Fenton氧化降解苯胺及机制研究

Research of aniline degradation and mechanism in Fenton process

以苯胺(C_6H_7N)废水为处理对象进行Fenton氧化降解试验,考察pH、H_2O_2投加量、n(H_2O_2)/n(Fe^(2+))比值以及苯胺初始浓度对Fenton降解苯胺的影响,并分析其降解途径.结果表明:苯胺初始浓度为50~200mg·L^(-1),pH=2~4,n(H_2O_2)/n(Fe^(2+))=10,n(H_2O_2)/n(C_6H_7N)=10~15,反应60min苯胺去除率达75.4%~87.4%;若苯胺浓度大于600mg·L^(-1),所需反应时间延长且降解率降低.检测发现苯胺降解需经过羟基化、取代、脱氢、开环产酸阶段,其中丁烯二酸为苯胺降解过程中产酸阶段重要的中间产物,且可生化性高,易降解.因此,认为在Fenton预处理苯胺过程中,可将苯胺降解到控制丁烯二酸阶段,以丁烯二酸作为后续生化处理目标污染物的处理方法有利于苯胺的完全矿化.

Based on the C6 H7 N wastewater, a series of experiments referring to the Fenton oxidative degradation were conducted, and all of the following were investigated, including the dosage of pH, H2 02, the ration of n （He 02 ）/n （Fe2＋）, and the initial concentration of aniline, in addition, the degradation pathways of aniline were also analyzed. It turned out that when the concentration of aniline was between 50 mg·L-1 and 200 mg·L-1 , the pH ranged from 2 to 4, and the n（H202）/ n（C6H7N） was between 10 and 15, the aniline removal was from 75. 38% to 87. 38% after the reaction about 60 minutes; when the concentration of aniline exceeded 600 mg·L-1, the reaction time could be extended and the removal rate was decreased. After the investigating, the degradation of aniline included four stages, the hydroxylation, substitution, dehydrogenation and ring opening. Regarding that the butenedioic acid played a crucial role in the aniline degradation process and was with high biodegradability, the new idea that the butenedioic acid was not only the expected production, but also was target pollutants as in the subsequent targets of bio-treatment was advised, which was beneficial to aniline mineralization.