RE/TiO_2用于NO_2^-光催化氧化的研究  

Study on Photocatalytic Oxidation of Nitrite over RE/TiO_2 Photocatalysts

作　　者：高远[1] 徐安武[1] 祝静艳[1] 刘汉钦[1] 

机构地区：[1]中山大学化学与化工学院,广州510275

出　　处：《催化学报》2001年第1期53-56,共4页

基　　金：国家博士点科研基金;国家博士后科研基金!资助项目 (970 5 5 80 7)

摘　　要：以稀土盐和钛酸丁酯为原料 ,采用溶胶 凝胶法制备了掺杂稀土光催化剂RE/TiO2 (RE =La ,Ce ,Er,Pr,Gd ,Nd ,Sm) ,并用XRD ,DRS和IR等手段对RE/TiO2 进行了表征 ;以NO-2 为目标降解物 ,考察了其光催化氧化活性 .结果表明 ,适量RE的掺入 ,可有效扩展TiO2 的光谱响应范围 ,有利于NO-2 的吸附 ,使光催化活性均有不同程度的提高 .其中掺杂Gd样品的光催化活性最高 .掺杂量是影响光催化活性的重要因素 ,一般最佳掺杂量为w(RE) ≈0 5 % .RE/TiO2 photocatalysts were prepared by using sol-gel method with rare earth (RE = La, Ce, Er, Pr, Gd, Nd, Sm) salts and titanium tetrabutoxide as precursors, and were characterized by XRD, IR, UV-Vis diffuse reflection techniques. The photocatalytic activity of the catalysts was tested with nitrite as objective decomposition substance. As a result, doping suitable content of rare earth elements can efficiently expand the range of light absorbed by the catalysts. At the same time, the doping can be beneficial to NO2- adsorption over the catalysts. Doping RE in TiO2 can, more or less, enhance the photocatalytic activity. Gd/TiO2 shows the highest catalytic activity among all the RE/TiO2 samples concerned. The doped RE content is an important factor for the photocatalytic activity; the optimum RE content is about 0.5%.

关 键 词：二氧化钛 稀土元素 掺杂 溶胶-凝胶法 亚硝酸根 光催化氧化 光催化剂 催化活性 

分 类 号：O643[理学—物理化学]