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以钛酸四丁酯为钛源,醋酸铈为铈源,采用溶胶-凝胶法制备了掺铈的纳米TiO2。用X射线衍射和透射电子显微镜对材料进行了表征,以掺铈TiO2为催化剂对甲基橙进行了光催化降解实验。考查了催化剂掺铈量、催化剂总用量、甲基橙溶液浓度及降解时间对甲基橙降解率的影响。结果表明,制得的样品颗粒细小均匀,3%掺铈TiO2样品比表面积高达120.2 m2.g-1。掺铈TiO2中的铈钛原子摩尔比以及催化剂用量均影响光催化活性,铈的掺杂量为3%时,纳米TiO2光催化活性最高,3%掺铈TiO2催化剂最佳用量为0.3 g/L。降解率随甲基橙初始浓度的增加而降低,随光照降解时间的增加而提高,光照20 min～30 min之间,降解速度最快。
Titanium tetrabutoxide was used as titanium source and cerous acetate as cerium source. Cerium doped nano-TiO2 was prepared by sol-gel method. The materials were characterized by X-ray diffraction and transmission electron microscopy. The photocatalytic degradation of methyl orange with cerium-doped TiO2 as catalyst was studied. The effects of catalyst cerium content, total catalyst dosage, methyl orange solution concentration and degradation time on the degradation rate of methyl orange were investigated. The results show that the prepared sample particles are fine and uniform, and the specific surface area of 3% cerium-doped TiO2 sample is as high as 120.2 m2.g-1. The molar ratio of cerium to titanium in cerium-doped TiO2 and the amount of catalyst both affected the photocatalytic activity. When the doping amount of cerium was 3%, the photocatalytic activity of nanosized TiO2 was the highest, and that of 3% cerium-doped TiO2 was 0.3 g / L . Degradation rate decreased with the increase of initial concentration of methyl orange, and increased with the increase of light degradation time. The light degradation rate was the fastest between 20 min and 30 min.