焙烧温度对BaTiO_(3)/Co_(3)O_(4)复合材料相组成、微观结构与催化性能的影响

Effect of calcination temperature on phase composition,microstructure and catalytic properties of BaTiO_(3)/Co_(3)O_(4) composites

目的 研究焙烧温度对BaTiO_(3)/Co_(3)O_(4)复合材料催化氧化性能的影响。方法 采用溶胶-凝胶法一步合成铁电BaTiO_(3)/Co_(3)O_(4)复合材料,并以有机染料亚甲基蓝(MB)氧化脱色为模型反应。利用XRD,SEM,EDS,XPS和紫外-可见分光光度计等表征手段研究焙烧温度对样品的相组成、微观形貌及催化氧化性能的影响。结果 随着焙烧温度的升高,BaTiO_(3)/Co_(3)O_(4)复合颗粒的晶粒尺寸逐渐增大,对MB的去除效率呈现出先增大后减小的变化趋势。结论 当焙烧温度为800℃时,所得样品为BaTiO_(3)/Co_(3)O_(4)复合材料,该复合材料对MB展现出较好的氧化降解性能,20 min去除率达到100%。

Purposes—To investigate the effect of calcination temperature on the catalytic oxidation properties of BaTiO_(3)/Co_(3)O_(4)composites.Methods—The ferroelectric BaTiO_(3)/Co_(3)O_(4)composites were synthesized with sol-gel method.With oxidative decolorization of organic dye methylene blue(MB)as a model reaction,the effects of calcination temperature on the phase composition,microstructure and catalytic oxidation properties of the samples were investigated via XRD,SEM,EDS,XPS and UV-VIS spectrophotometer.Results—With the increase of calcination temperature,the grain size of BaTiO_(3)/Co_(3)O_(4)composite particles gradually increased,and the removal efficiency of MB first increased and then decreased.Conclusions—When the calcination temperature reached 800℃,the obtained sample was pure BaTiO_(3)/Co_(3)O_(4)composite.The composite showed good oxidative degradation performance for MB,and the removal rate reached 100%in 20 min.