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
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
CLC Number:
Wang Chang, Chen Wendong, Li Zhaoguang, Li Guiju, Jia Qingzhu. The degradation mechanism of nano-TiO2photo-catalytic oxidation of methyl catechol[J]. INDUSTRIAL WATER TREATMENT, 2007, 27(12): 18-21.
王昶, 陈文东, 李兆光, 李桂菊, 贾青竹. 纳米TiO2光催化氧化愈创木酚的降解机理[J]. 工业水处理, 2007, 27(12): 18-21.