期刊
CHINESE JOURNAL OF CATALYSIS
卷 42, 期 3, 页码 450-459出版社
SCIENCE PRESS
DOI: 10.1016/S1872-2067(20)63674-9
关键词
Thiophene; g-C3N4; Lone pairs on sulfur; n-pi* Transition; Visible light photocatalysis
资金
- National Natural Science Foundation of China [21777063]
- China Postdoctoral Science Foundation [2017M621654]
- Natural Science Foundation of Jiangsu Province [BK20180887]
A novel approach of introducing thiophene groups to expand the optical absorption range of graphitic carbon nitride photocatalysts was reported in this study, enhancing photocatalytic activity for the degradation of bisphenol A and generation of H-2.
Expanding the optical absorption range of photocatalysts is still a key endeavor in graphitic carbon nitride (g-C3N4) studies. Here, we report on a novel thiophene group extending the optical property, which is assigned to n-pi* electronic transitions involving the two lone pairs on sulfur (TLPS). The as-prepared samples, denoted as CN-ThA(x) (where x indicates the amount of ThA added, mg), showed an additional absorption above 500 nm as compared to pristine g-C3N4. Further, the thiophene group enhanced charge carrier separation to suppress e(-)/h(+) pair recombination. The experimental results suggest that the thiophene group can obstruct the polymerization of melem to generate a large plane, thus exposing the lone electron pairs on the sulfur. The photocatalytic activity was evaluated in the decomposition of bisphenol A and H-2 evolution. Compared with g-C3N4, the optimized CN-ThA30 sample led to a 6.6- and 2-fold enhancement of the degradation and H-2 generation rates, respectively. The CN-ThA30 sample allowed for synchronous H-2 production and BPA decomposition. (C) 2021, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
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