化工新型材料

化工新型材料 ›› 2024, Vol. 52 ›› Issue (12) : 251-256. DOI: 10.19817/j.cnki.issn1006-3536.2024.12.001

开发与应用

Ag-TiO₂/CNTs复合催化剂的制备及其光催化性能研究

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Preparation of Ag-TiO₂/CNTs composite catalyst and its photocatalytic properties

Wang Youjie^1,2, Wang Yuangang^1,2, Zhao Xianyi^1,3

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Received		Published
2023-09-19		2024-12-20
Issue Date	Revised Date
2024-12-12	2023-09-19

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摘要

为改善TiO₂催化剂的降解性能,扩大其在染料污水中的应用,采用化学还原结合溶胶-凝胶法合成了银-二氧化钛/碳纳米管(Ag-TiO₂/CNTs)复合催化剂,以质量浓度20mg/L亚甲基蓝(MB)溶液为目标污染物,考察了复合催化剂的光催化性能。使用Ag和碳纳米管(CNTs)共同对TiO₂进行改性,利用CNTs优异的导电性、吸附性和分散性,与Ag粒子协同作用,使得TiO₂的带隙减小,对可见光的利用范围增大,同时大幅度抑制了电子-空穴对的复合并增大了载流子的生成。通过X射线衍射仪、扫描电子显微镜、X射线光电子能谱仪、傅里叶变换红外光谱仪等对复合催化剂的微观形貌和结构进行了表征。结果表明,Ag掺杂量为0.7%(质量分数)时,Ag-TiO₂/CNTs复合催化剂比TiO₂拥有更长的光生载流子寿命和更强的可见光响应能力,在紫外光和可见光照射下均表现出极高的光催化活性,对MB的降解率达到99%左右。

Abstract

In order to improve the degradation performance of TiO₂ catalyst and expand its application in dye effluent,silver-titanium dioxide/carbon nanotubes (Ag-TiO₂/CNTs) composite catalyst was synthesised by chemical reduction combined with sol-gel method.The photocatalytic performance of the catalyst was investigated with a mass concentration of 20mg/L methylene blue (MB) solution as the target pollutant.The TiO₂ was modified using Ag and carbon nanotubes (CNTs) together,and the synergistic effect of the excellent conductivity,adsorption and dispersion of CNTs with Ag particles led to the decrease of the band gap of TiO₂ and the increase of the utilisation range of the visible light,as well as the substantial inhibition of electron-hole pair complexation and the increase of the carrier generation.The microscopic morphology and structure of the composite catalyst were characterised by X-ray diffractometer,scanning electron microscope,X-ray photoelectron spectrometer and Fourier transform infrared spectrometer.The results showed that the Ag-TiO₂/CNTs composite catalyst possessed longer photogenerated carrier lifetime and stronger visible light responsiveness than TiO₂ when Ag doping was 0.7% (mass fraction),and exhibited very high photocatalytic activity under both UV and visible light irradiation,with the degradation rate of MB reaching about 99%.

关键词

光催化 / 载流子 / 电子-空穴 / 光生电子

Key words

photocatalysis / charge carrier / electron-hole / photogenerated electron

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Ag-TiO₂/CNTs复合催化剂的制备及其光催化性能研究[J]. 化工新型材料, 2024, 52(12): 251-256 DOI:10.19817/j.cnki.issn1006-3536.2024.12.001

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