Abstract
The separation of specific ions is common in chemical processes, including lithium mining, hydrometallurgy, and biochemical engineering. The monovalent cation perm-selective membrane is a vital material for ion classification. Although many advanced membranes with sufficient permeability and selectivity were developed, the systematical relationships between membrane function and ion transport character are still unclear. In this work, we successfully developed a two-dimensional model based on Navier-Stokes and Nernst-Planck-Poisson equations asserted through numerical simulation. The impact of modified layer's thickness, fixed charge concentration, as well as base membrane fixed charge density on ion flux and selectivity were thoroughly investigated. The combined contribution of membrane properties on the trade-off between ion selectivity and permeability was thus established using this innovative simulation and modeling strategy. This is the first systematic research to provide a substantial reference for the development of advanced cation perm-selective membranes for monovalent ions isolation.
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