Positive roles of Br in g-C3N4/PTCDI-Br heterojunction for photocatalytic degrading chlorophenols
| Autor: | Jing Liu, Pengjing Chen, Liping Yang, Lipeng Zhai, Yanjie Wang, Diandian Han, Liwei Mi, Weihua Chen |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
General Chemical Engineering Heterojunction 02 engineering and technology General Chemistry Electron 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences Organic semiconductor chemistry.chemical_compound chemistry Diimide Photocatalysis Environmental Chemistry 0210 nano-technology Absorption (electromagnetic radiation) Perylene Visible spectrum |
| Zdroj: | Chemical Engineering Journal. 418:129492 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2021.129492 |
| Popis: | In order to efficient photocatalytic degradation of chlorophenols by organic semiconductor perylene tetracarboxylic diimide (PTCDI), two major issues need to be addressed, namely, poor visible light utilization and easy recombination of photogenerated electrons and holes. In this work, we aimed to overcome above issues by in-situ assembling brominated-PTCDI (PTCDI-Br) on g-C3N4 forming g-C3N4/PTCDI-Br heterojunction. It showed obvious visible-light absorption enhancement by the substitution of Br. Meanwhile, Br substitution made the conduction band of PTCDI-Br closer to the valence band of g-C3N4, resulting in the reduced interface electron transfer resistance and the increased internal-electric fields from g-C3N4 to PTCDI-Br, facilitating the interfacial charge transfer. Importantly, there was an enhancement of photocatalytic activity and stability when g-C3N4/PTCDI-Br was used as the photocatalyst for degrading 4-chlorophenol (4-CP) under UV–vis light irradiation. This finding offers new insight into the design strategy for PTCDI-based photocatalysts with excellent performance. |
| Databáze: | OpenAIRE |
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