类单晶纳米片状WO<sub>3</sub>的制备及其光催化性能

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Abstract Pseudo-single crystal WO₃ nanosheets photocatalyst was prepared by regulating the reaction temperatures, pH and the ratios of precursors during the hydrothermal processes, and the morphologies, crystalline phases, compositions and charge carrier separation performance were characterized by XRD, SEM, TEM, XPS, UV-vis and photocurrent density test. The photocatalytic activity of WO₃ nanosheets for Rhodamine B degradation was studied under visible light irradiation. The results showed that monoclinic WO₃ nanosheets were obtained with thickness of ~10nm and side length of 300~500nm, moreover, the nanosheets were proved with continuous lattice structures, higher energy band structure and improved charge carrier separation property. Results of the photocatalytic experiments showed that the degradation process of Rhodamine B by WO₃ nanosheets followed first-order kinetic equation and the reaction rate constant was 2.91h^-1, which was 5.2 times higher than that of WO₃ nanoparticles (0.56h^-1). It was speculated that the better catalytic activity of WO₃ nanosheets was due to the higher charge carrier separation efficiency. Moreover, the experiment with scavengers under visible light irradiation proved that ·OH and ·O₂^- were both active free radicals in the process of pollutant degradation catalyzed by WO₃ nanosheets. The cycling test proved that the photocatalyst possessed good stability.

Key words： WO₃ nanosheets photocatalytic Rhodamine B

Received: 05 August 2020

PACS:

X703.5

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	Articles by authors
	LI Hou-fen
	XUE Shuai
	CAO Ya-jie
	YUE Xiu-ping
	ZHANG Ai-ming
	ZHOU Ai-juan
	WANG Su-fang

Cite this article:

LI Hou-fen,XUE Shuai,CAO Ya-jie等. Preparation of pseudo-single crystal WO₃ nanosheets and their photocatalytic performance[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(4): 1615-1623.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I4/1615

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