Effects of pH on Au-Deposited TiO2 for Catalytic Photoreduction of CO2 with H2O  

作　　者：Y.Y.Maruo T.Kondoh Y.Nakagawa 

机构地区：[1]Faculty of Engineering,Tohoku Institute of Technology,Sendaishi,Miyagi 982-8577,Japan

出　　处：《材料科学与工程（中英文A版）》2018年第5期209-221,共13页Journal of Materials Science and Engineering A

摘　　要：The photoreduction of CO2 to hydrocarbons is a sustainable energy technology that not only reduces emissions but also the need for alternative fuels.In this study,Au nanoparticles were deposited on anatase TiO2 using various pH controlled Au ion solutions(from pH=6 to 9).Photoreduction experiments were performed in an FT-IR gas reactor using CO2 gas with 50%relative humidity as the reactant for the four Au/TiO2 samples.CH4 was mainly detected as the CO2 reduction product,along with a small amount of CO.The amounts of CH4 produced normalised by Au weight were 437 ppm(pH 6),664 ppm(pH 7),1,040 ppm(pH 8)and 2,356 ppm(pH 9).Therefore,the pH of the solution used in Au nanoparticle deposition strongly influenced the amount of CH4 produced.The highest production efficiency was obtained when the pH of the solution was 9.Considering the experimental results,we performed X-ray photoelectron spectroscopy and transmission electron microscope measurements and found that Au particle size was influenced by the pH of the solution with the size at pH 9 being smaller than that at pH 6.It was also found that there were Au-O states at the interface of Au nanoparticles and anatase TiO2.

关 键 词：Au NANOPARTICLE AU/TIO2 PHOTOREDUCTION CO2 METHANE 

分 类 号：TB[一般工业技术]