2D/2DBi2MoO6/g-C3N4S-schemeheterojunctionphotocatalystwithenhancedvisible-lightactivitybyAuloading

被引:26
作者
Qiaoqiao Li [1 ]
Wenli Zhao [1 ]
Zicheng Zhai [1 ]
Kaixu Ren [1 ]
Tingyu Wang [1 ]
Hao Guan [1 ]
Haifeng Shi [1 ,2 ]
机构
[1] School of Science, Jiangnan University
[2] Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Jiangnan University
关键词
D O I
暂无
中图分类号
O643.36 [催化剂]; O644.1 [光化学];
学科分类号
081705 ; 070304 ; 081704 ;
摘要
A novel 2D/2D Bi2MoO6/g-C3N4 step-scheme(S-scheme) composite by loading Au as cocatalyst was successfully fabricated using a photoreduction and hydrothermal route. The obtained Bi2MoO6/g-C3N4/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 Bi2MoO6/g-C3N4/Au was about 9.7 times and 13.1 times as high as those of Bi2MoO6 and g-C3N4, respectively. The notably improved photocatalytic activity of Bi2MoO6/g-C3N4/Au could be mainly ascribed to the abundant active sites and the enhanced separation efficiency of photogenerated carriers in Bi2MoO6/g-C3N4 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-C3N4. Additionally, a possible step-scheme photocatalytic reaction mechanism of Rh B degradation over Bi2MoO6/g-C3N4/Au was tentatively proposed. PL and transient photocurrent analysis implied that Bi2MoO6/g-C3N4/Au photocatalysts possessed the lower recombination rate of photogenerated carriers compared with pure Bi2 MoO6 and g-C3N4, respectively. The present work is expected to provide useful information in designing 2D/2D S-scheme heterojunction photocatalysts.
引用
收藏
页码:216 / 226
页数:11
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