垃圾渗滤液中溶解有机质与内分泌干扰物的吸附机理

张彩香; 王焰新; 祁士华; 杨志华

垃圾渗滤液中溶解有机质与内分泌干扰物的吸附机理

中国地质大学生物地质与环境地质教育部重点实验室, 湖北武汉 430074

基金项目:

国家杰出青年科学基金 40425001

详细信息

作者简介:
张彩香(1970-), 女, 副教授, 博士, 主要从事污染控制工作.E-mail: zeno448@163.com

中图分类号: O62
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出版历程
- 收稿日期: 2008-03-11
- 刊出日期: 2008-05-25

Adsorption Mechanisms between Dissolved Organic Matter and Endocrine Disruptors from Landfill Leachate

Key Laboratory of Biogeology and Environmental Geology of Ministry of Education, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 为了调查垃圾渗滤液中的溶解有机质(DOM) 及内分泌干扰物(EEDs) 的相互作用机理, 在实验室条件下研究了DOM对EEDs如双酚A (BPA)、雌二醇(E₂)和雌酮(E₁) 的吸附等温线, 并通过FTIR、¹HNMR和ESR技术, 分析了DOM与EEDs的吸附机理.结果表明, 垃圾渗滤液中DOM对3种EEDs的吸附等温线符合Freundlich方程, 并且可用DOM与EEDs的吸附常数Kf预测EEDs的辛醇/水分配系数(K_ow) 或有机碳分配系数(K_doc), 其中直线回归方程为: lgK_doc=2.062K_f-5.065 (R₂=0.9958, P=0.041 < 0.05).分析也表明DOM吸附EEDs的吸附过程至少存在离子键、共价键和电荷转移等多种吸附机制的协同作用.
- 渗滤液 /
- 溶解有机质 /
- 内分泌干扰物 /
- 吸附等温线 /
- 吸附机理
Abstract: To understand the interactions between dissolved organic matter (DOM) and environmental endocrine disruptors (EEDs) in landfill leachate, sorption experiments and the interaction between targets EEDs, including BPA, E₂, E₁, and DOM from leachate were investigated.It was found that adsorption isotherms fit the Freundlich equation well.The regression equation between binding coefficient, K_f, and the logarithm value of K_ow or K_doc of compounds was determined (R₂=0.995 8, P=0.041 < 0.05).Both the unreacted DOM and the DOM that reacted with EEDs were analyzed by FTIR, 1HNMR and ESR.The results suggested that multiple binding mechanisms might occur simultaneously in the adsorption process with the formation of (1) ionic bonds (proton-transfer) between carboxylate groups of DOM and positively charged compounds; (2) hydrogen bonds between structure moieties of EEDs and DOM; and (3) charge-transfer bonds in electron donor-acceptor processes.
- landfill leachate /
- dissolved organic matter (DOM) /
- environmental endocrine disruptors (EEDs) /
- adsorption isotherm /
- adsorption mechanisms

HTML全文

图 1 DOM与内分泌干扰物的吸附等温线

Fig. 1. Adsorption isotherms for the bound with EEDs

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图 2 BPA、E₂和E₁混标的HPLC图谱

Fig. 2. HPLC of the mix ture of standard EEDs

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图 3 未键合的DOM及键合后的DOM的红外光谱图

Fig. 3. FTIR of DOM and bound DOM with EEDs

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图 4 未键合DOM与键合后DOM的质子核磁共振图谱

Fig. 4. ¹H NMR spectra of R1-3 and bound R1-3 with BPA, E₂ and E₁

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表 1 内分泌干扰物Freundlich方程拟合结果

Table 1. Isotherm parameters determined by Freundlich equation

表 2 未键合DOM和键合EEDs后的DOM ESR参数

Table 2. ESR data of R1-3 and the bound R1-3 with EEDs

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