AgI/TiO_2催化剂的焙烧处理及其可见光催化活性  

CALCINATION AND VISIBLE-LIGHT PHOTOCATALYTIC ACTIVITY OF AgI/TiO_2 CATALYST

作　　者：曹静[1] 罗邦德[1] 林海莉[1] 王俊恩[1] 陈士夫[1] 

机构地区：[1]淮北师范大学化学与材料科学学院,淮北235000

出　　处：《环境化学》2011年第5期983-988,共6页Environmental Chemistry

基　　金：国家自然科学基金(No.20973071);安徽省"含能材料"省级重点实验室科研基金(KLEM2009013)资助项目

摘　　要：常温下以TiO2为载体,使用沉积-沉淀法合成了具有不同AgI负载量的AgI/TiO2复合光催化剂,并研究了焙烧处理对AgI/TiO2在可见光下(λ>420 nm)催化降解甲基橙(MO)的影响.结果表明,焙烧处理有效提高了AgI/TiO2的光催化性能,当焙烧温度高于200℃时,AgI/TiO2的光催化活性接近并达到最大值.当负载的AgI与TiO2的物质的量之比为0.15时,AgI/TiO2光催化降解MO的效率最高.XRD和UV-Vis测试表明焙烧处理提高了光敏组分AgI混晶中的γ相含量,拓宽了AgI/TiO2在可见光区的吸收范围,提高了光催化活性.AgI/TiO2 photocatalysts with different AgI loading were prepared by deposition-precipitation method in TiO2 dispersion at room temperature.The effect of calcination treatment on the photocatalytic activity of AgI/TiO2 for the degradation of methyl orange（MO） under visible light irradiation（λ〉420 nm） was investigated.The results showed that calcination treatment effectively improved photocatalytic property of AgI/TiO2.AgI/TiO2 showed the highest photocatalytic activity when the calcination temperature was above 200 ℃.The maximum photocatalytic degradation efficiency of MO with calcined AgI/TiO2 was obtained when the mole ratio of AgI to TiO2 was 0.15.XRD and UV-Vis characterization indicated that calcination treatment increased the percentage of γ phase in AgI mischcrystal and extended the absorbance in visible light region,which further improved the photocatalytic activity of AgI/TiO2.

关 键 词：可见光催化 甲基橙 AgI/TiO2 焙烧 

分 类 号：O643.36[理学—物理化学]