摘要
以活性艳红 X-3 B为模型化合物 ,比较了改性前后 Ti O2 光催化活性的变化。试验结果表明 ,通过改性大大提高了 Ti O2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 F e3+和 Ag+的最佳掺杂量分别是 0 .1%和 0 .0 5 %。对其宏观降解反应动力学的研究表明 ,X-3 B在 Ti O2 、Fe3+ +Ti O2 和 Ag+ +Ti O2 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+ +Ti O2 >Fe3+ +Ti O2 >Ti O2 ;吸附平衡常数则是 Fe3+ +Ti O2 和 Ag+ +Ti O2 两者基本相等 ,两者均比纯 Ti O2 大 2～ 3倍。
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.;
出处
《环境污染与防治》
CAS
CSCD
北大核心
2004年第2期84-86,100,共4页
Environmental Pollution & Control
基金
国家自然科学基金资助项目 ( No.2 0 2 0 70 0 2 )
关键词
TIO2
改性技术
光催化性能
降解动力学
活性艳红X-3B
Modified TiO-2 Reactive brilliant X-3B Photocatalytic degradation Kinetics Langmiur-Hinshelwood model
