Photocatalytic Characteristics of ZnO/Ag2CrO4 Composite and Its Photocatalytic Mechanism with Z-scheme of Electron Transport
YU Fucheng1, NAN Dongmei1, SONG Tianyun1, WANG Bolong1, XU Boyu1, HE Ling1, WANG Shu1, DUAN Hongyan2
1 School of Material Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China; 2 School of Mechanical and Electrical Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Abstract: The La-doped ZnO nanorods composited with Ag2CrO4 nanosheets (ZnO/Ag2CrO4) were prepared by a hydrothermal method followed by a photo-deposition process. And the photocatalytic properties of the ZnO/Ag2CrO4 composite were examined by a degradation of methyl orange (MO) solution at room temperature. In the investigation of absorption properties of the ZnO/Ag2CrO4 composite, an obvious red-shift of the intrinsic absorption edge of ZnO was observed, which was induced by the composited Ag2CrO4 nano-sheets. Therefore, compared with pure ZnO, the utilization rate of solar light was improved effectively by the composite, which was beneficial to the elevation of the photocatalytic efficiency. Furthermore, the photocatalytic efficiency of the composite increased with the increasing of the content of the Ag2CrO4 nano-sheets in the composite, and the optimum photocatalytic efficiency appeared in the sample prepared with the Ag+ concentration being 6% of Zn source concentration during photo-deposition process. When the Ag+ concentration was further increased, the excess Ag2CrO4 was produced, which led to degradation of photocatalytic efficiency. Based on the measurements of UV-Vis and PL spectra, a Z-type scheme electron transport mechanism was deduced in the ZnO/Ag2CrO4 composite during photocatalytic process, by which the recombination of electron-hole pairs was inhibited, thus the lifetime of excitons was prolonged. Therefore, the photocatalytic efficiency of the composite was dramatically improved.
于富成, 南冬梅, 宋天云, 王博龙, 许博宇, 何玲, 王姝, 段红燕. ZnO/Ag2CrO4复合物的光催化降解特性及其Z型电子传输光催化机理[J]. 材料导报, 2020, 34(8): 8003-8009.
YU Fucheng, NAN Dongmei, SONG Tianyun, WANG Bolong, XU Boyu, HE Ling, WANG Shu, DUAN Hongyan. Photocatalytic Characteristics of ZnO/Ag2CrO4 Composite and Its Photocatalytic Mechanism with Z-scheme of Electron Transport. Materials Reports, 2020, 34(8): 8003-8009.
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2020, Vol. 34 
