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Photocatalytic and photochemical processes of AgCl/TiO_(2) studied with a fully integrated X-ray photoelectron spectrometer

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Rare Metals 2021年第4期40卷 799-807页

作者： Kai Zhou Wen-Lu He Xiao Zhang Bin Zhang Xiang-Nan Gong Kai-Wen Wang Zhi-Chao Zhang Xi-Lan Zhang Zhi-Ning Xia Xiao-Yuan Zhou Analytical and Testing Center Chongqing UniversityChongqing 401331China College of Physics Chongqing UniversityChongqing 401331China Beijing Key Laboratory and Institute of Microstructure and Property of Advanced Materials Beijing University of TechnologyBeijing 100124China School of Materials Science and Engineering Chongqing UniversityChongqing 400045China

A fully integrated X-ray photoelectron spectrometer(XPS) was employed for the investigation of the separation processes and recombination behaviors of photogenerated electrons and holes on the surface of AgCl and ultra-small nano-titanium oxide cluster composite photocatalyst(AgCl/TiO_(2)).A facile route,by direct colloidal synthesis,for preparing AgCl/TiO_(2)with high stability and enhanced visible light(Vis) driven catalytic activity was reported.The photocatalytic activity of AgCl/TiO_(2),which revealed that the photo-degradation rate of the as-prepared AgCl/TiO_(2)was nearly 10.5 times higher than that of bare AgCl,was evaluated by applying it to the photo-degradation of methyl orange(MO) in water solution.Moreover,AgCl/TiO_(2)exhibited an outstanding long-term stability during ten cycles of photo-degradation.The band gap of AgCl decreased from 3.25 to 2.85 eV because of the ultrasmall nano-TiO_(2)clusters that were pinned to its surface.The results indicate that the Band gap narrowing and surface plasmon resonance(SPR) of Ag(0) were two major contributors to the enhancement of the photocatalytic activity of AgCl/TiO_(2)by improving the utilization of Vis.In situ XPS analysis was,therefore,certified as a beneficial method to explore the catalytic mechanism of photocatalysts.

关键词： Photocatalysis AgCl/TiO_(2) Fully integrated XPS Band gap narrowing

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