期刊
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
卷 95, 期 5, 页码 1476-1486出版社
WILEY
DOI: 10.1002/jctb.6338
关键词
KNbO3; nitrogen-deficient g-C3N4; photocatalysis; heterojunction; visible-light
类别
资金
- National Natural Science Foundations of China [21906072]
- Natural Science Foundation of Jiangsu Province [BK20190982]
- Zhangjiagang Science and Technology Support Program (Social Development) of Jiangsu Province, China [ZKS1510]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province (China) [KYCX19_1677, KYCX19_1706, SJKY19_2629, SJKY19_2658]
- Doctoral Scientific Research Foundation of Jiangsu University of Science and Technology (China) [1062931806, 1142931803]
BACKGROUND The formation of heterojunction is an effective mean for increasing the photocatalytic activity of single-phase semiconductor photocatalyst. RESULTS In this report, KNbO3/N-defected g-C3N4 (KNO/CNx) composites were prepared by an impregnation heat method. The optimized photocatalyst 3% KNO/CNx possesses excellent photocatalytic activity (100 mL, 10 mg/L; 84% degradation within 120 min) in the degradation of tetracycline (TC) under visible light (lambda > 420 nm), and it can reach about 125, 10.71 and 3.75 times the degradation kinetic constants, compared with KNO, CN, and CNx, respectively. Furthermore, 3% KNO/CNx possesses relatively high stability during the entire photoreaction process. CONCLUSION This enhanced photocatalytic activity of KNO/CNx is mainly ascribed to the synergistic effect between the heterojunction and defect engineering, which expand the visible-light adsorption and accelerate the separation efficiency of photo-induced electron-hole pairs. The research is expected to be used to improve the structure and properties of KNO-based composites, which provides a possibility for practical application of environmental restoration. (c) 2020 Society of Chemical Industry
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