摘要
本文研究了水中典型无机阴离子SO_(4)^(2-)、NO_(3)^(-)、Cl-、HCO_(3)^(-)、CO_(3)^(2-)对层状Mo_(2)C活化过氧单硫酸盐(PMS)氧化降解氯霉素类抗生素的影响.结果表明,5种无机阴离子对3种氯霉素类抗生素(氯霉素、甲砜霉素、氟苯尼考)的降解反应均具有抑制作用.其中SO_(4)^(2-)和NO_(3)^(-)主要影响抗生素的反应速率,Cl-、HCO_(3)^(-)、CO_(3)^(2-)既影响其降解率又影响其反应速率.在Cl-、HCO_(3)^(-)和CO_(3)^(2-)浓度分别为20mmol/L时,氯霉素的降解率从100%分别降为59.27%、2.85%、无降解;甲砜霉素的降解率从100%分别降为64.64%、8.54%、无降解;氟苯尼考的降解率从100%分别降为33.23%、1.38%、无降解.其中,CO_(3)^(2-)对抗生素降解具有强抑制作用,在5mmol/L时就可完全抑制3种氯霉素类抗生素降解.5种阴离子对3种氯霉素类抗生素的降解影响具有同样的趋势,表现为CO_(3)^(2-)>HCO_(3)^(-)>Cl->NO_(3)^(-)≈SO_(4)^(2-).此外,3种抗生素的降解率与Cl^(-)浓度之间存在显著负相关关系,而甲砜霉素和氟苯尼考的降解率与HCO_(3)^(-)浓度之间也存在显著负相关关系.
The effects of typical inorganic anions SO_(4)^(2-),NO_(3)^(-),Cl^(-),HCO_(3)^(-),CO32-on oxidative degradation of chloramphenicol antibiotics by layered Mo_(2)C activated peroxonosulfate(PMS)were investigated.The results showed that the degradation of three chloramphenicol antibiotics(chloramphenicol,thiamphenicol and flufenicol)was inhibited by the five inorganic anions,in which SO_(4)^(2-)and NO_(3)^(-)mainly affected the reaction rate.Cl^(-),HCO_(3)^(-)and CO_(3)^(2-)affected both the degradation percentage and the reaction rate.When the concentrations of Cl^(-),HCO_(3)^(-)and CO_(3)^(2-) were 20mmol/L,the degradation percentage of chloramphenicol was decreased from 100%to 59.27%,2.85%and 0%,respectively.The degradation percentage of thiamphenicol was decreased from 100%to 64.64%,8.54%and 0%,respectively.And the degradation percentage of flufenicol was decreased from 100%to 33.23%,1.38%,and 0%,respectively.Among them,CO_(3)^(2-)had a strong inhibitory effect on antibiotics degradation,and the degradation of three chloramphenicol antibiotics was completely inhibited at the presence of 5mmol/L CO_(3)^(2-).The effects of five inorganic anions on the degradation of three chloramphenicol antibiotics showed the trend,as CO32->HCO_(3)^(-)>Cl^(-)>NO_(3)^(-)≈SO_(4)^(2-).In addition,there was a significant negative correlation between the degradation of the three antibiotics and Cl^(-),while there was also a significant negative correlation between the degradation of thiamphenicol,flufenicol and HCO_(3)^(-).The results provided a reference for the practical application of advanced oxidation processes.
作者
周舟
汤磊
赵旭强
陈旭文
王贺飞
高彦征
ZHOU Zhou;TANG Lei;ZHAO Xu-qiang;CHEN Xu-wen;WANG He-fei;GAO Yan-zheng(Institute of Organic Contaminant Control and Soil Remediation,Nanjing Agricultural University,Nanjing 210095,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2024年第3期1648-1656,共9页
China Environmental Science
基金
国家自然科学基金(41925029)
中国博士后科学基金面上资助项目(2023M731723)
江苏省卓越博士后计划项目(2023ZB478)。
