摘要
以LED-UV365/PDS为研究体系,考察了对碘帕醇(IPM)的降解效能。实验结果表明,单独PDS、单独UV365辐照基本无法降解IPM,LED-UV365/PDS体系可显著促进IPM的降解,且反应过程符合假一级反应,这主要得益于反应体系产生的活性物种(HO·、SO_(4)^(·-)、O_(2)^(·-)和^(1)O_(2)),其中HO·的贡献最大。研究了PDS浓度、pH、天然有机物(NOM)和阴离子(HCO_(3)^(-)、Cl^(-))浓度对IPM降解效果的影响,结果表明IPM的降解率随PDS浓度的增加逐步升高。在酸性、碱性、中性条件下,LED-UV_(365)/PDS体系均可高效降解IPM。NOM因具有内滤波效应以及对活性物种的捕获作用,可明显抑制IPM的降解效果;通过实验与计算获得NOM在365 nm处的吸光系数为26.52 L/(g·cm);阴离子存在会轻微抑制IPM的降解。测定出14种有机产物,推测IPM主要通过脱碘反应、夺氢反应、取代反应、氨氧化和酰胺水解等方式逐步被降解。利用明亮发光杆菌评估了急性毒性变化,发现IPM及其有机产物基本无急性毒性。
The degradation efficiency of iopamidol(IPM)was investigated by using LED-UV365/PDS as the study sys⁃tem.The experimental results showed that PDS alone and UV365 irradiation alone were basically unable to degrade IPM,and LED-UV365/PDS system could significantly promote the degradation of IPM,and the reaction process was consistent with a pseudo-first order reaction.It was mainly due to the active species(HO·、SO_(4)^(·-)、O_(2)^(·-)and^(1)O_(2))pro⁃duced by the system,with the largest contribution from HO·.The effects of PDS concentration,pH,natural organic matter(NOM)and anion(HCO_(3)^(-)、Cl^(-))concentrations on the degradation of IPM were investigated,and the results showed that the degradation rate of IPM gradually increased with the increase of PDS concentration.Under acidic,alkaline and neutral conditions,the LED-UV365/PDS system could degrade IPM efficiently,and NOM could signifi⁃cantly inhibit the degradation of IPM due to its internal filtering effect and capture on active species.The absorption coefficient of NOM at 365 nm was obtained by experiment and calculation as 26.52 L/(g·cm).The presence of an⁃ions slightly inhibited the degradation of IPM.Fourteen organic products were determined,and it was hypothesized that IPM was gradually degraded mainly through deiodination reaction,extraction reaction,substitution reaction,amine oxidation and amide hydrolysis.Acute toxicity changes were assessed using Luminescent bacterium,and it was found that IPM and its organic products were essentially free of acute toxicity.
作者
李明安
王榕
罗从伟
宋阳
武道吉
谭凤训
成小翔
LI Ming’an;WANG Rong;LUO Congwei;SONG Yang;WU Daoji;TAN Fengxun;CHENG Xiaoxiang(School of Municipal and Environmental Engineering,Shandong Jianzhu University,Ji’nan 250101,China;Soil Pollution Control Center of Shandong Province,Ji’nan 250012,China;Institute of Resources and Envi-ronment Innovation,Shandong Jianzhu University,Ji’nan 250101,China;School of Civil and Transportation Engineering,Guangdong University of Technology,Guangzhou 510006,China)
出处
《工业水处理》
CAS
CSCD
北大核心
2023年第4期63-70,共8页
Industrial Water Treatment
基金
国家自然科学基金(51908335,51908143)
中国博士后科学基金项目(2020M672085)
山东省博士后创新项目(202002023)。
关键词
高级氧化
碘帕醇
造影剂
急性毒性
advanced oxidation
iopamidol
contrast agent
acute toxicity
作者简介
李明安(1997—),硕士。E-mail:lma970111@163.com;通讯作者:罗从伟,研究员。E-mail:luocongwei2009@163.com。
