Membrane Design Principles for Ion-Selective Electrodialysis: An Analysis for Li/Mg Separation.

ABSTRACT: Selective electrodialysis (ED) is a promising membrane-based process to separate Li⁺ from Mg²⁺, which is the most critical step for Li extraction from brine lakes. This study theoretically compares the ED-based Li/Mg separation performance of different monovalent selective cation exchange membranes (CEMs) and nanofiltration (NF) membranes at the coupon scale using a unified mass transport model, i.e., a solution-friction model. We demonstrated that monovalent selective CEMs with a dense surface thin film like a polyamide film are more effective in enhancing the Li/Mg separation performance than those with a loose but highly charged thin film. Polyamide film-coated CEMs when used in ED have a performance similar to that of polyamide-based NF membranes when used in NF.

SUBMITTER: Wang R 

PROVIDER: S-EPMC10882969 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature