Synthesis of Ionic Liquids Containing the Hydroxyl Functionality for Extracting Nonylphenol and Octylphenol in Water

Abstract

A new series of task-specific ionic liquids (TSILs) containing hydroxyl groups was prepared and applied for extracting 4-nonylphenol (4-NP) and 4-tert-octylphenol (4-t-OP) in water. These new TSILs showed much greater extraction efficiencies for 4-NP and 4-t-OP than the common typical ionic liquids 1-butyl-3-methylimidazolium hexafluorophosphate ([C₄mim][PF₆]) and 1-hexyl-3-methylimidazolium hexafluorophosphate ([C₆mim][PF₆]).

Keywords:

• Hydroxyl group
• nonylphenol
• octylphenol
• task-specific ionic liquid

ACKNOWLEDGMENTS

This work was supported by the National Natural Science Foundation of China (20377025) and the Scientific Research Foundation of Southwest University of Science and Technology (06ZX7116).

Notes

^a Residual volume of TSILs after extraction.