银修饰二氧化钛纳米材料光催化降解甲苯  

Photocatalytic degradation of toluene by silver modified titanium dioxide nanomaterials

作　　者：赵杰 赖苗 冯帅军 白雨洁 梁芯芯 ZHAO Jie;LAI Miao;FENG Shuai-jun;BAI Yu-jie;LIANG Xin-xin(School of Environmental Science and Engineering,Shaanxi University of Science&Technology,Xi'an 710021,China)

机构地区：[1]陕西科技大学环境科学与工程学院,陕西西安710021

出　　处：《陕西科技大学学报》2019年第1期82-88,共7页Journal of Shaanxi University of Science & Technology

基　　金：陕西科技大学自然科学预研基金项目(2017QNBJ-02)

摘　　要：Ag修饰TiO_2能显著提高光催化VOCs降解的效率,但其促进机制有待更加深入地认识.以水合肼为还原剂,制备出了不同负载量Ag修饰的TiO_2光催化剂,通过X-射线衍射、X-射线光电子能谱、光电流、氧吸附等对光催化剂进行了表征,并考察了光催化甲苯降解性能.结果表明:Ag掺杂不会改变TiO_2固有的结构,但减小了TiO_2表面的电子密度;Ag修饰增强了催化剂表面对O_2的吸附能力,促进了活性氧物种(如H_2O_2)的产生,进而加快了甲苯催化降解速率.Ag decorating Ti02 could significantly improve the efficiency of photocatalytic VOCs degradation,but the promotion mechanism needs to be further understood.In this paper,hydrated ruthenium was used as a reducing agent to prepare Ag/Ti02 photocatalysts with different Ag loadings.The photocatalysts were characterized by X-ray photoelectron spectroscopy,photocurrent,oxygen adsorption,etc.and the photocatalytic degradation of toluene was investigated.The results show that Ag doping does not change the inherent structure of Ti02 but reduces the surface electron density of Ti02.Moreover,Ag modification enhances the adsorption capacity of 02 on the surface of the catalysts,thereby promoting the generation of reactive oxygen species(such as H2O2),which gives rise to the accelerated toluene degradation.

关 键 词：二氧化钛 光催化 Ag修饰 甲苯降解 

分 类 号：X511[环境科学与工程—环境工程]