Facile construction of Z-scheme g-C3N4/BiVO4 heterojunctions for boosting visible-light photocatalytic activity
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作者
Xu, Xinhe; Zhang, Jiayan; Tao, Feifei; Dong, Yali; Wang, Linxia; Hong, Tianjie
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刊物名称
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
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年、卷、文献号
2022, 279, 0921-5107
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关键词
Xu, Xinhe; Zhang, Jiayan; Tao, Feifei; Dong, Yali; Wang, Linxia; Hong, Tianjie
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摘要
Photocatalytic technology is one of the effective methods to treat the azo dye wastewater that has posed a serious threat to human environment and health. Composed of graphitic carbon nitride (g-C3N4) nanosheets and BiVO4 hollow spheres, the g-C3N4/BiVO4 composites were successfully assembled by thermal treatment. The uniform BiVO4 hollow spheres were more evenly scattered on the layered structure of g-C3N4 nanosheets, inhibiting the aggregation of nanoparticles. The confirmed g-C3N4/BiVO4 heterojunctions facilitate the transfer and separation of charges. Compared with g-C3N4 nanosheets and BiVO4 hollow spheres, the optimized g-C3N4/BiVO4 composite exhibits the significantly enhanced photocatalytic performance, owing to the formation of the heterojunctions, high charge separation efficiency and strong redox ability. The Z-scheme mechanism over the composite has been proposed to reveal the pathway of separation and transfer of the photo-generated charges in the MO degradation. The g-C3N4/BiVO4 heterojunctions with hollow porous structures could effectively enhance the photocatalytic degradation of pollutants.
