纳米二氧化铈的可控形貌合成及其催化性能  

Morphology-controlled synthesis of nanoceria and its catalytic activity

作　　者：冯静 陈洪林[1] 张小明[1] FENG Jing;CHEN Honglin;ZHANG Xiaoming(Chengdu Institute of Organic Chemistry,Chinese Academy of Sciences,Chengdu Sichuan 610041,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院成都有机化学研究所,四川成都610041 [2]中国科学院大学,北京100049

出　　处：《化工环保》2018年第5期559-564,共6页Environmental Protection of Chemical Industry

摘　　要：二氧化铈(CeO_2)纳米颗粒的形貌会影响其表面氧空位浓度和化学吸附氧的能力,研究其形貌对催化臭氧氧化活性的影响有着重要意义。采用尿素和活性炭介导的水热合成方法制备了CeO_2纳米颗粒,结果表明,改变尿素和活性炭的添加量会改变最终获得的CeO_2颗粒的形貌,从而分别制得棒状、花状、立方状和球状的CeO_2颗粒。将不同形貌的CeO_2应用于水中草酸的催化臭氧氧化反应,结果表明,CeO_2纳米花(有序棒状结构)具有最好的催化臭氧氧化活性。加入0.5 g/L CeO_2纳米花,反应90 min后的草酸去除率达98%,较单独臭氧氧化提高63个百分点。加入10 mmol/L叔丁醇后,CeO_2纳米花的催化作用被完全抑制,证明其催化臭氧氧化为自由基反应。The morphology of ceria(CeO2)nanoparticles affects the concentration of oxygen vacancy and the chemical adsorption of oxygen on their surface.Therefore,it is important to study the effect of their morphology on the activity in catalytic ozonation.Nanoceria was prepared by hydrothermal methods mediated by urea and activated carbon.The results showed that the morphology of final particles could be changed by the amounts of urea and activated carbonand nanoceria in the form of rods,flowers,cubes and spheres could be obtained.The catalytic ozonation of oxalic acid in water showed that the morphology of nanoceria affected the catalytic activities and the flowers(ordered rods)had the best catalytic activity.After 90 min,98%of oxalic acid was removed by the ozonation catalyzed by 0.5 g/L nanoceria flowers,there was an increment of 63 percentage compared with single ozonation.After adding tert-butanol(10 mmol/L)to the process,the catalytic effect of nanoceria flowers was totally inhibited,thus their catalytic ozonation was proved to be a free radical reaction.

关 键 词：催化臭氧氧化 草酸 纳米二氧化铈 形貌可控合成 

分 类 号：X703.1[环境科学与工程—环境工程]