ABO_3型钙钛矿结构的可见光光催化剂LaCo_(0.5)Ti_(0.5)O_3的设计与合成  

Design and Synthesis of a Visible Light Driven Photocatalyst LaCo_(0.5)Ti_(0.5)O_3 with ABO_3-type Perovskite Structure

作　　者：杨立滨[1] 井立强[1] 李姝丹[1] 蒋保江[1] 付薇[1] 付宏刚[1] 

机构地区：[1]黑龙江大学化学化工与材料学院物理化学实验室

出　　处：《高等学校化学学报》2007年第3期415-418,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20301006;20431030;20501007);黑龙江省自然科学基金(批准号:ZJG04-04;B0305);哈尔滨市青年科学基金(批准号:2005AFQXJ060)资助

摘　　要：采用溶胶-凝胶法在较低温度条件下设计合成了新型的具有ABO3型钙钛矿结构的三元金属复合氧化物LaCo0.5Ti0.5O3.通过TG-DTA,XRD,XPS,UV-VisDRS等测试技术和可见光光催化活性测试对其进行了表征.结果表明,与LaCoO3和La2Ti2O7相比,LaCo0.5Ti0.5O3样品表现出相对较高的可见光光催化活性,并且合成温度较低.这是由于原料中的Co2+和Ti4+离子通过电荷补偿作用使产物B位的两种金属均以+3价氧化态分布所致.A novel ternary metal complex oxide, LaCo0.5Ti0.5O3, with ABO3-type perovskite structure was designed and synthesized by a sol-gel method at relatively low temperature, and were characterized by means of several testing techniques such as TG-DTA, XRD, XPS and UV-Vis DRS spectra. The results show that, compared with LaCoO3 and La2Ti2O7, the as-prepared sample exhibits a higher photocatalytic activity under visible light irradiation, and can be obtained at lower temperature. It can be proposed that the charge compensation effects make Co^2＋ and Ti^4＋ ions in raw material co-occupy uniformly B site in perovskite both as the forms of ＋ 3 valence, which is responsible for the lower temperature synthesis.

关 键 词：钙钛矿 LaCo0.5Ti0.5O3 溶胶-凝胶法 可见光光催化 

分 类 号：O614[理学—无机化学] O643.36[理学—化学]