Titanium dioxide became the most common photocatalyst with its nonpoisonous, high catalytic activity, strong oxidation ability and good stability, but titanium dioxide could only be activated by UV, which decreased the efficiency of the photocatalyst in the visible light region.Doping was the most common modification methods to improve the catalytic properties of titanium dioxide. In this study, the sol-gel method prepared titanium dioxide of Mn-doped, by changing mol ratio of Ti and Mn or the ratio of ethanol and acetic acid. Different powder particle diameter for the adsorption of arsenic ions shows different catalytic properties. The UV-visible spectroscopy detect the light absorption of samples, the research showed that 2:1 ethanol and acetic acid and 1.5 % Mn-doped were the best catalytic performance.%TiO2以其无毒、催化活性高、氧化能力强、稳定性好成为最常用光催化剂,但是由于TiO2的禁带较宽(锐钛矿的Eg≈3.2 eV),光催化吸收仅限紫外光区,而太阳能中紫光的含量仅仅占3 %~5 %,其中掺杂是改善TiO2催化性能最常用的改性方法.本实验采用溶胶-凝胶法制备掺杂Mn的TiO2,通过改变Mn与Ti的摩尔比和无水乙醇和冰醋酸的比例这两种形式,制成颗粒径不同的粉末,用于吸附水中的砷离子,不同颗粒径的粉体紫外吸收性能不同.利用紫外-可见光光度计检测了所制备的样品的紫外光吸收性能,检测结果表明,2/1无水乙醇和冰醋酸的比例和掺杂摩尔比为2 %时,粉体紫外吸收能力较好.
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