Abstract： To obtain La-Co-Mn ultrafine particles and research influence of Mn-doping dosage on the structure, morphology and photocatalytic ability of them, the target particles were synthesized using so1-gel method combining with the vacuum drying technology. The products were characterized by TG -DSC, XRD and TEM. The catalysis activities were evaluated in the degradation reaction of methyl orange under UV lights. The results show that the spherical particles with size between 30 and 50 nm can be gained by thermal treating at 850 ℃, which are mainly composed of LaMn_xCo_1-xO₃ and La₂O₃. Mn³⁺ together with Co³⁺ occupies B sites in the lattice. Oxygen number is related to the Mn-doping dosage. When the Mn-doping molar fraction x equals 0.3, the number of oxygen vacancies is rather large in crystal lattice of LaMn_xCo_1-xO₃, and the photocatalytic activity is rather high.

Keywords: ultrafine particle; preparation; structure; photocatalytic; rare earth

中图分类号：TQ133.3        文献标志码：A

文章编号：1008-5548( 2015)03-0021-04

DOI:10.13732/j.issn.1008-5548.2015.03.005

收稿日期：2014-06-20， 修回日期：2014-07-19，在线出版时间：2015-06-24。

基金项目：国家级大学生创新创业训练计划项目，编号：201210488007；湖北省重点实验室煤转化与新型炭材料 2013 年度开放基金项目， 编号：WKDM201308。

第一作者简介：陈阳（1976—），女，博士研究生，讲师，研究方向为清洁能源、光催化。 电话：13971225127，E-mail ：66472494@qq.com。