Ag-TiO_(2)/CNTs复合催化剂的制备及其光催化性能研究  

Preparation of Ag-TiO_(2)/CNTs composite catalyst and its photocatalytic properties

作　　者：王有杰 王远港 赵显一 Wang Youjie;Wang Yuangang;Zhao Xianyi(School of Chemistry and Materials Engineering,Bohai University,Jinzhou 121013;Liaoning Provincial Key Laboratory of Surface Functionalization of Titanium Dioxide Powder,Jinzhou 121013;Jinzhou Chensheng Technology Co.,Ltd.,Jinzhou 121013)

机构地区：[1]渤海大学化学与材料工程学院,锦州121013 [2]辽宁省二氧化钛粉体表面功能化重点实验室,锦州121013 [3]锦州晨晟科技有限公司,锦州121013

出　　处：《化工新型材料》2024年第12期251-256,262,共7页New Chemical Materials

基　　金：国家自然科学基金(21878024);锦州市指导性科技计划项目(JZ2020B032)。

摘　　要：为改善TiO_(2)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-TiO_(2)/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TiO_(2)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TiO_(2)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-TiO_(2)/CNTs复合催化剂比TiO_(2)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。In order to improve the degradation performance of TiO_(2)catalyst and expand its application in dye effluent,silver-titanium dioxide/carbon nanotubes(Ag-TiO_(2)/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 TiO_(2)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 TiO_(2)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-TiO_(2)/CNTs composite catalyst possessed longer photogenerated carrier lifetime and stronger visible light responsiveness than TiO_(2)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 

分 类 号：TQ426[化学工程] O643.36[理学—物理化学]