摘要
间接光降解是水体药物类污染物的主要去除途径之一,而有色溶解有机物(CDOM)是间接光降解的主要参与者.CDOM经过光照作用后产生大量活性中间体,与药物类污染物进行反应,完成间接光降解.本文着重研究了4种来源不同的CDOM对磺胺甲噁唑(SMZ)的间接光解作用和影响因素.结果表明,CDOM对于SMZ具有显著间接光降解作用,这种间接光降解具有双重性,既可以通过生成各种活性中间体来促进SMZ的间接光降解,又可以通过光屏蔽作用以及活性中间体掩蔽作用抑制SMZ的光降解.SMZ的间接光降解主要由CDOM产生的3CDOM*、HO·、1O2等活性中间体控制,其中3CDOM*为SMZ间接光降解的主要参与者.另外,pH、盐度和硝酸根离子对SMZ的间接光降解均具有显著影响作用,而碳酸氢根离子对于SMZ间接光降解的影响作用不明显.
Indirect photodegradation is one of the primary approaches for the removal of pharmaceutical contaminants from water.This degradation process is dominated by chromophoric dissolved organic matter(CDOM).After illumination,CDOM produces many reactive intermediates,which can react with drug pollutants to achieve indirect photodegradation.In this article,we focused on four different sources of CDOM and factors affecting indirect sulfamethoxazole(SMZ) photolysis.The results show that the indirect photodegradation effect of SMZ is significantly influenced by CDOM.This indirect photodegradation has a dual nature.It promotes the indirect photodegradation of SMZ through the formation of various reactive intermediates and at the same time inhibits the photodegradation of SMZ through light shielding and masking of reactive intermediates.The indirect photodegradation of SMZ is mainly controlled by active intermediates such as3 CDOM*,HO·,and 1O2 produced by CDOM;3 CDOM*is the main participant in indirect photodegradation of SMZ.In addition,the pH,salinity,and nitrate ions have a significant effect on the indirect photodegradation of SMZ,while bicarbonate ions have no significant effect on the indirect photodegradation of SMZ.
作者
李聪鹤
车潇炜
白莹
石晓勇
苏荣国
LI Cong-he;CHE Xiao-wei;BAI Ying;SHI Xiao-yong;SU Rong-guo(Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 261000,China;Key Laboratory of Sustainable Development of Marine Fisheries,Ministry of Agriculture,Yellow Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences,Qingdao 266071,China;National Marine Hazard Mitigation Service,Beijing 100194,China)
出处
《环境科学》
EI
CAS
CSCD
北大核心
2019年第1期273-280,共8页
Environmental Science
基金
国家重点研发计划项目(2016YFC1402101
2016YFC1400602)
