摘要：本论文以乙酸铈(Ce(CH3CO2)3)，乙酸镨(Pr(CH3CO2)3)为原料，以三嵌段共聚物聚P123为模板，利用溶剂挥发自组装的方法合成了一系列具有高活性的介孔CeO2及CeO1-xPrxO2粉体。利用X射线衍射(XRD)，能谱(EDS)，红外分析(FT-IR)，透射电镜(TEM)及氮气脱吸附等手段对材料进行分析和表征。并且对粉体催化降解染料废水进行研究，讨论影响有机废水降解率的因素。
结果表明，以乙酸铈为原料，P123为模板，在煅烧温度为400℃的条件下，可以获得比表面积达135m2/g的介孔CeO2，孔径分布范围2-4nm。在介孔Ce1-xPrxO2的合成过程中，随着镨掺杂量的增加，Ce1-xPrxO2的比表面积不断增大，对酸性品红染料废水的催化降解能力不断提高。当乙酸铈和乙酸镨的摩尔比为5:5时，合成产物对酸性品红表现出优良的催化降解效果，在250min时降解率可以达到100%。
关键词：介孔；CeO2；CeO1-xPrxO2；催化降解
Abstract: Mesoporous CeO2 and Ce1-xPrxO2 powders with highly active were synthesized via a evaporation-induced self assembly(EISA) method with cerium acetate hydrate (Ce(CH3CO2)3) and praseodymium acetate hydrate (Pr(CH3CO2)3) as starting materials and triblock copolymer P123 as templates. XRD, EDS, FT-IR, TEM and BJH techniques were used to analyze and characterize the samples. And studied on the catalytic degradation of dyeing wastewater with powders, then discussed the impact of organic wastewater degradation rate factors.
The results showed that mesoporous CeO2 with specific surface area of 135m2/g, pore size ranged from 2 to 4 nm was obtained under the condition as follows: cerium acetate hydrate as starting materials, P123 as templates and the calcination temperature was 300℃. Specific surface area rise with increasing of doping content of Pr during the process of synthesize mesoporous Ce1-xPrxO2, and increasing the ability of the catalytic degradation of acid fuchsin dyeing wastewater. For acid fuchsin, synthetic products exhibited excellent catalytic degradation effect when x is 0.5, and the degradation rate could reached 100% in 250 minutes.
Key words：mesoporous；CeO2；Ce1-xPrxO2；catalytic degradation
