (HR)TEM, X‐ray diffraction (XRD), and Raman spectroscopy confirmed the presence of cubic ZrO2. The presence of benzyl alcohol as stabilizing ligand was demonstrated by ultraviolet‐visible (UV‐vis), Fourier‐transform infrared (FT‐IR) spectroscopy and thermogravimetric analysis (TGA). The reduction of graphene oxide to HRG was also realized by X‐ray photoelectron spectroscopy (XPS). A study of the [email protected] formation mechanism revealed that benzyl alcohol adsorbs on HRG through π‐π interactions between the planar benzene ring of benzyl alcohol and the HRG nanosheets. The hydroxyl groups act as anchor groups to facilitate the nucleation of ZrO2 NPs. The effect of the metal oxide precursor concentration on the coating density of ZrO2 NPs was studied by preparing [email protected] nanocomposites with different concentrations of zirconium precursor.
Mohammed R. Shaik; Abdulhadi H. Al-Marri; Syed Adil; Nils Mohri; Bastian Barton; Mohammed R. H. Siddiqui; Abdulrahman Al‐Warthan; Joselito P. Labis; Wolfgang Tremel; Mujeeb Khan; Muhammad N. Tahir. Benzyl Alcohol Assisted Synthesis and Characterization of Highly Reduced Graphene Oxide (HRG)@ZrO2 Nanocomposites. ChemistrySelect 2017, 2, 3078 -3083.
AMA StyleMohammed R. Shaik, Abdulhadi H. Al-Marri, Syed Adil, Nils Mohri, Bastian Barton, Mohammed R. H. Siddiqui, Abdulrahman Al‐Warthan, Joselito P. Labis, Wolfgang Tremel, Mujeeb Khan, Muhammad N. Tahir. Benzyl Alcohol Assisted Synthesis and Characterization of Highly Reduced Graphene Oxide (HRG)@ZrO2 Nanocomposites. ChemistrySelect. 2017; 2 (10):3078-3083.
Chicago/Turabian StyleMohammed R. Shaik; Abdulhadi H. Al-Marri; Syed Adil; Nils Mohri; Bastian Barton; Mohammed R. H. Siddiqui; Abdulrahman Al‐Warthan; Joselito P. Labis; Wolfgang Tremel; Mujeeb Khan; Muhammad N. Tahir. 2017. "Benzyl Alcohol Assisted Synthesis and Characterization of Highly Reduced Graphene Oxide (HRG)@ZrO2 Nanocomposites." ChemistrySelect 2, no. 10: 3078-3083.
Syed Adil; MohamedE. Assal; Mufsir Kuniyil; Mujeeb Khan; Mohammed Rafi Shaik; Abdulrahman Alwarthan; JoselitoP. Labis; Mohammed RafiqH. Siddiqui. Synthesis and comparative catalytic study of zinc oxide (ZnO x ) nanoparticles promoted MnCO 3 , MnO 2 and Mn 2 O 3 for selective oxidation of benzylic alcohols using molecular oxygen. Materials Express 2017, 7, 79 -92.
AMA StyleSyed Adil, MohamedE. Assal, Mufsir Kuniyil, Mujeeb Khan, Mohammed Rafi Shaik, Abdulrahman Alwarthan, JoselitoP. Labis, Mohammed RafiqH. Siddiqui. Synthesis and comparative catalytic study of zinc oxide (ZnO x ) nanoparticles promoted MnCO 3 , MnO 2 and Mn 2 O 3 for selective oxidation of benzylic alcohols using molecular oxygen. Materials Express. 2017; 7 (2):79-92.
Chicago/Turabian StyleSyed Adil; MohamedE. Assal; Mufsir Kuniyil; Mujeeb Khan; Mohammed Rafi Shaik; Abdulrahman Alwarthan; JoselitoP. Labis; Mohammed RafiqH. Siddiqui. 2017. "Synthesis and comparative catalytic study of zinc oxide (ZnO x ) nanoparticles promoted MnCO 3 , MnO 2 and Mn 2 O 3 for selective oxidation of benzylic alcohols using molecular oxygen." Materials Express 7, no. 2: 79-92.
We have discovered a structural transition for the SrZnO alloy films from a wurtzite to a rock-salt structure, leading to a reduction in the (112̲0)/(0001) surface energy ratio. The films were grown by pulsed laser deposition using different SrO ratios, x. We have revealed that growth at a higher temperature, 750°C, resulted in a sharp 0002 peak at a low SrO content (5%), whereas growth at a higher SrO content (10%) resulted in a non-crystalline film with minute crystallites with a (112̲0) orientation. Generally the crystallinity decreased as the SrO content increased. No results obtained for the crystalline films showed any orientation of significant peaks besides the peak attributed to the (0001) plane, suggesting epitaxial growth. Optical measurements showed difference in transmission widows of alloys with different SrO percentage, and this was correlated to SrO influence on growth mode as indicated by scanning electron imaging. The studied SrZnO films, with SrO/(SrO + ZnO) ≤ 0.25, were grown by pulsed laser deposition using different SrO ratios, x. The effects of temperature and oxygen pressure during growth on the films’ structural properties were investigated. XRD results indicate that the film crystallinity was improved as the temperature and O2 pressure increased up to 650°C and 0.5 Torr, respectively.
H. A. AlBrithen; M. Elnaggar; Katarzyna Ozga; M. Szota; Z. A. AlAhmed; A. Q. Alanazi; H. Alshahrani; E. Alfaifi; M. A. Djouadi; J. P. Labis. Structural Transition in SrZnO Laser Pulse Deposited Alloy. Archives of Metallurgy and Materials 2017, 62, 211 -216.
AMA StyleH. A. AlBrithen, M. Elnaggar, Katarzyna Ozga, M. Szota, Z. A. AlAhmed, A. Q. Alanazi, H. Alshahrani, E. Alfaifi, M. A. Djouadi, J. P. Labis. Structural Transition in SrZnO Laser Pulse Deposited Alloy. Archives of Metallurgy and Materials. 2017; 62 (1):211-216.
Chicago/Turabian StyleH. A. AlBrithen; M. Elnaggar; Katarzyna Ozga; M. Szota; Z. A. AlAhmed; A. Q. Alanazi; H. Alshahrani; E. Alfaifi; M. A. Djouadi; J. P. Labis. 2017. "Structural Transition in SrZnO Laser Pulse Deposited Alloy." Archives of Metallurgy and Materials 62, no. 1: 211-216.
Silver ion-doped cerium oxide nanoparticles were prepared by polyol-based coprecipitation. Here, the impact of silver doping is evaluated on the crystallographic, optoelectronic, thermogravimetric, and redox behavior of cerium oxide nanoparticles. Spectroscopic techniques were used to characterize the phase purity, crystallinity, morphological structure, and optical and redox properties of nanoproducts. X-ray diffraction confirmed the formation of well-crystallized cerium oxide tetragonal fluorite. The optical absorption spectra and band gap energy were significantly affected following doping that was influenced by the crystalline size. Temperature production reduction investigated the influence of silver concentration on the redox properties of cerium oxide nanoparticles. These catalysts were reversible in cyclic redox reaction to 500°C, nonpyrophoric, and therefore demonstrated potential for applications for hydrogen generation for fuel cells and electrochemical biosensors.
A. A. Ansari; J. P. Labis; M. Alam; Shahid M. Ramay; N. Ahmed; Asif Mahmood. Preparation and Spectroscopic, Microscopic, Thermogravimetric, and Electrochemical Characterization of Silver-Doped Cerium(IV) Oxide Nanoparticles. Analytical Letters 2017, 50, 1360 -1371.
AMA StyleA. A. Ansari, J. P. Labis, M. Alam, Shahid M. Ramay, N. Ahmed, Asif Mahmood. Preparation and Spectroscopic, Microscopic, Thermogravimetric, and Electrochemical Characterization of Silver-Doped Cerium(IV) Oxide Nanoparticles. Analytical Letters. 2017; 50 (8):1360-1371.
Chicago/Turabian StyleA. A. Ansari; J. P. Labis; M. Alam; Shahid M. Ramay; N. Ahmed; Asif Mahmood. 2017. "Preparation and Spectroscopic, Microscopic, Thermogravimetric, and Electrochemical Characterization of Silver-Doped Cerium(IV) Oxide Nanoparticles." Analytical Letters 50, no. 8: 1360-1371.
Monodispersed luminescent functionalized core-shell nanospheres (LFCSNs) were successfully synthesized and investigated for their cyto-toxic effect on human liver hepatocellular carcinoma cell line (HepG2 cells) by adopting MTT, DNA Ladder, TUNEL assay and qPCR based gene expressions through mRNA quantifications. The TUNEL and DNA ladder assays suggested an insignificant apoptosis in HepG2 cells due to the LFCSNs treatment. Further, the qPCR results also show that the mRNA expressions of cell cycle checkpoint gene p53 and apoptosis related gene (caspase-9) was up-regulated, while the antiapoptotic gene BCl-2 and apoptosis related genes FADD and CAS-3 (apoptosis effecter gene) were down-regulated in the LFCSNs treated cells. The nanospheres that were loaded into the cells confirm their intracellular uptake by light and fluorescent spectro-photometry and microscopy imaging analysis. The loaded nanospheres demonstrate an absolute resistance to photo-bleaching, which were applied for dynamic imaging to real-time tracking in-vitro cell migratory activity for continuous 24 and 48 h durations using a time-lapsed fluorescent microscope. These properties of LFCSNs could therefore promote applications in the area of fluorescent protein biolabeling and drug-delivery.
Anees A. Ansari; T.N. Hasan; N.A. Syed; Joselito Labis; Ali A. Alshatwi. In-vitro cytotoxicity and cellular uptake studies of luminescent functionalized core-shell nanospheres. Saudi Journal of Biological Sciences 2016, 24, 1392 -1403.
AMA StyleAnees A. Ansari, T.N. Hasan, N.A. Syed, Joselito Labis, Ali A. Alshatwi. In-vitro cytotoxicity and cellular uptake studies of luminescent functionalized core-shell nanospheres. Saudi Journal of Biological Sciences. 2016; 24 (6):1392-1403.
Chicago/Turabian StyleAnees A. Ansari; T.N. Hasan; N.A. Syed; Joselito Labis; Ali A. Alshatwi. 2016. "In-vitro cytotoxicity and cellular uptake studies of luminescent functionalized core-shell nanospheres." Saudi Journal of Biological Sciences 24, no. 6: 1392-1403.
Hamid M. Ghaithan; Saif M.H. Qaid; Mahmoud Hezam; Joselito P. Labis; Mohammad Alduraibi; Idriss M. Bedja; Abdullah S. Aldwayyan. Laser induced photocurrent and photovoltage transient measurements of dye-sensitized solar cells based on TiO2 nanosheets and TiO2 nanoparticles. Electrochimica Acta 2016, 212, 992 -997.
AMA StyleHamid M. Ghaithan, Saif M.H. Qaid, Mahmoud Hezam, Joselito P. Labis, Mohammad Alduraibi, Idriss M. Bedja, Abdullah S. Aldwayyan. Laser induced photocurrent and photovoltage transient measurements of dye-sensitized solar cells based on TiO2 nanosheets and TiO2 nanoparticles. Electrochimica Acta. 2016; 212 ():992-997.
Chicago/Turabian StyleHamid M. Ghaithan; Saif M.H. Qaid; Mahmoud Hezam; Joselito P. Labis; Mohammad Alduraibi; Idriss M. Bedja; Abdullah S. Aldwayyan. 2016. "Laser induced photocurrent and photovoltage transient measurements of dye-sensitized solar cells based on TiO2 nanosheets and TiO2 nanoparticles." Electrochimica Acta 212, no. : 992-997.
Interference of organic compounds in the matrix of heavy metal solution could suppress their pre-concentration and detection processes. Therefore, this work aimed to develop simple and facile methods for separation of heavy metals before ICP-MS analysis. [email protected]@TiO2 core-double shell magnetic adsorbent was prepared and characterized by TEM, SEM, FTIR, XRD and surface area, and tested for Magnetic Solid Phase Extraction (MSPE) of Cu(II), Zn(II), Cd(II) and Pb(II). TEM micrograph of [email protected]@TiO2 reveals the uniform coating of TiO2 layer of about 20 nm onto the [email protected] nanoparticles and indicates that all nanoparticles are monodispersed and uniform. The saturation magnetization from the room-temperature hysteresis loops of Fe3O4 and [email protected]@TiO2 was found to be 72 and 40 emu.g−1, respectively, suggesting good separability of the nanoparticles. The [email protected]@TiO2 showed maximum adsorption capacity of 125, 137, 148 and 160 mg.g−1 for Cu(II), Zn(II), Cd(II) and Pb(II) respectively, and the process was found to fit with the second order kinetic model and Langmuir isotherm. [email protected]@TiO2 showed efficient photocatalytic decomposition for tartrazine and sunset yellow (consider as Interfering organic compounds) in aqueous solution under the irradiation of UV light. The maximum recovery% was achieved at pH 5, by elution with 10 mL of 2 M nitric acid solution. The LODs were found to be 0.066, 0.049, 0.041 and 0.082 µg.L−1 for Cu(II), Zn(II), Cd(II) and Pb(II), respectively while the LOQs were found to be 0.20, 0.15, 0.12 and 0.25 µg L−1 for Cu(II), Zn(II), Cd(II) and Pb(II), respectively.
Mohamed Habila; Zeid A. Alothman; Ahmed Mohamed El-Toni; Joselito Labis; Mustafa Soylak. Synthesis and application of [email protected]@TiO2 for photocatalytic decomposition of organic matrix simultaneously with magnetic solid phase extraction of heavy metals prior to ICP-MS analysis. Talanta 2016, 154, 539 -547.
AMA StyleMohamed Habila, Zeid A. Alothman, Ahmed Mohamed El-Toni, Joselito Labis, Mustafa Soylak. Synthesis and application of [email protected]@TiO2 for photocatalytic decomposition of organic matrix simultaneously with magnetic solid phase extraction of heavy metals prior to ICP-MS analysis. Talanta. 2016; 154 ():539-547.
Chicago/Turabian StyleMohamed Habila; Zeid A. Alothman; Ahmed Mohamed El-Toni; Joselito Labis; Mustafa Soylak. 2016. "Synthesis and application of [email protected]@TiO2 for photocatalytic decomposition of organic matrix simultaneously with magnetic solid phase extraction of heavy metals prior to ICP-MS analysis." Talanta 154, no. : 539-547.
Mohamed A. Habila; Zeid A. Alothman; Ahmed Mohamed El-Toni; Joselito Labis; Xiaomin Li; Fan Zhang; Mustafa Soylak. Mercaptobenzothiazole-functionalized magnetic carbon nanospheres of type [email protected]@C for the preconcentration of nickel, copper and lead prior to their determination by ICP-MS. Microchimica Acta 2016, 183, 2377 -2384.
AMA StyleMohamed A. Habila, Zeid A. Alothman, Ahmed Mohamed El-Toni, Joselito Labis, Xiaomin Li, Fan Zhang, Mustafa Soylak. Mercaptobenzothiazole-functionalized magnetic carbon nanospheres of type [email protected]@C for the preconcentration of nickel, copper and lead prior to their determination by ICP-MS. Microchimica Acta. 2016; 183 (8):2377-2384.
Chicago/Turabian StyleMohamed A. Habila; Zeid A. Alothman; Ahmed Mohamed El-Toni; Joselito Labis; Xiaomin Li; Fan Zhang; Mustafa Soylak. 2016. "Mercaptobenzothiazole-functionalized magnetic carbon nanospheres of type [email protected]@C for the preconcentration of nickel, copper and lead prior to their determination by ICP-MS." Microchimica Acta 183, no. 8: 2377-2384.
The structure, the morphology and the thermal, optical and the surface properties of nanocrystalline CeO2 doped with Mn have been studied by X-ray diffraction (XRD), field-emission transmission electron microscopy (FE-TEM), energy-dispersive X-ray analysis, thermogravimetric analysis, UV–Vis absorption spectroscopy and Fourier transform infrared spectroscopy. The XRD results confirmed the successful incorporation of Mn into the CeO2 lattice through the formation of nanoscale face-centered cubic solid solution. The FE-TEM observations supported the nanocrystalline nature of the solid solutions. The presence of structural defects and their role on the band gap have been discussed on the basis of absorption spectral studies. The structural differences correlate with results from temperature-programmed reaction (TPR) experiments with H2 consumption. The TPR measurements showed an enhanced bulk reduction at much lower temperatures, indicating increased oxygen mobility in the samples, which enable to enhanced oxygen diffusion at lower temperatures.
Anees A. Ansari; Joselito Labis; Manawwer Alam; Shahid M. Ramay; Naushad Ahmad; Asif Mahmood. Synthesis, Structural and Optical Properties of Mn-Doped Ceria Nanoparticles: A Promising Catalytic Material. Acta Metallurgica Sinica (English Letters) 2016, 29, 265 -273.
AMA StyleAnees A. Ansari, Joselito Labis, Manawwer Alam, Shahid M. Ramay, Naushad Ahmad, Asif Mahmood. Synthesis, Structural and Optical Properties of Mn-Doped Ceria Nanoparticles: A Promising Catalytic Material. Acta Metallurgica Sinica (English Letters). 2016; 29 (3):265-273.
Chicago/Turabian StyleAnees A. Ansari; Joselito Labis; Manawwer Alam; Shahid M. Ramay; Naushad Ahmad; Asif Mahmood. 2016. "Synthesis, Structural and Optical Properties of Mn-Doped Ceria Nanoparticles: A Promising Catalytic Material." Acta Metallurgica Sinica (English Letters) 29, no. 3: 265-273.
In this study, we doped different concentrations of copper ion in CeO2 matrix to investigate the influence of doping concentrations on crystal structure, thermal, optical and redox properties of the as-prepared nanoproducts. X-ray diffraction (XRD) patterns indicate that the doped CeO2 nanoparticles were highly crystalline with dominant (111) texture. No other impurities were observed and Cu ions were homogenously distributed inside the CeO2 lattice. As observed by transmission electron microscopy (TEM) the homogenously distributed nanoparticles were agglomerated with increase doping contents because of decreased crystalinity. The temperature program reduction (TPR) technique was used to examine the redox character of the doped ceria nanoparticles. The Cu ions doped CeO2 were reduced at low temperature indicating the high catalytic activity. The synergistic interaction between Cu and CeO2 was the main factor responsible for high catalytic activity of the Cu doped CeO2 model catalysts. Furthermore, the as-obtained Cu-doped CeO2 nanoparticles revealed superior redox performance in contrast with pure CeO2 prepared by the same route.
Anees A. Ansari; Joselito Labis; Manawwer Alam; Shahid M. Ramay; N. Ahmad; Asif Mahmood. Influence of copper ion doping on structural, optical and redox properties of CeO2 nanoparticles. Journal of Electroceramics 2016, 36, 150 -157.
AMA StyleAnees A. Ansari, Joselito Labis, Manawwer Alam, Shahid M. Ramay, N. Ahmad, Asif Mahmood. Influence of copper ion doping on structural, optical and redox properties of CeO2 nanoparticles. Journal of Electroceramics. 2016; 36 (1-4):150-157.
Chicago/Turabian StyleAnees A. Ansari; Joselito Labis; Manawwer Alam; Shahid M. Ramay; N. Ahmad; Asif Mahmood. 2016. "Influence of copper ion doping on structural, optical and redox properties of CeO2 nanoparticles." Journal of Electroceramics 36, no. 1-4: 150-157.