Abbreviation (ISO4): Prog Chem
Editor in chief: Jincai ZHAO
Targeted Construction of Highly Selective Nanofiltration Membranes for Lithium-Magnesium Separation Based on the Sieving Mechanisms and Separation Models
Shichen Xiao, Xinyue Zhang, Xudong Wang, Lei Wang
Prog Chem ›› 2025, Vol. 37 ›› Issue (6) : 868-881.
Targeted Construction of Highly Selective Nanofiltration Membranes for Lithium-Magnesium Separation Based on the Sieving Mechanisms and Separation Models
As a globally strategic resource, lithium resources are crucial for the development of new energy sources. Due to the similar physical and chemical properties of lithium and magnesium, lithium extraction from saline lakes with high Mg/Li ratios is a great challenge. Therefore, it is of great significance to reverse customize nanofiltration (NF) membranes with high performance according to targeted applications. This article discusses the separation mechanisms such as size exclusion, dehydration effect, Donnan effect, and dielectric exclusion, guiding composite film creation for excellent Li⁺/Mg²⁺ sieving from a theoretical direction. Besides, based on the above separation mechanisms, this paper first comprehensively summarizes existing models (non-equilibrium thermodynamic model, charge model, steric hindrance pore model, etc.) for evaluating composite film parameters, which effectively reduces the number of experiments for the preparation of high-performance NF film in the early stage. Finally, we discuss the importance of utilizing the synergy of principles and models to jointly guide the construction of NF membranes that can effectively separate Li⁺/Mg²⁺ and point out that in the future, the structural parameters of the customized NF membranes should be more precise, and the construction of the separation models should be more relevant to the real scenario, so as to better guide the synthesis of NF films with superior separation performance.
1 Introduction
2 Exploration of separation mechanisms
2.1 Size exclusion
2.2 Dehydration effect
2.3 Donnan effect
2.4 Dielectric exclusion
2.5 Compensatory effect
2.6 Hydrophobic adsorption
3 Exploration of separation models
3.1 Non-equilibrium thermodynamics model
3.2 Steric hindrance pore model
3.3 Charge model
3.4 Electrostatic and steric-hindrance model
3.5 Donnan-steric pore model
3.6 Donnan-steric pore model with dielectric exclusion
3.7 Semi-empirical model
4 Conclusion and outlook
nanofiltration / lithium-magnesium separation / mono/divalent ions / separation mechanisms / separation models
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