Cu^(2+)对富里酸(FA)形态结构与其三卤甲烷生成能力的影响  

Effect of Cu^(2+) on the structure of fulvic acid( FA) and its subsequent trihalomethane formation potential

作　　者：刘立超 李静 李征[2] 吉庆华[3] 

机构地区：[1]河北工业大学土木与交通学院,天津300401 [2]中国市政工程华北设计研究总院第一设计研究院,天津300074 [3]中国科学院生态环境研究中心,北京100085

出　　处：《环境化学》2018年第2期249-254,共6页Environmental Chemistry

基　　金：河北省高等学校科学技术研究项目(QN2014081)资助~~

摘　　要：水体中存在的金属离子会干扰活性氯与有机物的反应,进而影响其消毒副产物的生成情况.本文采用紫外可见光谱、红外光谱以及超滤膜分级(UF)等表征方法,研究Cu^(2+)在氯化过程中对富里酸(FA)的形态结构和其消毒副产物——三卤甲烷生成能力(THMs FP)的影响.结果显示,氯化过程中,Cu^(2+)对各个分子量范围FA的THMs FP均有促进作用,其中分子量范围在10—30 k Da的FA受Cu^(2+)影响最大.这主要是由于Cu^(2+)可与FA中酚、醇等含氧官能团发生络合作用,同时也通过该结构加速FA的水解,催化HOCl和HOBr与FA发生氧化和取代反应,从而促进THMs(尤其是溴代产物)的生成.Formation of disinfection by-products（DBPs）and the reactions between hypochlorite and organic matter are affected by the metal ions in the chlorination process.The major objective of the present study was to investigate the role of Cu2＋on the species transformation and structure variation of fulvic acid（FA）and trihalomethanes formation potential（THMs FP）when FA was chlorinated.The THMs FP were measured at different Cu（Ⅱ）concentrations.The transformation of organics during chlorination was characterized by UV-visible absorption spectroscopy（UV-Vis）,Fourier transformed infrared spectroscopy（FTIR）and ultra-filtration（UF）.Cu（Ⅱ）showed different promotion effects on THMs FP of the organics with different molecular weight（MW）,and more significant THMs FP increment was observed for the medium weight fraction（10—30 k Da）than for the other fractions.As indicated from the results of UV-Vis and FTIR,the complexation of FA and Cu（Ⅱ）mainly occurred at the functiona lsites such as phenols or alcohols.Cu（Ⅱ）catalyzed the hydrolysis of FA and the chlorination reactions accountable for the promotion of THMs FP（especially for the brominated products）.

关 键 词：CU2+ 三卤甲烷生成能力 超滤 分子量 富里酸 饮用水消毒副产物 

分 类 号：TU991.2[建筑科学—市政工程]