摘要：以硝酸铈和柠檬酸为原料,采用微波加热法制备纳米CeO₂粒子,采用X射线衍射仪和透射电镜对产物进行表征,考察纳米催化剂在太阳光下的光催化活性。结果表明,当微波功率为450 W,微波加热时间为60 s时,制备的样品为萤石型立方结构的纳米CeO₂粒子,平均粒径为19.62 nm;以纳米CeO₂为光催化剂对次甲基蓝溶液进行降解实验,当催化剂添加质量浓度为0.6 g/L时,日光照射120 min后次甲基蓝的脱色率为82%,较研磨法提高了21%。

关键词：纳米CeO₂；微波加热法；光催化

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