多形貌TiO2的制备及其光催化降解四环素的性能研究

摘要/Abstract

摘要： 光催化是目前处理四环素(TC)污染物中的一种重要方法,而在这个过程中光催化材料是关键。TiO₂作为常用的光催化剂,其形貌会极大地影响催化性能。本文采用水热法分别制备了海胆状(TiO₂-U)、纳米颗粒(TiO₂-N)和中空管状(TiO₂-T)的TiO₂,利用XRD、SEM、XPS、UV-Vis DRS、N₂吸附-脱附和EPR等表征手段分析了所制备催化剂的形貌结构,并研究了它们对TC的降解性能。结果表明,TiO₂-U中含有的缺陷最多,其中的阳离子缺陷和阴离子缺陷协同作用使TiO₂-U禁带宽度变窄,因此表现出最好的光催化活性。在光照60 min时TiO₂-U催化TC的降解率可达100%。此外,TiO₂-U独特的海胆状结构,使其具有较大的比表面积,从而有利于TC的吸附,提高降解效率。

关键词: 二氧化钛, 形貌, 光催化降解, 四环素, 催化活性

Abstract: Photocatalysis is an essential approach for treating tetracycline (TC) contaminants, and photocatalytic materials play a crucial role in this process. TiO₂ is a widely used photocatalyst, its morphology will significantly affect its catalytic performance. Therefore, urchin-like (TiO₂-U), nanoparticle (TiO₂-N) and hollow tubular (TiO₂-T) TiO₂ were prepared by hydrothermal method in this paper. The morphology and structure of the prepared catalysts were analyzed by XRD, SEM, XPS, UV-Vis DRS, N₂ adsorption-desorption and EPR, and their degradation performance of TC were investigated. The results show that TiO₂-U contains the greatest number of defects, and the synergistic effect of cationic and anionic defects narrow the band gap of TiO₂-U, which reveal the best catalytic activity. The degradation rate of TC by TiO₂-U can reach 100% at illumination 60 min. In addition, TiO₂-U has a large specific surface area due to its distinctive urchin-like structure, which is conducive to the adsorption of TC and enhances the degradation efficiency.

Key words: titanium dioxide, morphology, photocatalytic degradation, tetracycline, catalytic activity

中图分类号:

O644.1

李霞, 姚梦琴, 刘飞. 多形貌TiO₂的制备及其光催化降解四环素的性能研究[J]. 人工晶体学报, 2024, 53(12): 2181-2188.

LI Xia, YAO Mengqin, LIU Fei. Preparation of Multi-Morphology TiO₂ and Its Photocatalytic Degradation of Tetracycline[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2024, 53(12): 2181-2188.

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多形貌TiO₂的制备及其光催化降解四环素的性能研究

Preparation of Multi-Morphology TiO₂ and Its Photocatalytic Degradation of Tetracycline

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