RE/TiO2用于NO2-光催化氧化的研究

 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\r\n光催化剂RE／TiO2（RE＝La，Ce，Er，Pr，Gd，Nd，Sm），并用XRD，\r\nDRS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\r\n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\r\n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．\r\n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\r\n素，一般最佳掺杂量为w（RE）≈0．5％．

Study on Photocatalytic Oxidation of Nitrite over RE/TiO2 Photocatalysts

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 we re characterized by XRD,IR,UV-Vis diffuse reflection techniques. The photocatal ytic activity of the catalysts was tested with nitrite as objective decompositio n substance. As a result, doping suitable content of rare earth elements can eff iciently expand the range of light absorbed by the catalysts. At the same time, the doping can be beneficial to NO-2 adsorption over the catalysts. Doping R E in TiO2 can, more or less, enhance the photocatalytic activity. Gd/TiO2 sh ows the highest catalytic activity among all the RE/TiO2 samples concerned. Th e doped RE content is an important factor for the photocatalytic activity; the o ptimum RE content is about 0.5%.