Zn-TiO_2/累托石复合催化剂的制备及其光催化性能的研究  

Preparation and Photo-catalytic Property of Zn-doped TiO_2/rectories Nan-composite

作　　者：徐杰[1] 郑建东[1] 张华[1] 付凌晨[1] 凌俊[1] 

机构地区：[1]滁州学院材料与化学工程学院,安徽滁州239000

出　　处：《楚雄师范学院学报》2016年第9期16-22,共7页Journal of Chuxiong Normal University

基　　金：安徽省质量工程项目;项目编号:2014zjjh042;2015sjjd024;2015jxtd040;滁州学院校级规划项目;项目编号:2015GH17

摘　　要：以累托石、钛酸四丁酯和硝酸锌为原料,采用溶液-凝胶法合成了Zn-TiO_2/累托石复合催化剂。采用DSC/TG、XRD、BET比表面积分析对催化剂进行了表征。考察了Ti/累托石的比值、煅烧温度、锌的掺杂量对催化剂催化活性的影响,并对催化反应机理做了初步的探索。结果表明,复合催化剂的最佳煅烧温度为500℃;煅烧后,累托石的内部结构遭到一定程度的破坏。采用累托石作为载体时,煅烧温度不宜超过700℃。在煅烧温度为500℃,添加Zn.wt%=0.8,光照时间为90min时,酸性大红的降解率为100%。催化机理实验表明,酸性大红的降解可能为羟基氧化为主,超氧基氧化和抑制光生电子-空穴的重新复合为辅的共存氧化机理。Zn - doped TiO2/rectories nanocomposite were successfully synthesized by sol - gel method using rectories as supporter and Ti （OBu）4 and Zn （NO3 ）2 as raw material. There were characterized through X -ray diffraction, BET surface area and Thermogravimetric？ Analysis. The photocatalytic activity of the obtained nanocomposites were evaluated by degradation of acid scarlet 3 R and the effect of Zn doping concentration, calcinations temperature and Ti/rectories ratio on photocatalytic activity were studied.The results showed that the structure of rectories was destroyed to a certain extent. When doping with 0. 8% of Zn, calculating at 500℃ ,the catalysis exhibited the highest photocatalytic activity for degradation of acid scarlet 3R. The hydroxyl radical was the main active species and superoxide radicals, holes were the secondary active species for degradation of acid scarlet 3R.

关 键 词：累托石 二氧化钛 氧化锌 光催化 

分 类 号：TQ426.64[化学工程]