高含盐废水中TiO2复合光催化剂光降解甲基橙机制及性能

doi:10.13475/j.fzxb.20201200708

摘要/Abstract

摘要：

为深入分析盐离子对TiO₂基光催化剂降解有机物污染物过程的影响作用,通过空穴和自由基捕获剂的加入,研究了可见光激发下高含盐废水体系中光降解甲基橙的机制。在此基础上,探索了高含盐废水体系中TiO₂复合光催化剂对污染物降解性能提升的方法。结果表明:可见光激发催化剂形成的光生空穴是有机污染物降解的关键因素,废水体系中盐离子主要干扰体相中光催化反应;当有机污染物被大量吸附于催化剂表面时,盐离子的存在对光催化反应的干扰小;乙二醇热还原处理后的催化剂中Ti³⁺含量的增加,提升了催化剂的可见光响应和光催化活性;接枝于还原氧化石墨烯表面的少量乙二醇促进了催化剂对甲基橙的吸附,从而更有效地抵抗盐离子干扰。

关键词: 可见光激发光催化降解, TiO₂基光催化剂, 高含盐废水, 甲基橙, 光降解机制, 废水处理, 印染废水处理

Abstract:

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.

Key words: visible light-excited photocatalytic degradation, TiO₂-based photocatalyst, highly saline wastewater, methyl-orange, photo-degradation mechanism, wastewater treatment, printing and dying wastewater treatment

中图分类号:

O647

施敏慧, 李冰蕊, 王挺, 吴礼光. 高含盐废水中TiO₂复合光催化剂光降解甲基橙机制及性能[J]. 纺织学报, 2021, 42(12): 103-110.

SHI Minhui, LI Bingrui, WANG Ting, WU Liguang. Mechanism and performance of TiO₂ composite photocatalysts for photo-degradation of methyl-orange in highly saline wastewater[J]. Journal of Textile Research, 2021, 42(12): 103-110.

图/表 13

图1

表1

高含盐废水体系中不同捕获剂的加入对光降解甲基橙5 h去除率的影响"

废水体系	R₅/%
废水体系	无捕获剂	· $O 2 -$ 捕获剂 (对苯醌)	·OH捕获剂 (叔丁醇)	空穴捕获剂 (EDTA二钠)
纯水	91	86	70	48
0.2 mol/L硫酸钠	83	88	72	41
0.5 mol/L 硫酸钠	81	86	69	49

表1

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表2

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催化剂	Ti2p		O1s
催化剂	Ti³⁺	Ti⁴⁺	晶格氧	表面氧	吸附氧	C—O
Yb-TiO₂-RGO	8.6	91.4	11.5	18.4	27.0	43.1
Yb-TiO₂-RGO-160	10.2	89.8	12.1	21.6	28.1	38.2
Yb-TiO₂-RGO-170	14.7	85.3	11.8	23.7	27.8	36.7
Yb-TiO₂-RGO-180	9.2	90.8	13.6	25.8	23.1	37.5

高含盐废水中TiO₂复合光催化剂光降解甲基橙机制及性能

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

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