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用沸腾回流直接水解法制备了粒径为25～35nm纯锐钛矿型纳米二氧化钛(TiO_2)。用X射线衍射和透射电镜表征材料的结构与形貌。用该催化剂催化降解甲基橙,研究了催化剂用量、甲基橙的起始浓度、溶液pH值、光强度、溶液中添加金属离子的影响。结果表明:在较强紫外光照射下,当甲基橙的起始浓度为0.02g/L,TiO2用量为1.0g/L,光催化效率最高。酸性条件有利于光催化降解甲基橙。掺加Fe~(3+)或Zn~(2+)的光催化效率显著增加。掺加Mn2+或Ca2对光催化活性没有影响。在紫外光区域(366nm),样品对催化降解水溶液中甲基橙的活性较高。
Pure anatase titanium dioxide (TiO_2) with particle size of 25 ~ 35nm was prepared by direct boiling hydrolysis. The structure and morphology of the material were characterized by X-ray diffraction and transmission electron microscopy. The catalyst was used to catalyze the degradation of methyl orange. The effects of the amount of catalyst, the initial concentration of methyl orange, the pH value of the solution, the light intensity and the addition of metal ions in the solution were studied. The results showed that when the initial concentration of methyl orange was 0.02g / L and the dosage of TiO2 was 1.0g / L, the photocatalytic efficiency was the highest under the strong UV irradiation. Acidic conditions favor the photocatalytic degradation of methyl orange. The photocatalytic efficiency of Fe 3+ or Zn 2 + was significantly increased. Addition of Mn2 + or Ca2 has no effect on the photocatalytic activity. In the UV region (366nm), the sample has a high catalytic activity for the catalytic degradation of methyl orange in aqueous solution.