Transport and Structural Characteristics of Heterogeneous Ion-Exchange Membranes with Varied Dispersity of the Ion Exchanger

IF 2 Q4 CHEMISTRY, PHYSICAL Membranes and Membrane Technologies Pub Date : 2024-05-09 DOI:10.1134/S2517751624020082
V. I. Vasil’eva, E. E. Meshcheryakova, O. I. Chernyshova, M. A. Brovkina, I. V. Falina, E. M. Akberova, S. V. Dobryden’
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Abstract

The structural and transport (conductivity, diffusion permeability) properties of cation- and anion-exchange membranes with varied dispersity of ion-exchange resin particles are studied in the work. Experimental MK-40 cation-exchange and MA-41 anion-exchange membranes with variable particle size of the ion-exchange resin of <20 to <71 μm were manufactured at LLC IE Shchekinoazot (Russia). A comparative analysis of the structural characteristics of the membranes by SEM reveals the anisotropy in the properties of the surface and section. The internal phase of the membrane is characterized by high values of the fraction and sizes of the ion exchanger and macroporosity. A comparison of the concentration dependences of the specific conductivity and diffusion permeability of the experimental membranes is performed. The analysis of the values of the model transport-structural parameters shows that an increase in the conductivity of the gel phase from 0.39 up to 0.47 S/m and from 0.15 up to 0.26 S/m for cation- and anion-exchange membranes, respectively, as well as redistribution of current transfer paths in the membrane are observed in the case of a decrease in the particle size of the ion exchanger. An increase in the contribution from transfer of the internal equilibrium solution along the channel is revealed; here, the transfer numbers of counterions slightly change. Information about the changes in the structure of the transport channels in membranes with different particle sizes of the ion exchanger obtained based on the analysis of the model parameters is consistent with the data of independent studies of the morphology of their surface and section by SEM.

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离子交换剂分散度不同的异质离子交换膜的传输和结构特征
摘要 研究了离子交换树脂颗粒分散度不同的阳离子和阴离子交换膜的结构和传输(导电性、扩散渗透性)特性。实验用的 MK-40 阳离子交换膜和 MA-41 阴离子交换膜是在 LLC IE Shchekinoazot(俄罗斯)生产的,离子交换树脂的颗粒大小从 20 微米到 71 微米不等。通过扫描电子显微镜对膜的结构特征进行比较分析,发现膜的表面和截面具有各向异性。膜内相的特点是离子交换剂和大孔的比例和尺寸值较高。对实验膜的比电导率和扩散渗透率的浓度依赖性进行了比较。对模型传输结构参数值的分析表明,阳离子交换膜和阴离子交换膜的凝胶相电导率分别从 0.39 S/m 增加到 0.47 S/m,从 0.15 S/m 增加到 0.26 S/m,在离子交换剂颗粒尺寸减小的情况下,膜中的电流传输路径也会重新分布。内部平衡溶液沿通道转移的贡献增加;在此,反离子的转移数量略有变化。根据对模型参数的分析获得的关于不同离子交换剂粒度的膜中传输通道结构变化的信息,与通过扫描电子显微镜对其表面和截面形态进行独立研究的数据是一致的。
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来源期刊
CiteScore
3.10
自引率
31.20%
发文量
38
期刊介绍: The journal Membranes and Membrane Technologies publishes original research articles and reviews devoted to scientific research and technological advancements in the field of membranes and membrane technologies, including the following main topics:novel membrane materials and creation of highly efficient polymeric and inorganic membranes;hybrid membranes, nanocomposites, and nanostructured membranes;aqueous and nonaqueous filtration processes (micro-, ultra-, and nanofiltration; reverse osmosis);gas separation;electromembrane processes and fuel cells;membrane pervaporation and membrane distillation;membrane catalysis and membrane reactors;water desalination and wastewater treatment;hybrid membrane processes;membrane sensors;membrane extraction and membrane emulsification;mathematical simulation of porous structures and membrane separation processes;membrane characterization;membrane technologies in industry (energy, mineral extraction, pharmaceutics and medicine, chemistry and petroleum chemistry, food industry, and others);membranes and protection of environment (“green chemistry”).The journal has been published in Russian already for several years, English translations of the content used to be integrated in the journal Petroleum Chemistry. This journal is a split off with additional topics.
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