离子液体与传统有机溶剂萃取性能的比较研究付新梅
离子液体,,离子液体，二氯甲烷,萃取性能，壬基酚，辛基酚,摘要,关键词,1引言,2实验部分,3结果与讨论,References
摘 要利用离子液体1甲基3丁基咪唑六氟磷酸盐(C4)和1甲基3己基咪唑六氟磷酸盐(C6)以及传统有机溶剂二氯甲烷作萃取溶剂，研究了它们在不同条件下萃取水环境中的环境内分泌干扰物壬基酚和辛基酚的萃取性能，结果表明，二氯甲烷达萃取平衡的时间(20 min)比离子液体(60 min)短；当水相的pH值发生变化时，离子液体和二氯甲烷的萃取率均随pH值的增大而降低；盐析效应显示离子液体受盐效应影响很小，而二氯甲烷受盐效应的影响大；壬基酚和辛基酚浓度增大导致萃取率降低; 离子液体和二氯甲烷的萃取率均随温度的升高而升高，适当的提高温度有利于萃取率的提高。用离子液体萃取水溶液中有机物质，表现出和传统萃取溶剂相类似的一些性质，如酸度、温度、分析物的浓度均对其萃取率有一定影响。
关键词 离子液体，二氯甲烷,萃取性能，壬基酚，辛基酚
Comparison of Extraction Abilities Between Ionic Liquids and Dichloromethane
Fu Xinmei, Dai Shugui*, Zhang Yu
(College of Environmental Science & Engineering, Nankai University, Tianjin 300071)
Abstract Comparison of extraction abilities among 1butyl3methylimidazolium hexafluorophosphate (C4), 1hexyl3methylimidazolium hexafluorophosphate (C6) and a traditional organic solvent, dichloromethane, was made in the extraction of 4nonylphenol (NP) and 4tertOctylphenol (OP) from water samples under different conditions. The results indicated that the extraction time leading to equilibrium was shorter in dichloromethane (20 min) than that in ionic liquids C4 and C6 (60 min). When the pH in water increased from 1 to 13, the extraction efficiency of ionic liquid C4 decreased from 72% to 35% for OP, 61% to 34% for NP and the extraction efficiency of ionic liquid C6 decreased from 68% to 25% for OP, 56% to 28% for NP; the extraction efficiency of dichloromethane decreased from 75% to 44% for OP and 72% to 48% for NP. From the saltout effect results, it was concluded that the saltout effect on ionic liquids was less significant than on dichloromethane. The extraction efficiencies were also influenced by the OP and NP concentration and were decreased as the analytes concentration increased from 10 μg/L to 100 μg/L. The extraction capacities of dichloromethane (37.5 μg/L) on analytes were higher than those of ionic liquids (20-30 μg/L). The extraction efficiency of ionic liquids and dichloromethane increased as temperature rose from 25℃ to 55℃. When ionic liquids were used to extract organic chemicals, the similar extraction properties were found between ionic liquids and dichloromethane i.e. their extraction efficiency could be affected by acidity, temperature and analytes concentrations. ......
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