期刊
JOURNAL OF MEMBRANE SCIENCE
卷 663, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.memsci.2022.121027
关键词
Nanofiltration; Layer-by-layer; Mg2+; Li plus separation; Separation factor
资金
- National Natural Science Foundation of China [U20A20139, 51861145313, 52011530031]
- CAS International Collaboration [184131KYSB20190026]
- US National Science Foundation [2017998]
- Water Research Foundation (Paul L. Busch Award)
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [2017998] Funding Source: National Science Foundation
This study investigates the effects of solution parameters on the Mg2+/Li+ separation performance of poly(styrene sulfonate) and poly(allylamine hydrochloride) (PSS/PAH) hollow fiber NF membranes. The results show that pH has a significant impact on the separation performance, while the effects of salinity and Mg2+/Li+ mass ratio depend on whether the membranes are crosslinked. The PSS/PAH NF membranes demonstrate exceptional Mg2+/Li+ separation unmatched by commercial NF membranes.
To separate Li + ions from Mg2+ ions rich salt-lake brine using nanofiltration (NF), high-performance NF membranes capable of achieving a high Mg2+/Li+ separation factor in a wide range of solution conditions are critical. In this study, we investigated the impacts of three key solution parameters, including pH, salinity, and Mg2+/Li+ mass ratio, on the performance of Mg2+/Li+ separation by poly(styrene sulfonate) and poly(allylamine hydrochloride) (PSS/PAH) hollow fiber NF membranes fabricated using in-module layer-by-layer deposition with and without crosslinking. We found that lower pH generally favors better Mg2+/Li+ separation, whereas the impacts of salinity and Mg2+/Li + mass ratio on Mg2+/Li + separation depend on whether the membranes are crosslinked. The dependence of Mg2+/Li+ separation performance on the solution conditions and membrane properties is intricate but can nonetheless be qualitative explained using the existing framework of multi-ion transport described by the solution-diffusion-electromigration model (SDEM). Regardless of solution condi-tions and whether crosslinking was applied, the PSS/PAH NF membranes were capable of achieving exceptional Mg2+/Li+ separation unmatched by commercial NF membranes.
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