MnWO<sub>4</sub>/WO<sub>3</sub>的制备及其光催化性能的研究

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摘要光催化技术在解决环境污染和能源危机方面有着巨大的应用潜力,采用浸渍、焙烧的方法制备了一系列MnWO₄含量不同的MnWO₄/WO₃复合光催化剂。利用XRD、SEM、TEM、HR-TEM、BET等方法对MnWO₄/WO₃复合光催化剂的结构形貌进行表征。通过光催化分解水产氧以及降解四环素来评价其光催化活性。通过能带结构、表面光电压(SPV)、荧光(PL)和活性物种实验分析MnWO₄/WO₃复合光催化剂的光催化活性增强机制。实验结果表明,所有MnWO₄/WO₃样品的光催化活性较纯WO₃样品都有提高,且随着MnWO₄含量的增加呈现先增高后下降的趋势,MnWO₄含量为3%的MnW-2样品表现出最优的光催化活性,其氧气产量为89.26 μmol,为WO₃纯样的3.45倍,对四环素的降解率达到了92.1%,一级反应动力学常数为WO₃纯样的8.98倍。通过对其能带结构及光生电子和空穴的分离效率进行分析发现,样品的光催化活性变化主要是由于光生载流子分离效率改变导致。

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	尚贞晓
	袁佳钰
	王凯玫
	李梦红

关键词： MnWO₄/WO₃ 光催化产氧四环素分离效率

Abstract： Photocatalytic technology has showed great potential in environmental remediation and clean energy production. Herein, a series of MnWO₄/WO₃ composite photocatalysts with different contents of MnWO₄ were prepared by impregnation and calcination method. The structure and morphology of MnWO₄/WO₃ composite photocatalysts were characterized by XRD, SEM, TEM, HR-TEM and BET. The photocatalytic activity was evaluated by photocatalytic oxygen evolution from water decomposition and degradation of tetracycline. The enhanced photocatalytic activity mechanism of MnWO₄/WO₃ composite photocatalysts was analyzed by energy band structure, SPV, PL, and active species experiment. In the experiments of oxygen evolution from water spliting and degradation of organic pollutants, the photocatalytic activity of all MnWO₄/WO₃ samples was higher than that of pure WO₃, with the increase of MnWO₄ content, photocatalytic activity showed a trend of increasing firstly and then decreasing, MnW-2 sample with 3% MnWO₄ content exhibited the best photocatalytic performance. 89.26 μmol O₂ was produced in 6 h under simulated sunlight irradiation, which was 3.45 times as much as that of pure WO₃. The degradation rate of tetracycline reached 92.1%, and its first-order inetic constants were 8.98 times of pure WO₃. Through the analysis of the energy band structure and the separation efficiency of photogenerated electrons and holes, it is found that the change of photocatalytic activity of MnWO₄/WO₃ samples is mainly caused by the varying of the separation efficiency of photogenerated carriers.

Keywords： MnWO₄/WO₃ photocatalysis oxygen production tetracycline separation efficiency

Received 2021-06-21;

Fund:国家自然科学基金项目(41771348)。

Corresponding Authors: 尚贞晓,讲师,E-mail:understand27@163.com。 Email: understand27@163.com

About author: 尚贞晓(1980-),男,博士,主要研究方向为环境功能材料研究、土壤污染修复。

引用本文:

尚贞晓, 袁佳钰, 王凯玫, 李梦红.MnWO₄/WO₃的制备及其光催化性能的研究[J]. 化学工业与工程, 2022,39(5): 11-20

SHANG Zhenxiao, YUAN Jiayu, WANG Kaimei, LI Menghong.Preparation of MnWO₄/WO₃ and its photocatalytic performance[J]. Chemcial Industry and Engineering, 2022,39(5): 11-20

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