Cu-Ce-TiO_2/膨润土光催化降解硝基苯废水性能研究  

Photocatalytic degradation nitrobenzene wastewater by Cu-Ce-TiO_2/bentonite

作　　者：刘梅[1] 王丽[1] 张志恒[1] 朱鹏飞[1] 张辉[1] 

机构地区：[1]西南石油大学化学化工学院,四川成都610500

出　　处：《应用化工》2017年第7期1243-1246,1250,共5页Applied Chemical Industry

基　　金：国家自然科学基金项目(21406184);西南石油大学2016年"青年实验技术人员过关"计划

摘　　要：采用沉淀法、溶胶-凝胶法和机械混合法制备了Cu-Ce-TiO_2/膨润土光催化剂,通过FTIR、XRD对其结构进行了表征,并考察了其光催化降解硝基苯废水的性能。结果表明,各催化剂中,TiO_2均以锐钛矿晶型存在,铜铈离子可能进入了TiO_2晶格,部分TiO_2进入了膨润土层间,使其层间距增大,实现了Cu-Ce-TiO_2与膨润土的复合。其中,溶胶-凝胶法制备的催化剂膨润土层间距更大,TiO_2与膨润土复合程度更高,光催化性能最好。当催化剂投入量为0.4 g/L,溶液pH为6时,在可见光下反应90 min后,该催化剂对20 mg/L硝基苯的降解率达96.3%,且其再生性良好。Cu-Ce-TiO2/bentonite composite photocatalysts were prepared by precipitation method,sol-gel method and mechanical mixing method. FTIR and XRD were employed to characterize the structure of the sample. The photocatalytic activity of Cu-Ce-TiO2/bentonite was investigated through treating nitrobenzene wastewater. The results showed that in the catalysts,Cu2＋ and Ce4＋may incorporate into TiO2 lattice and part of Ti4 ＋permeate into the interlayer of bentonite,which increase the basal spacing of the layers. Then the Cu-Ce-TiO2 and bentonite have been successfully composited. The layer spacing of the catalyst prepared by sol-gel method increases the most,and its compound degree is the best. Meanwhile,this catalyst exhibited highest photocatalytic activity from the experiment results of degradation of nitrobenzene wastewater. When the reaction time was 90 min under visible light irradiation,the dosage of catalyst was0. 4 g/L,p H value was 6 and the initial concentration was 20 mg/L,the degradation rate of nitrobenzene was up to 96. 3%. In addition,the catalyst could be reused efficiently.

关 键 词：Cu-Ce共掺杂 TIO2/膨润土 制备方法 光催化降解 硝基苯废水 

分 类 号：TQ426[化学工程] X703[环境科学与工程—环境工程]