Intercalation of small molecules in the selective layer of polyamide nanofiltration membranes facilitates the separation of Mg2+/Li+
(2024) Chemical Engineering Journal — Vol. 487, p. 150659 (2024)
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- Abstract
- In addressing lithium supply shortages driven by increased energy demand, nanofiltration membrane technology is crucial for recovering lithium from salt lake brines. Overcoming the challenge of achieving high selectivity for Li + and water permeability in polymer nanofiltration membranes, this study proposes a simple approach using Aminomalononitrile (AMN) intercalation to modify polyamide layers. Density functional theory simulations predict AMN's superior selectivity and enhanced hydrophilicity. Stable intercalation of AMN between poly-ethyleneimine (PEI) molecules is demonstrated, synergistically enhancing water permeability and Li + selectivity. The resulting PEI/AMN-TMC membrane exhibits exceptional Li + selectivity and improved water permeability (13.1 L⋅m − 2 ⋅h − 1 ⋅bar − 1), 2.9 times higher than traditional PEI-TMC membranes. Stable performance for over seven days, along with anti-scaling and anti-bacterial properties, underscores its practicality. This investigation sheds light on membrane structure regulation through small-molecule intercalation, offering insights into precise adjustments for enhanced water permeability and ion selectivity.
- Affiliations
KU Leuven Department of Chemical Engineering
Citations
Junwei Li, Long Fang, Daliang Xu, Xi Zhang, Lei Jiang, Qingjuan Zhu, Qin Chen, Pengrui Jin, Alexander Volodine, Raf Dewil, Xiahui Gui, Gao, Q., & Bart Van der Bruggen. (2024). Intercalation of small molecules in the selective layer of polyamide nanofiltration membranes facilitates the separation of Mg2+/Li+. Chemical Engineering Journal, 487, 150659. https://doi.org/10.1016/j.cej.2024.150659 (Original work published 2024)