Page 180 - 《精细化工》2021年第3期

第 38 卷第 3 期 精 细 化 工 Vol.38, No.3
202 1 年 3 月 FINE CHEMICALS Mar. 2021

水处理技术与环境保护
2+
双硫腙-Bmim[PF ]对水中 Pb 的萃取分离性能初探
6

刘 娟 1,2 ，贾 悦 1,2* ，吕晓龙 1,2* ，韩善慧 1,3 ，陈华艳 1,2

（1. 省部共建分离膜与膜过程国家重点实验室，天津 300387；2. 天津工业大学 材料科学与工程学院，
天津 300387；3. 天津工业大学 环境科学与工程学院，天津 300387）

2+
摘要：采用双硫腙-离子液体 1-丁基-3-甲基咪唑六氟磷酸盐（[Bmim][PF 6 ]）对水中 Pb 的萃取性能进行了考察。
2+
探究了络合剂含量、萃取温度、料液相 pH、萃取体系与水相体积比及干扰离子对 Pb 萃取率的影响；此外，在
最佳萃取条件下，进行了反萃剂的筛选，考察了反萃剂浓度及反萃温度对反萃率的影响。结果表明，在萃取温
度为 35 ℃、料液相 pH 为 6、络合剂双硫腙含量（以离子液体的质量计，下同）为 0.72%、萃取体系与水相体
2+
2+
2+
积比为 1∶4 的条件下，该萃取体系对水中 Pb 的萃取率高达 98.0%。Cu 、Zn 2+ 和 Ni 2+ 的共存对 Pb 的萃取
2+
率影响较小，该体系适用于 Pb 的选择性提取。在 35 ℃下，采用 1.00 mol/L HNO 3 溶液对负载萃取体系进行反
2+
萃，Pb 反萃率可达 97.0%。最后，探讨了该萃取与反萃体系多次复用的传质效率变化趋势，发现 3 次萃取/反
萃后该体系萃取率依然可达 80.0%，反萃率为 65.0%。
关键词：萃取；反萃；离子液体；铅离子；重金属离子；水处理技术
中图分类号：X703; O658.2 文献标识码：A 文章编号：1003-5214 (2021) 03-0600-06

Preliminary study on extraction and separation performances of
2+
dithizone-Bmim[PF 6] for Pb in water

1,2
1,2
1,3
LIU Juan , JIA Yue 1,2* , LYU Xiaolong 1,2* , HAN Shanhui , CHEN Huayan
（1. State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin 300387, China; 2. School of
Material Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, China; 3. School of Environmental
Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, China）

Abstract: Extraction performances of Pb 2+ in water were investigated by dithizone-ionic liquid
1-butyl-3-methylimidazole hexafluorophosphate ([Bmim][PF 6]). The effects of complexing agent content,
extraction temperature, pH of liquid phase, volume ratio of extraction system to water phase and
2+
interference ions on the extraction rate of Pb were studied. In addition, the stripping agent was screened
under the optimal extraction conditions. The effects of stripping agent concentration and stripping
2+
temperature on the stripping rate were explored. The results showed that the extraction rate of Pb from
water was as high as 98.0% under the optimal conditions of extraction temperature of 35 ℃, pH = 6,
complexing agent dithizone content (based on the mass of ionic liquid, the same below) of 0.72%, and
2+
2+
2+
volume ratio of extraction system to water phase of 1∶4. The coexistence of Cu , Zn and Ni had little
2+
2+
influence on the extraction rate of Pb , so this system was suitable for the selective extraction of Pb .
2+
When 1.00 mol/L HNO 3 solution was used as stripping agent at 35 ℃, the stripping rate of Pb was 97.0%.
Finally, the trend of mass transfer efficiencies in the multiple reuse of the extraction/stripping system were
investigated. It was found that the extraction rate and stripping rate of the system still reached 80.0% and
65.0% after three times of extraction and stripping.
2+
Key words: extraction; stripping; ionic liquid; Pb ; heavy metal ions; water treatment technology

收稿日期：2020-08-21; 定用日期：2020-10-20; DOI: 10.13550/j.jxhg.20200780
基金项目：天津市自然科学基金（17JCYBJC17400）
作者简介：刘 娟（1996—），女，硕士生，E-mail: 1915383541@qq.com。联系人：贾 悦（1977—），副研究员，E-mail:
jiayue@tiangong.edu.cn；吕晓龙（1964—），研究员，E-mail: 13920286131@163.com。