CO2 capture by polyethylenimine-modified fibrous adsorbent.

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Developing efficient adsorbents is crucial for carbon dioxide (CO2) capture technologies.
• Polyethylenimine (PEI) is a promising material for CO2 adsorption.
• Improving the performance and stability of PEI-based adsorbents is an active research area.

Purpose of the Study:

• To develop a novel fibrous adsorbent for CO2 capture by coating PEI on a glass fiber matrix.
• To investigate the effect of epichlorohydrin (ECH) as a cross-linking agent on CO2 adsorption properties.
• To compare the performance of the PEI-ECH adsorbent with a previously developed PEI-epoxy resin adsorbent.

Main Methods:

• Coating polyethylenimine (PEI) onto a glass fiber matrix.
• Cross-linking the PEI coating using epichlorohydrin (ECH).
• Characterization of the adsorbent's physicochemical properties.
• Evaluation of CO2 adsorption capacity and regeneration performance.

Main Results:

• The PEI-ECH fibrous adsorbent demonstrated significantly higher CO2 adsorption capacity compared to PEI-epoxy resin.
• A maximum CO2 adsorption capacity of 4.12 mmol CO2/g adsorbent (13.56 mmol CO2/g PEI) was achieved at 30°C with a PEI/ECH ratio of 20:1.
• Complete regeneration of the adsorbent was achieved at 120°C.

Conclusions:

• The novel fibrous PEI-ECH adsorbent offers superior CO2 capture performance.
• ECH is an effective cross-linking agent for enhancing PEI-based CO2 adsorbents.
• The developed adsorbent shows potential for practical CO2 capture applications due to its high capacity and regenerability.