改性TiO2对X-3B的光催化性能及其降解动力学研究

以活性艳红X-3B为模型化合物,比较了改性前后TiO2光催化活性的变化.试验结果表明,通过改性大大提高了TiO2的光催化活性,Fe3+和Ag+的掺杂量均有一个最佳值,在试验的掺杂范围内Fe3+和Ag+的最佳掺杂量分别是0.1%和0.05%.对其宏观降解反应动力学的研究表明,X-3B在TiO2、Fe3++TiO2和Ag++TiO2 3种催化剂上的光催化降解动力学均能很好地符合Langmiur-Hinshelwood动力学模型.其表观反应速率常数的大小顺序依次是Ag++TiO2＞Fe3++TiO2＞TiO2;吸附平衡常数则是Fe3++TiO2和Ag++TiO2两者基本相等,两者均比纯TiO2大2～3倍.

Study on the photocatalysis performance and degradation kinetics of X-3B over modified titanium dioxide

Reactive brilliant X-3B was used as model compound to study the photocatalytic reactivity of TiO-2. Experiment results showed that Fe+{3+} and Ag++ were doped on TiO-2 could greatly improve the reactivity of TiO-2, and the doping amount of Fe+{3+} and Ag++ have optimum values, which is 0.1% and 0.05% respectively at the adulteration range of experiments. The photocatalytic degradation kinetics of X-3B on TiO-2, Fe+{3+}+TiO-2 and Ag+++TiO-2 were also studied. Experiment results showed that the degradation of X-3B on all of them were in accordance with Langmiur-Hinshelwood kinetics model well, the sequence of apparent reaction rate constants k of TiO-2, Fe+{3+}+TiO-2 and Ag+++TiO-2 was Ag+++TiO-2>Fe+{3+}+TiO-2>TiO-2, while adsorption equilibrium constants %K%-A of Fe+{3+}+TiO-2 and Ag+++TiO-2 was close and they were both greater than that of TiO-2.;