摘要
该文系统性地研究了石墨相氮化碳负载铁钴双金属硫化物(FeCo_(2)S_(4)-CN)活化过氧乙酸(PAA)降解磺胺甲恶唑(SMX)的性能和机制。结果表明,FeCo_(2)S_(4)-CN/PAA体系可以实现SMX的高效降解,最高可达99.7%,且FeCo_(2)S_(4)-CN具有良好的可重复利用性与稳定性;体系中产生的活性物种主要为HO·、CH_(3)C(O)O·和CH_(3)C(O)OO·,其中CH_(3)C(O)O·和CH_(3)C(O)OO·在SMX去除中占主导作用,HO·起次要作用。初始pH为6.5时该体系对SMX的降解效果最佳,增加PAA和FeCo_(2)S_(4)-CN的投加量均有利于SMX的降解。水体基质影响实验显示,SO_(4)^(2-)、NO_(3)^(-)、Ca^(2+)和Mg^(2+)对SMX降解几乎无影响,而高浓度的Cl~-表现出轻微抑制,HCO_(3)^(-)和富里酸则展现出显著的抑制作用。基于检出的5种SMX降解产物,提出了其在体系中可能的降解路径,包括氨基氧化、羟基化、断键和偶联反应等。
In this study,the degradation performance and mechanism of sulfamethoxazole(SMX)by graphitic carbon nitride supported iron-cobalt bimetallic sulfide(FeCo_(2)S_(4)^(-)CN)activated peracetic acid(PAA)were systematically investigated.The results showed that FeCo_(2)S_(4)^(-)CN/PAA system can efficiently degrade SMX,and the highest degradation efficiency reached 99.7%.FeCo_(2)S_(4)^(-)CN had good reusability and stability in the activation of PAA.HO·,CH_(3)C(O)O·and CH_(3)C(O)OO·were the main reactive species in this system.Among them,CH_(3)C(O)O·and CH_(3)C(O)OO·played major roles in SMX removal,while HO·played a minor role.This system had the highest efficiency on SMX degradation when the initial pH was 6.5.The in⁃crease of PAA and FeCo_(2)S_(4)^(-)CN dosage was beneficial to SMX removal.SO_(4)^(2-),NO_(3)^(-),Ca^(2+) and Mg^(2+) had little effect on SMX removal,while high concentration of Cl-showed slight inhibition on SMX degradation,HCO_(3)^(-) and fulvic acid presented a significant inhibition on SMX elimination in this system.Based on the five detected SMX degradation products,the possible SMX degradation pathways in this system were proposed,including amino oxidation,hydroxylation,bond breaking and coupling reactions.
作者
胡虹
陈传曾
许铃涵
周润宇
刘义青
HU Hong;CHEN Chuanzeng;XU Linghan;ZHOU Runyu;LIU Yiqing(School of Environmental Science and Engineering,Southwest Jiaotong University,Chengdu 611756,China;Zhejiang Provincial Research Academy of Development Planning,Hangzhou 310000,China)
出处
《环境科学与技术》
北大核心
2026年第1期54-60,共7页
Environmental Science & Technology
基金
国家重点研发计划青年科学家项目(2023YFB2390100)
西南交通大学新型交叉学科培育基金项目(2682024QZ007)。
关键词
铁钴双金属
过氧乙酸
磺胺甲恶唑
高级氧化
iron-cobalt bimetallic
peracetic acid
sulfamethoxazole
advanced oxidation
