Salt and ion transport in a series of crosslinked AMPS/PEGDA hydrogel membranes

Yan, Ni; Sujanani, Rahul; Kamcev, Jovan; Jang, Eui-Soung; Kobayashi, Kentaro; Paul, Donald R.; Freeman, Benny D.

doi:10.1016/j.memsci.2022.120549

Salt and ion transport in a series of crosslinked AMPS/PEGDA hydrogel membranes

Journal Article · Fri Apr 08 00:00:00 EDT 2022 · Journal of Membrane Science

DOI:https://doi.org/10.1016/j.memsci.2022.120549· OSTI ID:1977443

Yan, Ni ^[1]; Sujanani, Rahul ^[2]; Kamcev, Jovan ^[3]; Jang, Eui-Soung ^[2]; Kobayashi, Kentaro ^[2]; Paul, Donald R. ^[2]; Freeman, Benny D. ^[2]

Univ. of Texas, Austin, TX (United States); OSTI
Univ. of Texas, Austin, TX (United States)
Univ. of Michigan, Ann Arbor, MI (United States)

Salt permeability and ionic conductivity are critical properties for membranes in water purification and energy applications. Both properties depend on individual ion sorption and diffusion coefficients, which are significantly influenced by polymer chemical and physical parameters such as fixed charge concentration and membrane water content. However, systematic studies connecting polymer structure to ion transport properties are still lacking. In this study, a series of uncharged and charged membranes were synthesized using poly(ethylene glycol) diacrylate (PEGDA) as a cross-linker and 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) as a charged monomer. Membrane fixed charge concentration and water uptake were systematically varied by adjusting AMPS content in the pre-polymerization mixture. Salt sorption and permeability coefficients and ionic conductivity of these membranes were measured as a function of NaCl solution concentration (0.01–1 M). Combining the solution-diffusion model and Nernst-Planck equation, individual ion diffusion coefficients were calculated. Experimental Na⁺ diffusion coefficients for all materials were well described by the Mackie and Meares tortuosity model, highlighting the strong influence of water content on ion diffusivity in both uncharged and charged polymers. Model predictions for Cl^– diffusion coefficients agree reasonably well with experimental values, with some deviations occurring in more highly charged membranes. Finally, this discrepancy might result from interactions not captured by the Mackie and Meares model (e.g., fixed charge-ion interactions).

View Accepted Manuscript (DOE)

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Materials for Water and Energy Systems (M-WET); Univ. of Texas, Austin, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0019272

OSTI ID:: 1977443

Journal Information:: Journal of Membrane Science, Journal Name: Journal of Membrane Science Journal Issue: C Vol. 653; ISSN 0376-7388

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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