复合催化剂Fe／ZnO-TiO2的制备及其光催化活性  

Preparation of composite photocatalyst Fe/ZnO-TiO_2 and its photocatalytic activity

作　　者：李翠霞[1,2] 杨志忠[1] 顾玉芬[1] 林焰[1] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料重点实验室,甘肃兰州730050 [2]天津大学材料科学与工程学院,天津300072

出　　处：《兰州理工大学学报》2008年第5期28-31,共4页Journal of Lanzhou University of Technology

基　　金：甘肃省自然科学基金(3ZS042-B25-001)

摘　　要：采用柠檬酸溶胶自燃烧法制备粒径为12～48nm的复合催化剂Fe／ZnO-TiO2及纯TiO2粉体．用XRD、TEM对其进行表征，研究Fe^3＋、Zn^2＋的加入、柠檬酸的加入量、燃烧合成温度对粉体组成、结构的影响．以甲基橙为模型污染物，测试其光催化活性．结果表明，锐钛矿型向金红石型转变的临界温度为500～600℃．当Ti（OBu）4与柠檬酸的摩尔比为9：12，合成温度为550℃时，复合催化剂的主晶相为金红石型TiO2，并有少量锐钛矿相和Zn-TiO3．其光催化降解甲基橙效率最高，可达95％以上。Composite photocatalysts Fe/ZnO-TiO2 with 12～48 nm in grain size and pure titanium dioxide powder were prepared with self-combustion process of citric acid sol. The structure and morphology of the materials were characterized by using XRD and TEM. The influence of the addition of Fe^3＋ and Zn^2＋, citric acid volume and reaction temperature on the composition and structure of powders was analyzed. Their photocatalytic activity was tested by taking the methyl orange as a pollutant on the model. The result showed that the critical temperature for the crystal transfer from anatase-type TiO2 to rutile-type of TiO2 was 500～600 ℃. When the molar ratio of Ti（OBu）4 to citric acid was 9 ： 12 and the synthesis temperature was 550℃, the main crystal phase of the composite catalyst would be futile-type TiO2 with small amount of anatase phase and ZnTiO2, and its efficiency of photocatalytic degradation of methyl orange would be maximal, amounting to above 95%.

关 键 词：光催化 复合催化剂 自燃烧法 甲基橙 

分 类 号：TB34[一般工业技术—材料科学与工程]