TNT和有机染料废水的光催化氧化动力学特性

利用光催化氧化技术能有效处理各类有机废水，具有高效、低选择性和不产生二次污染的特点，探讨了循环式浆态光催化反应器中有机染料和TNT模拟生产废水的光催化氧化特性以及光催化氧化动力学。基于羟基自由基生成、扩散以及羟基自由基与污染物分子的反应，建立了相应的光催化氧化动力学模型。结果表明，采用光催化氧化技术去除有机染料和TNT效果明显。光照时间为6h时，在一定的初始TNT浓度下，模拟红水中TNT去除率达90％以上。对不同染料和TNT不同初始浓度下的光催化氧化反应动力学研究表明，此过程符合拟一级动力学。所提出的光催化氧化动力学模型能够很好地描述有机染料和TNT的光催化氧化过程。

Photocatalytic Oxidation Kinetics of Waste Water with TNT and Organic Dyes

The performance and kinetics of decomposition of TNT and organic dyes in industrial waste water in circulating slurry photocatalytic reactors by employing the photocatalytic oxidation is investigated. Based on the formation and diffusion of hydroxyl radicals, and their reaction with organic dyes or TNT molecules, the kinetics model for photocatalytie oxidation of TNT and organic dye is established. The results show that organic dyes and TNT can be effectively decomposed by the photocatalytic oxidation. Removal percentage of TNT with different initial concentrations can reach above 90% at 6 hours. The results for kinetics of the photocatalytic oxidation of TNT with different initial concentrations and different organic dyes show that the photocatalytic degradation rate follows pseudo-first order kinetic model. The photocatalytic oxidation of TNT and organic dyes can also be described by the kinetics model proposed.