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Selective Toluene Separation via π-π Interactions in Cobalt sql Network Rubber Composites.

Guo-Bi Li¹, Jing Chen¹, Bai-Qiao Song²

¹School of Chemistry and Chemical Engineering, Lingnan Normal University, Zhanjiang 524048, P.R. China.

ACS Applied Materials & Interfaces

|September 2, 2025

Summary

A new hybrid membrane effectively removes toluene, a common aromatic contaminant, from water using selective molecular recognition. This advanced material offers high purity and recovery for environmental remediation.

Keywords:

composite films coordination networks naphthalene diimide toluene extraction water remediation

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Published on: October 10, 2016

Area of Science:

Materials Science
Environmental Chemistry
Nanotechnology

Background:

Aromatic contaminants in water pose environmental challenges.
Developing materials for selective contaminant removal is crucial for remediation.

Purpose of the Study:

To design and characterize a framework-elastomer hybrid membrane for selective toluene recovery.
To investigate the molecular recognition mechanisms for toluene separation.

Main Methods:

Fabrication of a hybrid membrane with [Co(4-pmntd)2(NO3)2] (4-pmntd = N,N'-bis(4-pyridylmethyl)naphthalene diimide).
Structural analysis using crystallographic diffraction, gas adsorption, spectroscopy, and NMR.
Computational modeling with GCMC and DFT-D to study sorption pathways.

Main Results:

The membrane demonstrated high selectivity for toluene via π-π charge-transfer interactions.
Achieved toluene detection at 5.3 × 10⁻⁶ mol/L with 97.6% purity and 94.0% recovery.
The material showed rapid kinetics, ambient temperature operation, and excellent recyclability.

Conclusions:

The developed hybrid membrane is a sustainable solution for industrial toluene remediation.
Advances coordination-network-based separation technology for environmental water treatment.
Confirms selective molecular recognition mechanism through computational and experimental validation.