可控壳厚纳米CeO_2中空球的制备、表征及其催化氧化性能

Preparation,Characterization and Catalytic Oxidation Performance of CeO_2 Hollow Microspheres with Controlled Shell Thickness

以聚苯乙烯微球为模板制备PS/CeO_2复合颗粒,再通过煅烧去除PS内核形成CeO_2纳米中空球,并通过控制反应液中硝酸铈的浓度来最终控制中空球的壳厚。用TEM、FESEM、SAED、FTIR、DLS等手段,对所制备样品的物相结构、形貌和粒径分布进行了表征。结果表明,CeO_2中空球内径约为200 nm,外径约为230-260 nm,壳厚分别约为15、20、25和30 nm,中空球壳层由大量粒径为5-10 nm的纳米CeO_2颗粒紧密堆积所组成。经CeO_2中空球催化臭氧氧化处理2 h后,对苯酚的降解率可达95%以上。

CeO_2 hollow microspheres with controlled shell thickness were synthesized via a simple polystyrene sphere template method.The as-synthesized products were characterized by TEM,FESEM, SAED,FTIR and DLS.The degradating performance of the CeO_2 hollow microspheres on phenol was investigated.The results indicate that the CeO_2 hollow microspheres with the external diameter approximately of 230-260 nm and the internal diameter of 200 nm possess thin shell composed of loosely packed CeO_2 nanoparticles（particle diameter of 5-10 nm）.The shell thickness of CeO_2 hollow microspheres can be controlled from 15 to 30 nm by adjusting the concentration of Ce（NO_3）_3·6H_2O in the reaction solution. The degradation rate of CeO_2 hollow microspheres can reach to 95%for the phenol.