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- 검색키워드
- 저자 : Khalid A. Alzahrani (검색결과 2 건)
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Khalid A. Alzahrani,Adel A. Ismail 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.124 No.-
In the present work, WO3 NPs were fabricated using a facile hydrothermal method assisted bypolyvinylpyrrolidone (PVP) for the first time, and AgVO3 with different weight percentages (3%, 6%, 9%and 12%) was uniformly distributed on the surface of mesoporous WO3 by impregnation - calcinationprocesses to construct n-n heterojunction AgVO3/WO3 nanocomposites. The obtained AgVO3/WO3nanocomposites were utilized for the effective Ciprofloxacin (CIP) degradation during visible illumination. The XRD and TEM investigations verified the formation of AgVO3 and WO3 in a monoclinic crystalstructure with a particle size of 40 nm. XPS and TEM measurements evidenced the existence of Agoand Ag+ in the heterostructure AgVO3/WO3 system. 9%AgVO3/WO3 nanocomposite exhibited larger photocatalyticperformance, i.e., 100% with 120 min of illumination, than the other nanocomposite photocatalysts. The apparent rate constant of 9% AgVO3/WO3 nanocomposite (0.0162 min1) was enhanced 18times greater than the WO3 NPs (0.0009 min1). The efficient photocatalytic performance could correlatewith the close contact between AgVO3 and WO3 NPs, which enhanced the visible light absorption andefficacious separation of the carriers during degradation reactions. The AgVO3/WO3 nanocompositeobeyed the S-scheme mechanism for charge transfer to achieve promising redox abilities in bothAgVO3 and WO3. The optimized 9% AgVO3/WO3 photocatalyst showed high reusability and photostabilityfor five consecutive runs without loss its efficiency. This study provides a new mechanism for addressinghighly effective nanocomposites with excellent photocatalytic ability that exhibit practical applicationsin the environmental remediation of antibiotics.
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Alenad Asma M.,Fatima Sofia,Khalid Usman,Bano Nigarish,Abid Abdul Ghafoor,Manzoor Sumaira,Farid Hafiz Muhammad Tahir,Messali Mouslim,Alzahrani Huda A.,Taha Taha Abdel Mohaymen 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.5
Hydrogen is the ideal future fuel, since it is clean, saves energy, and is abundant in nature. Though there are several methods for producing hydrogen, only a few of them are environmentally friendly. To employ water electrolysis to make hydrogen and solve the energy shortage problem, highly active electrocatalysts must be created. Zinc sulphide/polyaniline (ZnS/PANI) nanocomposite was successfully produced using a straightforward two-step coprecipitation and polymerization procedure. Different analyses were used to characterize the fabricated materials. The findings show that the ZnS/PANI nanocomposite's morphology has a consistent porous shape, and the electrical structure of the active sites determines how well catalysts can make contact with the intermediates. Multiple attempts have been made to create the most affordable, functional electrocatalyst for oxygen evolution reactions (OER). However, clean energy production from such materials is sluggish. In comparison to pure PANI nanofibers (143.14 m2 g−1 and 0.4827 nm) and ZnS nanostructures (249.85 m2 g−1 and 0.4224 nm), the composite ZnS/PANI displays a greater Brunauer–Emmett–Teller (BET) surface area around 372.65 m2 g−1 along with nanoporous size of 0.393 nm due to the interaction, which provides distinctive features in contrast to ZnS and PANI. Synergistically, composite ZnS/PANI indicates lower overpotentials of 132 mV for oxygen evolution performance at 10 mA cm−2. An improved OER activity is observed by composite ZnS/PANIs as high current density, lower overpotential and reduced Tafel value of 53 mV dec−1. This catalyst also exhibited a significant double-layer capacitance and a large electrochemically active surface area. ZnS/PANI is a magnificent electrocatalyst for oxygen evolution.
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