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Visible Light Driven Cu2O-Based Micromotors

Visible Light Driven Cu2O-Based Micromotors

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中国化学会第十七届全国胶体与界面化学学术会议

作者： Xiao Chen Hongbin Ge Wenjuan Liu College of Materials Science and Engineering Nanjing Tech University

Light-driven micromachine is emerging as promising candidate in micro/nanomotor *** one kind of colloidal particle,it can spontaneously convert light energy in the environment into kinetic energy to complete autonomous ***,most of the conventional inorganic-oxide-based photocatalytic micromotors reported so far use wide bandgap photocatalytic materials such as Ti O and ZnO as substrates,which need to be activated by ultraviolet light,and consequently limits their applications in environmental and biological *** a typical p-type narrow bandgap semiconductor functional material,CuO exhibits excellent photoelectric effect,bacteriostatic and photocatalytic performance with visible light *** this work,we synthesis CuO microparticles by liquid phase reduction method,and modify the surface to design CuO-Au Janus spherical micromotors and CuO@g-CN core/shell structure *** adjusting the wavelength and intensity of the light source and selecting different concentrations of hydrogen peroxide and glucose as chemical fuel,the optical-drive performances of micromotors under different conditions are ***,such micromotors display photodegradation capacity of methyl orange solutions under visible light irradiation and have a great potential for repairing environment.

关键词： Micromotors Visible light Cuprous oxide Graphitic carbon nitride environmental remediation

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ZnO nanorods with enhanced photocatalytic activity and high photostability under visible light and UV light irradiation

ZnO nanorods with enhanced photocatalytic activity and high ...

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中国化学会第九届全国无机化学学术会议

作者： Zhonghua Wang Ni Huang Jinxia Shu College of Chemistry and Chemical Engineering China West Normal University

Zinc oxide(ZnO) nanostructures with different morphologies, including nanorods, nanospheres and nanosheets, were prepared by a simple, one-step method via the pyrolysis of zinc acetate, zinc oxalate and zinc nitrate, respectively. The as-prepared ZnO nanostructures were characterized by X-ray powder diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray photoelectron spectroscopy(XPS) and UV-visible diffuse reflectance spectroscopy(DRS). The photocatalytic activities of the ZnO nanostructures were evaluated by the photodegradation of two typical organic dyes, rhodamine B(Rh B) and methyl orange(MO). It was found that the ZnO nanorods exhibited the highest photocatalytic activity among the three ZnO nanostructures under both visible light and UV-visible light irradiation. Furthermore, the ZnO nanorods photocatalyst also showed excellent photostability and reusability under visible and UV-visible light irradiation. In addition, mechanism studies by using active species trapping experiments suggested that hydroxyl radicals(·OH), photoinduced holes(h+) and superoxide anion radicals(·O-2) were involved in the photocatalytic process. The ·O-2played a major role under visible light irradiation, whereas the ·OH was the main active species under UV light irradiation. A possible mechanism for the charge separation and organic dye pollutants degradation was proposed.

关键词： ZnO nanostructures photocatalytic activity photostability organic pollutants environmental remediation

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