Design and Synthesis of Piperazine-Based Task-Specific Ionic Liquids for Liquid–Liquid Extraction of CuII, NiII, and CoII from Water
Weiyuan Xu A , Liang Wang B , Jianying Huang A , Gerui Ren A C , Dandan Xu A and Haihe Tong A
+ Author Affiliations
- Author Affiliations
A Key Laboratory of Fruits and Vegetables Postharvest and Processing Technology Research of Zhejiang Province, College of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, China.
B Zhejiang Province Radiation Environmental Monitoring Center, Hangzhou 310012, China.
C Corresponding author. Email: rengerui@zjgsu.edu.cn
Australian Journal of Chemistry 68(5) 825-829 https://doi.org/10.1071/CH14351
Submitted: 31 May 2014 Accepted: 7 August 2014 Published: 15 October 2014
Abstract
The novel synthesis of task-specific ionic liquids (TSILs) introducing piperazine substructures was described. Piperazine functional groups were easily grafted onto an imidazolium cationic derivative via a simple four-step process starting from available materials such as imidazole, ethylene glycol, and 1-butylamine or 3-dimethylaminopropylamine. Effects of pH, temperature, and structure of functional groups on the performance of liquid–liquid extraction of Cu2+, Ni2+, and Co2+ from water were investigated. It was found that TSILs were efficient for removal of these metal ions in mild acid solutions. The TSIL with an extra nitrogen atom showed a higher capability to separate metal ions, especially for Cu2+. This may be ascribed to the intrinsic structure of the functional groups – the more coordination sites, the higher the affinity for the metal ions. Furthermore, the thermodynamics indicated that the extraction process was exothermic and spontaneous in nature.
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