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effects of magnetic field on Photodegradation of Methylene Blue over ZnO and TiO2 Powders using UV-LED as a Light Source

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Journal of Chemistry and Chemical Engineering 2011年第8期5卷 729-737页

作者： Supawan Joonwichien Eiji Yamasue Hideyuki Okumura Keiichi Ishihara Department of Socio-Environmental Energy Science Graduate School of Energy Science Kyoto University Yoshida Honmachi Sakyo-ku Kyoto 6068501 Japan

The magnetic field effects （MFEs） are studied on photocatalytic degradation of methylene blue （MB） solution using ZnO and TiO2 particles. The UV-VIS-NIR spectrometer is used to monitor the MB concentrations, and the dependence of the reaction rate on the initial dye concentration and settling duration is studied under UV light irradiation. It is found that the MFEs exist on the heterogeneous reaction systems for both ZnO and TiO2 powders and that the extraordinary phenomenon is reproducible. For ZnO powder, the results are in good agreement with the second-order reaction kinetics following the Langmuir-Hinshelwood （L-H） model, while the reaction for TiO2 follows first-order kinetics. It enhances the photodegradation for ZnO, while it reduces or enhances the reaction for TiO2 depending on the initial dye concentrations. The MFEs become small or negligible when the same photodecomposition experiment is carried out after settling the MB solution for more than three hours for both ZnO and TiO2. It is suggested that the key factors of MFEs on photocatalytic degradation is the condition of the MB solution as well as the characteristics of photocatalysts. The alteration of the MFEs ascribed to the solution condition caused by variation of the settling time.

关键词： magnetic field effect photocatalytic degradation Methylene blue ZnO TiO2

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Unconventional strategies to break through the efficiency of light-driven water splitting:A review

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Electron 2023年第1期1卷 4-36页

作者： Kang Wang Dingwang Huang Xiaowei Li Kuang Feng Ming Shao Jiabao Yi Weidong He Liang Qiao Yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhouChina School of Physics University of Electronic Science and Technology of ChinaChengduChina Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhanChina Global Innovative Center of Advanced Nanomaterials College of EngineeringScience and EnvironmentUniversity of NewcastleCallaghanNew South WalesAustralia Chongqing Research Institute Harbin Institute of TechnologyChongqingChina

Semiconductor-based solar-driven water splitting technology is an environmentally friendly and cost-effective approach for the production of clean *** overall solar-to-hydrogen efficiency of semiconductorbased photo(electro)catalysts is jointly determined by factors,such as light absorption efficiency of the photo(electro)catalysts,internal separation efficiency of charge carriers,and injection efficiency of surface ***,the traditional improvement strategies,such as morphology control,functional layer modification,and band alignment engineering,still have certain limitations in enhancing the conversion efficiency of the photo(electro)catalytic water ***,unconventional enhancement strategies based on surface plasmonic effects,piezoelectric effects,thermoelectric effects,and magnetic effects have provided unique pathways for improving the solar-to-hydrogen efficiency of photo(electro)***,this review outlines the fundamental concepts of these physical effects and elucidates their intrinsic mechanisms in enhancing the efficiency of photo(electro)catalysts for water splitting process through practical application ***,the future development of unconventional strategies for enhancing photo(electro)catalytic water splitting is envisioned.

关键词： localized surface plasmon resonance magnetic field effect photothermal effect piezoelectric effect solar water splitting

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