掺杂铁离子和铜离子的TiO_2光催化剂的研究

Research on titanium dioxide photocatalyst doped by Fe^(3+) and Cu^(2+)

利用钛酸正四丁酯水解制备了几种不同浓度的TiO_2胶体,在降解甲基橙后发现,R(乙醇与水物质的量比)值为1/50的0.01 mol/L TiO_2胶体降解效果最好。在不同的pH值、反应温度、搅拌速度下制备了同时掺杂铁离子和铜离子的R值为1/50的0.01 mol/L TiO_2胶体,通过光降解甲基橙,发现pH值、反应温度、搅拌速度和掺杂离子浓度对TiO_2胶体的形态、掺杂效果和光催化活性均有影响。对比纯TiO_2胶体的光降解甲基橙效果发现,掺杂铁离子和铜离子的TiO_2光催化剂在pH值2.0、低搅拌速度、室温情况下,具有更好的光催化活性。

Different contents of TiO_2 colloids are prepared by hydrolysis of tetrabutyl titanate.After testing the samples' photocatalytic on methyl orange,the results indicated that the catalysts have better photocatalytic activity at conditions of R (the molar ratio of ethyl alcohol absolute and water)=1/50 and the content of TiO_2 is 0.01 mol/L.The TiO_2 colloids doped by the different concentration of Fe^(3+)and Cu^(2+)are prepared at these conditions,different pH value,different temperature and different churning speed.After testing the samples' photocatalytic activity on methyl orange,it is found that these factors and the concentration of doping ions have all the effects on the form of TiO_2 colloids,effects of doping ions and photocatalytic activ- ity.Contrasted with the photocatalytic activity of the pure TiO_2 colloid,the photocatalysts doped Fe^(3+)and Cu^(2+)have better photocatalytic activity at condition of slowly churning speed,room temperature,pH=2.0.