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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。
PS / CeO 2 composite particles were prepared by using polystyrene microspheres as template, then the PS core was removed by calcination to form hollow CeO 2 nanospheres. Finally, the shell thickness of the hollow spheres was controlled by controlling the concentration of cerium nitrate in the reaction solution. TEM, FESEM, SAED, FTIR, DLS and other means, the phase structure, morphology and particle size distribution of the prepared samples were characterized. The results show that the diameter of hollow sphere of CeO_2 is about 200 nm, the outer diameter is about 230-260 nm, the shell thickness is about 15, 20, 25 and 30 nm, respectively. The hollow sphere shell consists of a large number of nano- CeO 2 particles formed by close packing. Catalyzed by CeO 2 hollow sphere catalyzed ozone oxidation for 2 h, the degradation rate of phenol up to 95%.