# Behavior of hydrophobic ionic liquids as liquid membranes on phenol removal: Experimental study and optimization

**Authors:** Y. S. Ng, N. S. Jayakumar, M. A. Hashim  
**arXiv:** [1412.1063](https://arxiv.org/abs/1412.1063)  
**Date:** 2014-11-30  
**Summary page:** https://www.summarizepaper.com/en/paper/1412.1063v1/

## Key points

- Room temperature ionic liquids are a promising alternative to traditional organic membrane solvents
- Advantages of room temperature ionic liquids include low vapor pressure, low volatility, and high stability
- Study by Y. S. Ng, N. S. Jayakumar, and M. A. Hashim investigated the feasibility of using room temperature ionic liquids as bulk liquid membranes for phenol removal
- Researchers focused on three specific hydrophobic ionic liquids and evaluated their efficiency in removing phenol, stability, and membrane loss
- Various parameters like feed phase pH, feed concentration, NaOH concentration, and stirring speeds were varied to assess impact on performance of the best ionic liquid membrane
- Optimization study conducted to determine maximum phenol removal efficiency with bulk ionic liquid membranes compared to organic liquid membranes
- Results showed impressive phenol extraction (96.21%) and stripping (98.10%) efficiencies with minimal membrane loss using ionic liquid membrane
- Research highlights potential of room temperature ionic liquids as effective alternatives for phenol removal applications compared to traditional organic membrane solvents

## Summary

Room temperature ionic liquids have emerged as a promising alternative to traditional organic membrane solvents due to their advantageous properties such as low vapor pressure, low volatility, and high stability. In a recent study conducted by Y. S. Ng, N. S. Jayakumar, and M. A. Hashim, the feasibility of utilizing room temperature ionic liquids as bulk liquid membranes for phenol removal was investigated experimentally. The researchers focused on three specific ionic liquids known for their high hydrophobicity and examined their efficiency in removing phenol, as well as the stability and loss of the membranes. Additionally, various parameters including feed phase pH, feed concentration, NaOH concentration, and stirring speeds were varied to evaluate their impact on the performance of the best ionic liquid membrane. Furthermore, an optimization study was carried out to determine the maximum phenol removal efficiency achievable with bulk ionic liquid membranes compared to organic liquid membranes. The results of the preliminary study demonstrated that the ionic liquid membrane exhibited impressive phenol extraction and stripping efficiencies of 96.21% and 98.10%, respectively, with minimal membrane loss. Overall, this research highlights the potential of room temperature ionic liquids as effective alternatives for phenol removal applications in comparison to traditional organic membrane solvents. The findings suggest that utilizing ionic liquid membranes could offer improved efficiency and sustainability in various separation processes involving phenolic compounds.