摘要
为印证非均相催化臭氧化工艺的机理,对比不同反应体系硝基苯的降解.使用ESR、GC/MS和IC检测体系中HO.的引发和氧化产物.结果证实单独臭氧氧化和蜂窝陶瓷催化臭氧化对硝基苯的降解均遵循HO.氧化机理;与单独臭氧氧化相比,蜂窝陶瓷催化臭氧化产生较高质量浓度的HO.,引起TOC去除效果的明显升高;2个体系对硝基苯的降解都生成了中间产物.催化臭氧化去除水中硝基苯的中间产物主要含有硝基苯酚、硝基苯多酚和小分子有机酸,初步提出HO.氧化硝基苯的可能降解路径.
To Confirm the mechanism of heterogeneous catalytic ozonation, experiments were performed to compare the degradation of nitrobenzene in different systems. The initiation of HO^. and oxidation intermediates were determined by ESR, GC/MS and IC. The experimental results indicated that the degradation of nitrobenzene in aqueous solution followed the oxidation mechanism of HO^. in both the processes of ozonation alone and the ceramic honeycomb catalytic ozonation. Comparing with the ozonation system alone, the process of ceramic honeycomb catalytic ozonation could initiate higher concentration of HO^. , leading to the obvious increase in TOC removal. It was found that some intermediates were formed respectively during the decomposition of nitrobenzene in both the processes of ozonation alone and ceramic honeycomb catalytic ozonation. The results of GC/MS and IC analysis indicated that the major intermediates were nitrophenols, multi - hydroxy derivatives and low molecular weight organic acids. Phenol, hydroquinone, benzoquinone and nitrate ion were also detected as intermediates. A general reaction pathway for the degradation of nitrobenzene involving intermediates was proposed.
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2009年第4期62-66,共5页
Journal of Harbin Institute of Technology
基金
国家自然科学基金资助项目(50378028)
中国博士后科学基金资助项目(20080440130)
