2D/2D Bi_(2)MoO_(6)/g-C_(3)N_(4) S-scheme heterojunction photocatalyst with enhanced visible-light activity by Au loading  

作　　者：Qiaoqiao Li Wenli Zhao Zicheng Zhai Kaixu Ren Tingyu Wang Hao Guan Haifeng Shi 

机构地区：[1]School of Science,Jiangnan University,Wuxi,214122,China [2]Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology,Jiangnan University,Wuxi,214122,China

出　　处：《Journal of Materials Science & Technology》2020年第21期216-226,共11页材料科学技术（英文版）

基　　金：financially supported by the Fundamental Research Funds for the Central Universities(No.JUSRP51716A);the National Natural Science Foundation of China(Nos.21203077 and 21773099);the financially support from the Qing Lan Project of Jiangsu Province。

摘　　要：A novel 2D/2D Bi_(2)MoO_(6)/g-C_(3)N_(4) step-scheme(S-scheme)composite by loading Au as cocatalyst was successfully fabricated using a photoreduction and hydrothermal route.The obtained Bi_(2)MoO_(6)/g-C_(3)N_(4)/Au photocatalysts were characterized by X-ray diffraction(XRD),transmission electron microscope(TEM),X-ray photo-electron spectroscopy(XPS),UV–vis diffuse reflectance spectra(UV–vis),Fourier transform infrared spectroscopy(FTIR),photoluminescence(PL),photocurrent response(I-t),and electrochemical impedance spectroscopy(EIS).The HRTEM images revealed that an intimate interface in composites were formed.The optimum photocatalytic activity of Rhodamine B degradation over Bi_(2)MoO_(6)/g-C_(3)N_(4)/Au was about 9.7 times and 13.1 times as high as those of Bi_(2)MoO_(6) and g-C_(3)N_(4),respectively.The notably improved photocatalytic activity of Bi_(2)MoO_(6)/g-C_(3)N_(4)/Au could be mainly ascribed to the abundant active sites and the enhanced separation efficiency of photogenerated carriers in Bi_(2)MoO_(6)/g-C_(3)N_(4) S-scheme system.Notably,Au nanoparticles could act as a co-catalyst to further promote electron transfer and separation from the conduction band of g-C_(3)N_(4).Additionally,a possible step-scheme photocatalytic reaction mechanism of Rh B degradation over Bi_(2)MoO_(6)/g-C_(3)N_(4)/Au was tentatively proposed.PL and transient photocurrent analysis implied that Bi_(2)MoO_(6)/g-C_(3)N_(4)/Au photocatalysts possessed the lower recombination rate of photogenerated carriers compared with pure Bi_(2) MoO_(6) and g-C_(3)N_(4),respectively.The present work is expected to provide useful information in designing 2D/2D S-scheme heterojunction photocatalysts.

关 键 词：g-C_(3)N_(4) Bi_(2)MoO_(6) 2D/2D S-scheme Au loading 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学]