羟胺强化Fe(Ⅲ)-NTA/H_(2)O_(2)类芬顿体系降解磺胺甲恶唑  

Hydroxylamine Improved Fe(Ⅲ)-NTA/H_(2)O_(2) Fenton-like System for the Degradation of Sulfamethoxazole

作　　者：潘承欢 刘义青 彭藴斓 付永胜 PAN Chenghuan;LIU Yiqing;PENG Yunlan;FU Yongsheng(Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]西南交通大学地球科学与环境工程学院,四川成都611756

出　　处：《水处理技术》2024年第7期29-34,共6页Technology of Water Treatment

基　　金：四川省科技厅应用基础研究项目(2021YJ0385)。

摘　　要：为改善传统芬顿法pH应用范围窄、铁泥产量大等缺陷,提出了一种新型Fe(Ⅲ)-NTA/HAm/H_(2)O_(2)类芬顿体系用于降解水中新污染物磺胺甲恶唑(SMX)。考察了不同pH、Fe(Ⅲ)浓度对该体系降解SMX的影响,探究了SMX在该体系中的降解机理,并评估了该体系对其他有机污染物的降解效能。实验结果表明,Fe(Ⅲ)-NTA/HAm/H_(2)O_(2)体系在中性或弱碱条件下对SMX的降解率可达85%以上,并且SMX的去除率随着Fe(Ⅲ)投加量的增加而增大。通过自由基淬灭实验,识别出HO•为体系中降解SMX的主要活性物种,并根据SMX的降解产物提出了SMX可能的三条降解途径:羟基化、氨基氧化和断键反应。相较于传统芬顿法,Fe(Ⅲ)-NTA/HAm/H_(2)O_(2)体系的pH应用范围显著拓宽,铁泥产量明显减少,并且该体系也能有效降解罗丹明B、橙黄G、双氯芬酸、土霉素等其他有机污染物,说明该体系具有一定的应用潜力。In order to optimize the traditional Fenton process including narrow pH application range and large iron sludge production,a novel Fentonlike system,i.e.,Fe(Ⅲ)-NTA/HAm/H_(2)O_(2),was proposed to degrade sulfamethoxazole(SMX)as an emerging contaminant in this study.The effect of solution pH and Fe(Ⅲ)concentration on the SMX degradation in the Fe(Ⅲ)-NTA/HAm/H_(2)O_(2)system was investigated,and the degradation mechanism of SMX in this system was explored.Additionally,the degradation efficiency of other organic pollutants by this system was studied.The experimental results showed that the degradation rate of SMX could reach 85%in the Fe(Ⅲ)-NTA/HAm/H_(2)O_(2)system under neutral or weakly alkaline conditions,and the removal rate of SMX increased with increasing Fe(Ⅲ)concentration.According to the radical quenching experiments,HO•was proved to be the dominant species for the SMX degradation in this system.Three possible degradation pathways of SMX were proposed through the detected degradation products,including hydroxylation,amino oxidation and bond cleavage.In comparison of the traditional Fenton reaction,the pH application range of the Fe(Ⅲ)-NTA/HAm/H_(2)O_(2)system was significantly broadened and the iron sludge production was reduced.In addition,other organic pollutants(i.e.,rhodamine B,orange G,diclofenac and oxytetracycline)were also effectively removed in the Fe(Ⅲ)-NTA/HAm/H_(2)O_(2)system,suggesting that this system exhibits a huge potential in the treatment of organic pollutants.

关 键 词：磺胺甲恶唑 羟胺 Fe(Ⅲ)-NTA络合物 过氧化氢 类芬顿反应 

分 类 号：X703.1[环境科学与工程—环境工程]