用水热还原法制备可见光响应TiO2光催化剂

doi:10.13475/j.fzxb.20180902108

摘要/Abstract

摘要：

为获得可见光下高效降解含盐废水中有机污染物的光催化剂,研究了水热还原法对商用TiO₂光催化剂(P25)的表面改性,制备出Ti³⁺掺杂的可见光响应光催化剂,并探索了水热还原法中条件变化对可见光下催化剂降解高含盐废水中甲基橙的影响规律。结果表明:水热还原过程不仅可以去除P25表面的氧化基团,且可以通过还原作用将TiO₂结晶态无序化形成异质结结构;TiO₂中Ti⁴⁺被还原后在催化剂中引入Ti³⁺拓展了催化剂的可见光响应范围,从而具备可见光催化活性;乙醇作为还原剂进行水热还原处理后,催化剂对甲基橙的降解活性最高,5 h的去除率可达95%,温和的水热还原过程也保证了催化剂的稳定性,在重复光降解实验中,该催化剂对甲基橙5 h去除率均超过90%。

关键词: 光催化剂, Ti³⁺自掺杂, 可见光响应, 水热还原改性, 废水处理, 甲基橙

Abstract:

Aiing at obtaining a visible-light-response photocatalyst with high contaminants removal in high-salinity wastewater, the surface modification for commercial titania (P25) photocatalyst were studied by hydrothermal reduction, and Ti³⁺ doped photocatalysts with visible light response were prepared. The influence of changing conditions in hydrothermal reduction on the photodegradation for methyl-orange in high-salinity wastewater using these catalysts was explored under irradiation of visible light. The results show that the hydrothermal reduction can not only remove some oxidized functional groups on the P25 surface, but also forms a heterojunction structure by reducing TiO₂ crystals to amorphous TiO₂. The introduction of Ti³⁺ into the catalyst by reducing Ti⁴⁺ in TiO₂ can expand the visible light response of the catalyst, thereby providing the catalytic activity excited by visible light. The activity of methyl orange of P25 modified by hydrothermal reduction using ethanol is the highest under the excitation of visible light, and the removal rate of 5 h for methyl-orange is up to 95%. In addition, the mild hydrothermal reduction process also ensures the catalyst stability, thus the removal rate of 5 h for methyl-orange exceeds 90% in the repeated photodegradation experiments.

Key words: photocatalyst, Ti³⁺ self-doping, visible light response, hydrothermal reduction modification, wastewater treatment, methyl orange

中图分类号:

O647

施小平, 李瑶, 潘家豪, 王挺, 吴礼光. 用水热还原法制备可见光响应TiO₂光催化剂[J]. 纺织学报, 2019, 40(10): 105-112.

SHI Xiaoping, LI Yao, PAN Jiahao, WANG Ting, WU Liguang. Preparation of visible-light-response TiO₂ photocatalyst by hydrothermal reduction[J]. Journal of Textile Research, 2019, 40(10): 105-112.

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催化剂	还原剂	还原方式
P25	—	—
H-P25	H₂	600 ℃还原
V-P25	抗坏血酸	水热还原
L-P25	柠檬酸钠	水热还原
G-P25	葡萄糖	水热还原
A-P25	乙醇	水热还原

催化剂	还原剂	催化剂中C的原子分数/%	Ti⁴⁺原子分数/%	Ti³⁺原子分数/%
P25	—	10.5	100	0
H-P25	H₂	8.3	0	100
V-P25	抗坏血酸	45.8	100	0
L-P25	柠檬酸钠	42.6	100	0
G-P25	葡萄糖	20.3	98.3	1.7
A-P25	乙醇	9.6	92.5	7.5

用水热还原法制备可见光响应TiO₂光催化剂

Preparation of visible-light-response TiO₂ photocatalyst by hydrothermal reduction

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