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—Vis DRS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Co^2+和Ti^4+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.