ZnO/Ag<sub>2</sub>CrO<sub>4</sub>复合物的光催化降解特性及其Z型电子传输光催化机理

doi:10.11896/cldb.19050190

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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.

Key words： hydrothermal method La-doped zinc oxide nanorod silver chromate nanosheets photocatalysis

Published: 25 April 2020

CLC number:

TB34

Fund:This work was financially supported by the National Natural Science Foundation of China (51665028), the Natural Science Foundation of Gansu Pro-vince, China (1506RJZA107),Enterprises and the Institutions Entrust Scientific and Technological Projects (LZSN-KJ-002, 2018040-G, ky2019047).

About author:: Fucheng Yu, as an associate professor in the School of Materials Science and Engineering, Lanzhou University of Technology, graduated from Chungnam National University in Korea for the Ph.D. degree in July 2008. The current research field is the preparation and application of functional nano-film and nano-structural materials of semiconductor. Published 30 papers on SCI and EI papers.

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	YU Fucheng
	NAN Dongmei
	SONG Tianyun
	WANG Bolong
	XU Boyu
	HE Ling
	WANG Shu
	DUAN Hongyan

Cite this article:

YU Fucheng,NAN Dongmei,SONG Tianyun, et al. Photocatalytic Characteristics of ZnO/Ag₂CrO₄ Composite and Its Photocatalytic Mechanism with Z-scheme of Electron Transport[J]. Materials Reports, 2020, 34(8): 8003-8009.

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http://www.mater-rep.com/EN/10.11896/cldb.19050190 OR http://www.mater-rep.com/EN/Y2020/V34/I8/8003

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