CWPO处理含酚废水催化材料与反应机理研究进展

Research progress on catalytic materials andreaction mechanism for CWPO treatment of phenolic wastewater

酚类污染物是常见的有机污染物之一,含酚废水处理难度大、毒性强,对自然环境与人类健康具有严重危害。催化湿式过氧化氢氧化技术(CWPO)以H_(2)O_(2)为氧化剂,利用催化剂催化产生·OH强氧化性自由基,可去除水中难降解有机污染物。介绍了CWPO非负载与负载型催化剂在含酚废水中的应用情况,负载型催化剂更具应用前景。利用密度泛函理论(DFT)分析了苯酚、间甲酚污染物主要降解途径,降解含酚废水是通过体系中·OH逐步改变苯环稳定结构形成苯醌类中间体,该中间体C-C断裂开环形成短链羧酸,最终完全矿化为CO_(2)和H_(2)O。未来可从制备稳定环保催化剂、分析实际废水降解机制方面展开研究,以发挥CWPO在含酚废水中的应用潜力。

Phenolic pollutants are one of the common organic pollutants.Phenolic wastewater treatment is difficult and highly toxic,which has serious harm to the natural environment and human health.Catalytic wet hydrogen peroxide oxidation technology(CWPO)uses H_(2)O_(2) as oxidant and catalyst to generate·OH strong oxidizing free radicals,which can remove refractory organic pollutants in water.This paper introduces the application of CWPO non-supported and supported catalysts in phenol wastewater.Density Functional Theory(DFT)was used to analyze the main degradation pathways of phenol and m-cresol pollutants.The degradation of phenol wastewater is through·OH in the system to gradually change the stable structure of benzene ring to form benzoquinone intermediates,and the C—C intermediates break open to form short-chain carboxylic acids,and finally completely mineralize into CO_(2)and H_(2)O.In the future,studies can be carried out on the preparation of stable environmental protection catalyst and analysis of actual wastewater degradation mechanism,so as to exert the application potential of CWPO in phenolic wastewater.