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Chemcial Industry and Engineering 2022, Vol. 39 Issue (5) :11-20    DOI: 10.13353/j.issn.1004.9533.20210383
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Preparation of MnWO4/WO3 and its photocatalytic performance
SHANG Zhenxiao, YUAN Jiayu, WANG Kaimei, LI Menghong
School of Resources and Environment Engineering, Shandong University of Technology, Shandong Zibo 255000, China

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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.
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SHANG Zhenxiao
YUAN Jiayu
WANG Kaimei
LI Menghong
KeywordsMnWO4/WO3   photocatalysis   oxygen production   tetracycline   separation efficiency     
Received 2021-06-21;
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SHANG Zhenxiao, YUAN Jiayu, WANG Kaimei, LI Menghong.Preparation of MnWO4/WO3 and its photocatalytic performance[J]  Chemcial Industry and Engineering, 2022,V39(5): 11-20
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