垃圾渗滤液中溶解有机质与内分泌干扰物的吸附机理

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. 

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

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,Kf,and the logarithm value of Kow or Kdoc 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.