Fe(Ⅱ)/亚硫酸盐体系活化溶解氧降解苯胺  

Degradation of Aniline by Dissolved Oxygen Catalyzed by Fe(Ⅱ)/Sulfite System

作　　者：蔺艺莹 宋宝东[1] Lin Yiying;Song Baodong(School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China)

机构地区：[1]天津大学化工学院,天津300350

出　　处：《化学工业与工程》2020年第4期1-6,共6页Chemical Industry and Engineering

基　　金：国家自然科学基金(51978455、51878449和21806121)。

摘　　要：研究了Fe(Ⅱ)/亚硫酸盐体系活化溶解氧氧化降解苯胺的工艺并探索了氧化过程中的主要活性物种。结果表明,溶解氧是苯胺氧化的氧化剂,pH=4.0以及亚硫酸盐与Fe(Ⅱ)物质的量之比为10∶1的体系对苯胺的催化效果最佳,苯胺去除率可达70%。Fe(Ⅱ)在体系中发挥着重要作用,只存在亚硫酸盐的情况下,苯胺去除效果下降至30%以下,且反应时间由90 min延长至40 h。在Fe(Ⅱ)/亚硫酸盐体系中,pH=3.0条件下Fe(Ⅱ)全部被氧化成Fe(Ⅲ),而在其它pH值条件下,Fe(Ⅱ)与Fe(Ⅲ)主要以络合物形式存在。叔丁醇与甲醇的自由基掩蔽实验进一步证实了SO·4-是氧化过程中的主要氧化物种,而SO·5-是次要氧化物种。实验结果丰富了Fe(Ⅱ)/亚硫酸盐体系催化溶解氧降解有机污染物的研究,表明其在有机工业废水处理方面具有很好的应用前景。Oxidation of aniline by dissolved oxygen(DO)catalyzed by the Fe(Ⅱ)/sulfite system was investigated in this study,and the oxidizing species involved in the oxidation process were also explored.The results showed that pH 4.0 and the molar ratio of sulfite to Fe(Ⅱ)of 10∶1 were the optimal experimental conditions for aniline degradation,and 70%aniline could be removed.Fe(Ⅱ)plays an important role in the catalytic oxidation of aniline,and the removal efficiency of aniline was less than 30%in the presence of sulfite alone,and the reaction time was also prolonged from 90 min to 40 h.In the Fe(Ⅱ)/sulfite system,all Fe(Ⅱ)would be oxidized to Fe(Ⅲ)at pH 3.0,while Fe(Ⅱ)and Fe(Ⅲ)mostly existed in the complexed forms except pH 3.0.Quenching experiments in the presence of tert-butyl alcohol and methanol further confirmed that the SO·-4 was the main oxidation species and SO·-5 was the secondary oxidation species.This finding enriches our understanding on the degradation of organic pollutants by DO and the Fe(Ⅱ)/sulfite system,indicating that it has a wide application prospect in the treatment of organic industrial wastewater.

关 键 词：亚硫酸盐 Fe(Ⅱ) 苯胺 SO·-4自由基 

分 类 号：TQ9[化学工程]