With the rapid advancement of the renewable energy industry, the strategic significance of precise pore size regulation in nanofiltration membranes (NF) has become a central research focus, particularly as a critical technical pathway for ion separation challenges such as lithium extraction from salt lake brines. This review summarizes recent research progress in pore size regulation methods for NF and discusses the challenges of separating ions with similar sizes, such as magnesium and lithium. The discussion commences with an exploration of the Donnan effect and pore sieving mechanism inherent to NF. The relationship between new monomer structures, including organic framework materials and novel polymer monomers, and pore size regulation is analyzed. The significant potential of innovative monomer designs for pore size control and the critical role of organic framework materials in enhancing water permeability and retention efficiency are highlighted. Furthermore, post-treatment methods, which play a crucial role in improving NF pore properties, are emphasized for their advantages in simplicity, uniformity, and effectiveness in enhancing hydrophilicity, antifouling properties, and precise pore size regulation. This review concludes with a summary and forward-looking on the future pore size regulation techniques for NF, identifying critical challenges such as enhancing rejection performance and augmenting permeate flux. This work aims to provide valuable insights for the application of NF technology in water treatment and lithium resource recovery, thereby advancing the broader discourse on sustainable resource management and technological innovation in the renewable energy industry.
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