Fabrication of visible-light-response face-contact ZnSnO3@g-C3N4 core–shell heterojunction for highly efficient photocatalytic degradation of tetracycline contaminant and mechanism insight
2021
Zhu, Xiufeng | Guo, Feng | Pan, Jingjing | Sun, Haoran | Gao, Lingling | Deng, Jingxiao | Zhu, Xunyi | Shi, Weilong
The large-scale consumption and discharge of antibiotic tetracycline (TC) urge us to search for a highly efficient and eco-friendly technology to remove it. In this work, face-contact ZnSnO₃@g-C₃N₄ core–shell heterojunction was successfully constructed via one-step calcination route. The experimental data indicate that the photocatalytic TC removal performance of ZnSnO₃@g-C₃N₄ (1:3) reaches 90.8% within 120 min under the same condition compared with bulk g-C₃N₄ (32% degradation) and ZnSnO₃ (9% degradation). The improved photocatalytic activity is ascribed to the formation of core–shell structure between ZnSnO₃ and g-C₃N₄ which not only enlarges visible light response but also effectively separates electron–hole pairs. Meanwhile, this face-contact ZSO-CN photocatalyst displays much more contact interfaces than the point-contact ZSO-CN photocatalyst, and the contact interfaces could play the part of efficient channels for charge transfer. Finally, the photocatalytic reaction mechanism on ZnSnO₃@g-C₃N₄ was also stated at length through active species capture and electron spin resonance (ESR) tests. And the possible intermediates products were discussed through the liquid chromatography–mass spectrometry (LC–MS) analysis.
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