电辅助Fe^(2+)活化过硫酸盐法降解水中苯胺  

Degradation of Aniline Using E-Fe-PDS Process in Internal Circulation Batch Reactor

作　　者：杨春维[1,2] 桂雯雯 张书豪[1] 田馨[1] 戴亚衡 段小月[1,2] 

机构地区：[1]吉林师范大学吉林省高校环境材料与污染控制重点实验室 [2]吉林师范大学环境科学与工程学院,吉林四平136000

出　　处：《环境科学与技术》2017年第4期171-175,共5页Environmental Science & Technology

基　　金：吉林省科技厅自然科学基金项目(20140101215JC);吉林省科技厅重点科技攻关项目(20150204049SF);吉林省科技厅自然科学基金项目(20150520079JH);工业业生态与环境工程教育部重点实验室开放基金(KLIEEE-13-07)

摘　　要：采用内循环塔式反应器,对电解、电Fenton及电辅助Fe^(2+)活化过硫酸盐法(E-Fe-PDS)降解水中苯胺进行了对比实验研究。以石墨棒作为阳极,机械加工废料铁刨花作为阴极,阴极底部空气曝气,考察了电压、pH、Na_2S_2O_8浓度、FeSO_4浓度等反应参数对苯胺降解效果的影响。结果表明,E-Fe-PDS法降级苯胺效果最佳,反应30 min,苯胺去除率可达95.7%,苯胺的降解过程遵循准一级动力学规律。且通过中间产物分析发现,E-Fe-PDS法相对于电解和电Fenton法中间产物种类更少,矿化更为迅速,但同时会产生4,4'-二氨基联苯等聚合物质,因此该技术实际推广时应对底物及其中间产物进行详细评估并寻找合适条件以降低二次污染物产生风险。A comparative experimental study on aniline degradation in water was conducted involving three different technical processes i.e. electrolysis, electro-Fenton and E-Fe-PDS （electro-assisted Fe2＋ activated peroxydisulfate）. The experiment was conducted with a bench-scale internal circulation batch reactor （ICBR）, within which was fixed a graphite rod as anode and iron chips as cathode, as well as an aerator at the bottom. The operation parameters affecting aniline degradation were investigated, which included electric voltage, pH value, Na2S2O8 concentration and FeSO4 concentration. This experimental study suggested that of the three processed E-Fe-PDS was the best in aniline degradation with aniline removal rate of 95.7%, and its reaction process fitted with the pseudo-first order kinetics model. In addition, in the case of the reaction using E-Fe-PDS, the polymerization intermediates produced during the reaction process, detected by HPLC, were of fewer types but higher mineralization rate, in comparison with the electrolysis and electro-Fenton processes; however, some intermediate products such as 4, 4 ＇- diamino biphenyl, so called the secondary pollutants, were likely found as well, which were difficult to decompose. So, careful assessment is needed before the E-Fe-PDS technology is put into use in practice.

关 键 词：硫酸根自由基 Fe2+活化过硫酸盐法 内循环塔式反应器 苯胺 

分 类 号：X703.1[环境科学与工程—环境工程]