Mechanism and performance of TiO2 composite photocatalysts for photo-degradation of methyl-orange in highly saline wastewater

被引：0

作者：

Shi M. ^{[1
]}

Li B. ^{[1
]}

Wang T. ^{[1
]}

Wu L. ^{[1
]}

机构：

[1] School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou

来源：

Fangzhi Xuebao/Journal of Textile Research | 2021年 / 42卷 / 12期

关键词：

Highly saline wastewater; Methyl-orange; Photo-degradation mechanism; Printing and dying wastewater treatment; TiO[!sub]2[!/sub]-based photocatalyst; Visible light-excited photocatalytic degradation; Wastewater treatment;

D O I：

10.13475/j.fzxb.20201200708

中图分类号：

学科分类号：

摘要：

To deeply understand the effect of salt ions on the degradation of organic pollutants by using TiO2-based photocatalysts, the photo-degradation mechanism for methyl-orange in high saline wastewater systems irradiated by visible light was explored, via the addition of holes and free radical traps. The results show that the photo-generated holes formed by the catalyst plays a key role on the degradation for organic pollutants. In the high saline wastewater system, salt ions mainly interferes with the photocatalytic reaction in the bulk phase. When large amount of the organic pollutants are adsorbed on the catalyst surface, the presence of salt ions in the bulk phase has little interference with the photocatalytic reaction, and the increase of Ti3+ content in the catalyst after ethylene glycol thermal reduction treatment improves both the visible light response and the catalyst activity. A small amount of ethylene glycol grafted on the surface of reduced graphene oxide promotes the adsorption of methyl-orange on the catalyst surface, thereby more effectively resisting the interference of salt ions. © 2021, Periodical Agency of Journal of Textile Research. All right reserved.

引用

页码：103 / 110

页数：7

共 20 条

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