过硫酸盐阴极型微生物脱盐燃料电池降解茜素黄R  

Degradation of alizarin yellow R using persulfate- cathode microbial desalination fuel cell

作　　者：杨慧婷 鲁仙 闵俊杰 向涛 屈惠 邢云青[1] 张饮江[1] YANG Huiting;LU Xian;MIN Junjie;XIANG Tao;QU Hui;XING Yunqing;ZHANG Yinjiang(College of Oceanography and Ecological Science,Shanghai Ocean University,Shanghai,201306,China;State Key Laboratory of Pollution Control and Resource Reuse,College of Environmental Science and Engineering,Tongji University,Shanghai,200092,China)

机构地区：[1]上海海洋大学海洋科学与生态环境学院,上海201306 [2]同济大学环境科学与工程学院,污染控制与资源化研究国家重点实验室,上海200092

出　　处：《环境化学》2024年第11期3886-3899,共14页Environmental Chemistry

基　　金：国家自然科学基金青年基金(52000128);上海高校青年教师培养资助计划(ZZHY21035);上海市青年科技英才扬帆计划(2019YF1990)资助.

摘　　要：茜素黄R(AYR)是一种广泛使用的阴离子偶氮类染料,长期存在于水环境中的AYR对生态系统和人类健康存在潜在威胁.本研究在构建了一种过硫酸盐阴极型微生物脱盐燃料电池(MDCs)的基础上,系统研究了过硫酸盐阴极型MDCs降解AYR的动力学及机理.分别探究了阴极初始pH值、过硫酸盐(PDS)投加量、共存阴离子和有机物等环境因素对AYR降解动力学的影响,同时分析了AYR的降解产物与降解机理.结果表明,与单独MDCs和单独PDS相比,过硫酸盐阴极型MDCs能够快速高效地降解AYR,AYR的降解过程符合拟一级反应动力学模型.在pH=3和PDS投加量为1 mmol·L^(−1)时,AYR的降解速率常数(Kobs)最高;共存的阴离子对AYR的降解存在不同程度的促进或抑制效果;有机物腐殖酸及牛血清蛋白均抑制AYR的氧化降解.反应120 min后,阴极反应液的TOC得到部分去除,AYR的主要降解机理包括偶氮键断裂、脱羧、苯环断裂及脱氮等多步反应.Alizarin yellow R(AYR)is a commonly used anionic azo dye.The long-term presence of AYR in the aquatic environment poses a potential threat to ecosystems and human health.In this paper,on the basis of constructing a persulfate-cathode microbial desalination fuel cell(MDCs),the kinetics and mechanism of AYR degradation by persulfate-cathode MDCs were systematically investigated.The effects of environmental factors such as initial cathode pH,PDS dosage,coexisting anions,and organic matter on the kinetics of AYR degradation were investigated.Meanwhile the degradation products and mechanism of AYR were studied.The results demonstrated that persulfate-cathode MDCs can degrade AYR quickly and effectively compared with MDCs alone and PDS alone.The AYR degradation process followed pseudo first order reaction kinetics model.The degradation rate(Kobs)of AYR was highest with the pH=3 and 1 mmol·L^(-1) PDS dosage respectively.The coexisting anions had varying degrees of promoting or inhibiting effects on the degradation of AYR.Both organic humic acid and bovine serum protein inhibited the oxidative degradation of AYR.After 120 minutes of reaction,TOC was partially removed in the cathodic reaction solution,and multi-step reactions like azo bond breaking,decarboxylation,benzene ring breaking,and denitrification were the key mechanisms of AYR degradation.

关 键 词：茜素黄R 过硫酸盐 微生物脱盐燃料电池 动力学 降解机理 

分 类 号：X-1[环境科学与工程] O6[理学—化学]