热活化过硫酸盐降解四环素及其中间产物毒性研究  

Degradation of Tetracyclines and Toxicity of Intermediate Products in a Thermal-activated Persulfate System

作　　者：丁文川[1,2] 杨梅 曾晓岚[1,2] 徐晓棠[1,2] 陈昶文 曾衍铨 DING Wen-chuan;YANG Mei;ZENG Xiao-lan;XU Xiao-tang;CHEN Chang-wen;ZENG Yan-quan(Key Laboratory of the Three Gorges Reservoir Region’s EcoEnvironment,Chongqing University,Chongqing 400045,China;Low Carbon Green Building International Joint Research Center,Chongqing University,Chongqing 400045,China;Guangdong Guangya High School,Guangzhou 510000,China)

机构地区：[1]重庆大学三峡库区生态环境教育部重点实验室,重庆400045 [2]重庆大学低碳绿色建筑国际联合研究中心,重庆400045 [3]广东广雅中学,广东广州510000

出　　处：《中国给水排水》2021年第21期56-63,共8页China Water & Wastewater

基　　金：重庆市技术创新与应用发展项目(CSTC2019jscx-msxmX0158);重庆大学大型仪器设备开放基金资助项目(202103150106)。

摘　　要：以四环素(TC)为目标污染物,研究了热活化过硫酸盐(PS)体系对TC的降解动力学、降解机理及中间产物的生物毒性。结果表明,TC的降解过程符合准一级反应动力学,TC降解主要集中在反应前20 min;提高体系温度或PS/TC(物质的量浓度比)都可以显著提高TC的降解速率;酸性条件下TC的降解效果最好。TC的降解途径主要包括:脱甲基、脱氨基、脱羟基、开环、加氧和水解。在反应前40~60 min的TC降解中间产物显示出较原TC更高的脱氢酶活性抑制率,其后反应时间越长,TC的矿化程度越高,产物的脱氢酶活性抑制率越低。A thermal-activated persulfate system was applied to degrade tetracyclines(TC),and the degradation kinetics,degradation mechanism and biotoxicity of the intermediate products were investigated.The degradation process of the TC was in accordance with quasi first-order kinetics,and the TC degradation mainly occurred in the former 20 min of the reaction.Increasing the temperature of the system or the molar concentration ratio of PS to TC could significantly improve the degradation rate of the TC.The degradation performance of the TC was the best under acidic condition.The speculative degradation pathways of the TC mainly included demethylation,deamination,dehydroxylation,ring opening,oxygenation and hydrolysis.In the former 40-60 min,the dehydrogenase activity inhibition rate of the intermediate products was higher than that of the original TC.Then,longer reaction time would result in a higher degree of the TC mineralization and a lower dehydrogenase activity inhibition rate of the products.

关 键 词：四环素 过硫酸盐 热活化 降解途径 中间产物 生物毒性 

分 类 号：TU992[建筑科学—市政工程]