纳米二氧化铈的制备及光催化性能  

Preparation and photocatalytic performance of nano-ceria

作　　者：耿九光[1] 臧文杰[1] 李毅[1] 陶建强[1] 

机构地区：[1]长安大学材料科学与工程学院,陕西西安710064

出　　处：《化工进展》2014年第3期720-723,共4页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金项目(51108374)

摘　　要：介绍了一种以双氧水氧化硝酸铈[Ce(NO3)3],并用氨水沉淀制备纳米二氧化铈粉末(CeO2)的方法,用扫描电镜(SEM)观察了产物的颗粒形貌和粒度,分析了其制备过程中影响微观形态的因素。通过尾气降解试验装置研究了纳米CeO2对汽车尾气中的有害气体(HC、NOx)的光催化降解效能。结果表明:当Ce(NO3)3浓度为2.0 mol/L,氨水浓度为1.0 mol/L,选用乙醇和乙二醇为分散剂时,制备的球形纳米CeO2粒度在50 nm左右且分散性良好,对HC、NOx气体降解率可分别达12%和90%,具有良好的光催化性能。A facile route for the synthesis of nano cerium oxide powder （CeO2） is provided by the oxidation of cerium nitrate [Ce（NO3）3] with hydrogen peroxide and precipitation with ammonia. Factors influencing the size and morphology of the particle are analyzed. And the product is observed with a scanning electron microscope （SEM）. Exhaust degradation test device is designed to study the photocatalytic properties of nano-CeO2 in the degradation of harmful gases within the automobile exhaust （HC and NOx）. The results indicate that the ammonia concentration is 1.0 mol/L,with ethanol and ethylene glycol as dispersant,when the Ce（NO3）3 concentration is 2.0 mol/L,and the as-prepared nano-CeO2 is sphere-like nanoparticle aggregates with diameters around 50 nm and of good dispersibility,with which the degradation of HC and NOx amounts of 11% and 90% respectively, showing a good photocatalytic performance.

关 键 词：纳米材料 二氧化铈 氧化-沉淀法 光催化 尾气降解 

分 类 号：TQ133.3[化学工程—无机化工]