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Dispersive liquid-liquid microextraction of zinc from environmental water samples using ionic liquid
Chemical Engineering Communications ( IF 2.5 ) Pub Date : 2021-01-04 , DOI: 10.1080/00986445.2020.1865935
Preethi A 1 , Vijayalakshmi R 1 , Brinda Lakshmi A 1
Affiliation  

Abstract

In this work, the Dispersive Liquid-Liquid Microextraction (DLLME) method has intensified the extraction of Zinc from aqueous solution utilizing 1-butyl-3-methylimidazolium hexafluorophosphate [BMIM][PF6] and the retrieved metal was analyzed using UV-Vis spectrophotometer. Several extraction factors such as the volume of extraction solvent, centrifugation speed, pH, salt effect, the volume of dispersive solvent, sonication time, and temperature on extraction recovery using conventional DLLME, Temperature-controlled DLLME, and Ultrasound-assisted DLLME methods, respectively, were investigated. In the comparison of these three methods, the maximum extraction recovery was attained by the Ultrasound-assisted DLLME method with the optimum conditions of 60 µl extractant volume, 0.75 ml of dispersive solvent, 3000 rpm centrifugation speed at the pH of 6, and the temperature of 40 °C with 2 min of sonication. The ionic liquid used in the extraction process was completely recovered by sulfuric acid as a stripping agent and reused several times with less loss in its efficiency. The Ultrasound-assisted DLLME method was successfully applied to electroplating industrial effluent under the experimental optimum conditions and the extraction recovery was achieved by 87.4%.



中文翻译:

使用离子液体从环境水样品中进行锌的液-液微分散萃取

摘要

在这项工作中,分散液-液微萃取(DLLME)方法增强了使用六氟磷酸1-丁基-3-甲基咪唑鎓[BMIM] [PF 6 ]从水溶液中萃取锌的能力。],然后使用UV-Vis分光光度计分析回收的金属。分别使用常规DLLME,温控DLLME和超声辅助DLLME方法提取萃取溶剂的体积,离心速度,pH,盐效应,分散溶剂的体积,超声处理时间和温度对萃取回收率等几个萃取因子的影响,进行了调查。在这三种方法的比较中,通过超声波辅助的DLLME方法获得了最大的萃取回收率,最佳条件是萃取剂体积为60 µl,分散溶剂为0.75 ml,pH为6时离心速度为3000 rpm。在40°C下进行2分钟的超声处理。萃取过程中使用的离子液体已通过硫酸作为汽提剂完全回收,并多次重复使用,效率损失较小。在最佳实验条件下,超声辅助DLLME法成功应用于工业废水的电镀,提取回收率达到87.4%。

更新日期:2021-01-04
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