微囊藻毒素-LR的臭氧降解研究 Degradation of Microcystin-LR by Ozonation Process

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微囊藻毒素-LR的臭氧降解研究

Degradation of Microcystin-LR by Ozonation Process

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摘要:采用不同的臭氧投加量,考察了微囊藻毒素-LR(MC-LR)的降解效果,并通过对臭氧氧化过程中产生的8种主要降解产物的相对分子质量分析,推测其降解途径.结果表明,臭氧氧化降解MC-LR主要通过Adda途径和Mdha途径来完成对MC-LR的降解和脱毒作用.臭氧氧化的Adda途径是通过对MC-LR上Adda侧链的进攻,断开具有活性的Adda支链,而达到脱毒的目的;臭氧氧化的Mdha途径是通过对MCs肽环上面Mdha和Ala的断键,打开环状肽链,使藻毒素失去活性,在整个过程中Adda途径占主导地位.在O_3:MC为6时,MC-LR的去除率最高可达到92%.
Abstract:Degradation and byproducts of microcystin-LR (MC-LR) under different ozone dosages were investigated, and,the pathway and mechanism for the degradation of MC-LR were also elucidated according to the molecular weight of 8 degradation byproducts during ozonation process in this paper. The results showed that there were two pathways for the degradation of MC-LR by ozone. The first one is that the diene structure in Adda side chain was attacked and cleaved, which was named as Adda degradation pathway. The second one is that the pathway of Mdha and Ala degradation, which was that the peptide bond between Mdha and Ala was attacked and cleaved. Adda degradation pathway was dominant and mainly responsible for the degradation of MC-LR by ozone. The removal of MC-LR by ozone could reach 92% when O_3 : MC is 6.
作 者: 缪恒锋    陆新    严群    谢利娟    阮文权    MIAO Heng-feng    LU Xin    YAN Qun    XIE Li-juan    RUAN Wen-quan  
作者单位:江南大学环境与土木工程学院,无锡,214122 
期 刊:环境科学   ISTICPKU  
Journal:CHINESE JOURNAL OF ENVIRONMENTAL SCIENCE  
年,卷(期):2009, 30(11) 
分类号:X703.1 
关键词: 微囊藻毒素-LR    臭氧氧化    降解途径   
Keywords: MC-LR    ozonation    degradation pathway   
机标关键词:微囊藻毒素臭氧氧化MC-LR降解途径氧化降解molecular weightpeptide bond臭氧投加量side chainstructuredifferentAla主导地位质量分析氧化过程相对分子脱毒降解效果降解产物去活性 
基金项目:高等学校科技创新工程重大项目培育基金 
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