Enhanced photocatalytic performance of S-doped covalent triazine framework for organic pollutant degradation

IF 3.3 3区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Journal of Zhejiang University-SCIENCE A Pub Date : 2022-12-01 DOI:10.1631/2023.A2200440
Yi Shen, Jing-yu Hu, L. Lu, Chao Zhu, Qile Fang, Shuang Song
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引用次数: 9

Abstract

Photocatalysis using the abundant solar energy is an environmentally friendly and efficient way to degrade organic matter. Covalent triazine frameworks (CTFs), a new class of metal-free organic semiconductors responsive to visible light, are promising materials for water treatment. In this study, an original CTF, namely CTF-1, was modified by S-doping to form CTFSx, which were used as metal-free catalysts for degradation of methyl orange (MO) and bisphenol A (BPA). The outcomes demonstrated that the photocatalytic degradation of MO and BPA by CTFSx was superior to that by CTF-1, with better stability and reusability. Within 6 h, 53.2% MO and 84.7% BPA were degraded by CTFS5, and the degradation rate constants were 0.145 h−1 and 0.29 h−1, respectively, which were 3.6 and 5.8 times higher than those of CTF-1. Further investigation revealed that enhanced visible light absorption, a reduced degree of free carrier recombination, rapid separation and transfer of photogenerated electrons and holes, and improved ·OH oxidation capacity were important factors contributing to the significantly enhanced photocatalytic activity. The S-doping method effectively improved the light absorption performance, electronic structure, and modulation band structure of CTF-1. This work highlights the potential application of low-cost metal-free catalysts driven by visible light for the removal of organic pollutants from wastewater.
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s掺杂共价三嗪框架对有机污染物降解的光催化性能增强
利用丰富的太阳能进行光催化是一种既环保又高效的降解有机物的方法。共价三嗪框架(CTFs)是一类对可见光有响应的新型无金属有机半导体,是一种很有前途的水处理材料。本研究通过s掺杂对原CTF CTF-1进行改性,得到CTFSx,作为降解甲基橙(MO)和双酚A (BPA)的无金属催化剂。结果表明,CTFSx光催化降解MO和BPA的效果优于CTF-1,具有更好的稳定性和可重复使用性。在6 h内,CTFS5对MO的降解率为53.2%,对BPA的降解率为84.7%,降解速率常数分别为0.145 h−1和0.29 h−1,是CTF-1的3.6倍和5.8倍。进一步研究发现,可见光吸收增强、自由载流子复合程度降低、光电子和空穴的快速分离和转移以及·OH氧化能力的提高是光催化活性显著增强的重要因素。s掺杂方法有效地改善了CTF-1的光吸收性能、电子结构和调制带结构。这项工作强调了由可见光驱动的低成本无金属催化剂在去除废水中有机污染物方面的潜在应用。
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来源期刊
Journal of Zhejiang University-SCIENCE A
Journal of Zhejiang University-SCIENCE A 工程技术-工程:综合
CiteScore
5.60
自引率
12.50%
发文量
2964
审稿时长
2.9 months
期刊介绍: Journal of Zhejiang University SCIENCE A covers research in Applied Physics, Mechanical and Civil Engineering, Environmental Science and Energy, Materials Science and Chemical Engineering, etc.
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