Fe^(3+)及Ce^(3+)掺杂对TiO_2纳米粒子性能的影响

Effects of Fe^(3+) and Ce^(3+) Doping on Properties of TiO_2 Nanoparticles

以溶胶-凝胶法制备纯的和分别掺杂Fe3+、Ce3+的TiO2纳米粒子,以橙黄IV的光催化氧化评价纳米粒子的紫外光与可见光活性,利用TG-DSC、XRD、BET及UV-Vis吸收光谱考察掺杂对TiO2的相变、粒径、比表面积及光吸收性能的影响,在归一化条件下探讨Fe3+及Ce3+掺杂对TiO2活性和表面性质产生影响的机制。结果表明:Fe3+及Ce3+的最佳掺杂量分别为0.2%和0.04%;Ce3+抑制TiO2由锐钛矿向金红石转变以及改善TiO2高温组织稳定性的能力均明显大于Fe3+;Fe3+和Ce3+掺杂均能提高TiO2的紫外光活性并扩展TiO2的光响应范围,但光生电子与空穴复合以及光腐蚀使它们对TiO2可见光活性的提高并不显著。Fe3+和Ce3+的半径及其相应氧化物的性质决定了两者对TiO2性能的不同影响。

Pure and Fe3+ , Ce3+ respectively doped TiO2 nanoparticles were prepared by sol -gel method. Photocatalytic oxidation of Orange IV was taken to evaluate UV and Vis light activity of nanoparticles. TG-DSC, XRD, BET and UV-Vis absorption spectra were employed to investigate the effects of doping on phase transformation, crystallite size, specific surface area and light absorption capacity of TiO2. Effect mechanisms of Fe3+ and Ce3+ doping on activity and surface property of TiO2 were discussed under the unifo...