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Ionic-Functionalized Polymers of Intrinsic Microporosity for Gas Separation Applications
Shalini J Rukmani, Thilanga P Liyana-Arachchi, Kyle E Hart1
1Department of Materials Science and Engineering , The Pennsylvania State University , University Park , Pennsylvania 16802 , United States.
Langmuir : the ACS Journal of Surfaces and Colloids
|March 20, 2018
Summary
Ionic-functionalized polymers improve energy-efficient gas separation. Mg2+-functionalized polymers show higher CO2 adsorption and selectivity, crucial for industrial applications like pressure swing adsorption.
Area of Science:
- Materials Science
- Chemical Engineering
- Polymer Chemistry
Background:
- Ionic-functionalized microporous materials offer energy-efficient gas adsorption and separation.
- Polymers of intrinsic microporosity (PIMs) are amorphous polymers with inherent microporosity.
Purpose of the Study:
- To investigate the impact of various counterions (Li+, Na+, K+, Rb+, Mg2+) on the porosity, CO2 adsorption, and selectivity of ionic-functionalized PIM-1 (IonomIMs).
- To understand how ionic group concentration affects gas adsorption and selectivity in IonomIMs.
Main Methods:
- Synthesis and characterization of ionic-functionalized PIM-1 (IonomIMs) with different counterions.
- Gas adsorption and selectivity measurements for CO2, CH4, and N2 mixtures.
Main Results:
- Increased ionic group concentration reduced free volume and porosity.
- Mg2+-functionalized IonomIMs exhibited relatively higher porosity and superior CO2 adsorption capacity.
- IonomIMs demonstrated enhanced CO2 selectivity in CO2/CH4 and CO2/N2 mixtures, relevant for pressure swing adsorption (PSA) and vacuum swing adsorption (VSA) applications.
Conclusions:
- Counterion choice significantly influences the porosity, CO2 adsorption, and selectivity of IonomIMs.
- Mg2+ functionalization offers promising performance for energy-efficient gas separation applications.
- Ionic group concentration is a critical factor in tuning gas adsorption and selectivity properties.
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