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

化学 扩散 渗透 吸附 聚合物 高分子化学 离子 电导率 聚合 化学工程 热力学 物理化学 有机化学 工程类 吸附 物理 生物化学
作者
Ni Yan,Rahul Sujanani,Jovan Kamcev,Eui Soung Jang,Kentaro Kobayashi,Donald R Paul,Benny D. Freeman
出处
期刊:Journal of Membrane Science [Elsevier BV]
卷期号:653: 120549-120549 被引量:7
标识
DOI:10.1016/j.memsci.2022.120549
摘要

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. This discrepancy might result from interactions not captured by the Mackie and Meares model (e.g., fixed charge-ion interactions).
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