摘要：

以木质素的模型物愈创木酚(G-M)为研究对象，采用自制的纳米TiO₂作光催化剂，在一定的降解条件下对G-M光催化降解的动力学和机理进行了研究。实验表明G-M的光催化降解过程包括吸附和降解两部分，通过对G-M在TiO₂表面吸附性能的测定，得到其吸附平衡常数，在此基础上运用L-H方程对G-M光催化降解的动力学方程进行讨论，得到降解反应动力学方程1/r=1.744/C+0.1034。采用有机物特征功能团的显色法，对G-M光催化降解反应过程的中间产物进行了分析，推断在G-M降解反应过程中出现了开环、脱羧，最终完全分解矿化生成二氧化碳和水。

关键词: 废水处理, 愈创木酚, 光催化降解, 反应动力学

Abstract:

The photo-catalytic degradation mechanism of methyl catechol(G-M)has been investigated by using TiO₂as an activated photo-catalyst prepared in the lab.It is indicated from the results that the G-M photo-catalytic degradation includes two processes:adsorption and degradation.The adsorption equilibrium constant and the kinetic equation for photo-catalytic degradation are obtained by measuring of the capability of adsorption of G-M on the surface of TiO₂,which is 1/r=1.744/C+0.1034.Through the changes on the intermediates products with the organic character functional groups in the G-M degradation,it is found that the G-M appeared opening phenyl and taking off carboxyl,finally that is mineralized to CO₂and H₂O in the reaction of TiO₂.

Key words: wastewater treatment, methyl catechol, photo-catalytic degradation, reaction kinetics

中图分类号: 

• X703

• TQ134.1+1