H 2 O and CO 2 Sorption in Ion-Exchange Sorbents: Distinct Interactions in Amine Versus Quaternary Ammonium Materials

Tomaraei, Golnaz Najaf [Northern Arizona University, Flagstaff, AZ (United States)]; Binney, Sierra [Northern Arizona University, Flagstaff, AZ (United States)]; Stratton, Ryan [Northern Arizona University, Flagstaff, AZ (United States)]; Zhuang, Houlong [Arizona State University, Tempe, AZ (United States)] (ORCID:0000000172767938); Wade, Jennifer L. [Northern Arizona University, Flagstaff, AZ (United States)] (ORCID:0000000183727800)

doi:10.1021/acsami.5c12939

DOE OSTI · 2884529

H 2 O and CO 2 Sorption in Ion-Exchange Sorbents: Distinct Interactions in Amine Versus Quaternary Ammonium Materials

Tomaraei, Golnaz Najaf [Northern Arizona University, Flagstaff, AZ (United States)]·Binney, Sierra [Northern Arizona University, Flagstaff, AZ (United States)]·Stratton, Ryan [Northern Arizona University, Flagstaff, AZ (United States)]·Zhuang, Houlong [Arizona State University, Tempe, AZ (United States)] (ORCID:0000000172767938)·Wade, Jennifer L. [Northern Arizona University, Flagstaff, AZ (United States)] (ORCID:0000000183727800)

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Abstract

This article examines how water (H₂O) and carbon dioxide (CO₂) interact with two classes of ion-exchange sorbents — a primary amine sorbent and a quaternary ammonium (QA⁺) sorbent — using calorimetry, thermal gravimetric analysis, gas analysis, and molecular modeling. Here, the QA⁺ sorbent exhibits stronger binding to both H₂O and CO₂ but also shows thermal stability limitations. Mixed-gas experiments reveal that humidity strongly influences CO₂ uptake and that moisture-driven sorbent regeneration enables cyclic moisture swing CO₂ capture, with implications for low-energy CO₂ separation from dilute gas streams.

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36 MATERIALS SCIENCE 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY CO₂ separation CO₂ sorption Clausius–Clapeyron GAB model H₂O sorption Quaternary ammonium sorbents amine sorbents calorimetry chemisorption direct air capture ion-exchange sorbents primary amine quaternary ammonium sorption isotherm thermal gravimetric analysis

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Tomaraei, Golnaz Najaf [Northern Arizona University, Flagstaff, AZ (United States)], Binney, Sierra [Northern Arizona University, Flagstaff, AZ (United States)], Stratton, Ryan [Northern Arizona University, Flagstaff, AZ (United States)], Zhuang, Houlong [Arizona State University, Tempe, AZ (United States)] (ORCID:0000000172767938), Wade, Jennifer L. [Northern Arizona University, Flagstaff, AZ (United States)] (ORCID:0000000183727800). 2025-09-09. H 2 O and CO 2 Sorption in Ion-Exchange Sorbents: Distinct Interactions in Amine Versus Quaternary Ammonium Materials. https://doi.org/10.1021/acsami.5c12939

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36 MATERIALS SCIENCE subject 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY subject CO2 separation subject CO2 sorption subject Clausius–Clapeyron subject Direct Air Capture subject GAB model subject H2O sorption subject Quaternary ammonium sorbents subject amine sorbents subject calorimetry subject chemisorption subject ion-exchange sorbents subject primary amine subject quaternary ammonium subject sorption isotherm subject

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