Abstract: Using cerium nitrate and citric acid as raw materials, nanometer CeO₂ particles were prepared by microwave heating method. XRD and TEM were used to characterize the products. Activities of prepared nano-photocatalysts were investigated under sunlight. The results show that the prepared samples are fluorite cubic nanometer CeO₂ particles with the particle size of 19.62 nm when the microwave power is 450 W and the heating time is 60 s. Photodegradations of methylene blue in an aqueous solution is studied taking nanometer CeO₂ particles as photocatalyers. After 120 min illumination, the decolorization rate of the methylene blue is 82% when using catalysts with mass concentration of 0.6 g/L, which is higher by 21% than that with CeO₂ particles prepared by milling method.

Keywords: nanometer CeO₂ particles; microwave heating method; photocatalysis

中图分类号：O643.3 文献标志码：A

文章编号：1008-5548(2014)01-0051-04

DOI:10.3969/j.issn.1008-5548.2014.01.012

收稿日期：2013-06-05， 修回日期：2013-08-28，在线出版时间：2014-02-24。

基金项目：辽宁省自然科学基金项目，编号：20011521。

第一作者简介：黄新玉（1988—），女，硕士研究生，研究方向为纳米材料的合成及应用。 E-mail: huangyu_3490@126.com。

通信作者简介：李丽华（1964—），女，博士，教授，研究方向为新型材料应用。 电话：13898312696， E-mail: llh72@163.com。