Research Progress on the Mechanism and Influencing Factors of Lithium and Magnesium Separation by Nanofiltration Membrane
Lithium,as an essential energy metal in the 21st century,is widely used in the fields of novel energy and batteries.However,it is unevenly distributed in environments such as salt lakes,presenting a technical challenge for the efficient separa-tion of lithium and magnesium.The paper focuses on the key factors influencing the separation of lithium and magnesium by nanofiltration membrane.Firstly,membrane surface morphology,pore size,and pore size distribution directly affecting the separation efficiency of lithium and magnesium were discussed.Secondly,the moderate adjustments in roughness and mem-brane thickness have been proven to significantly improve water permeability,but this also introduces the issue of membrane fouling.Thirdly,the importance of positive charges in nanofiltration membranes and adjustments of cross-linking degree to enhance magnesium rejection effects were also revealed.Moreover,it has been proven that the introduction of hydrophilic and functional groups can improve water flux and further optimize the separation effect.Therefore,to advance lithium recovery nanofiltration technology,it is vital to develop new membrane materials,uncover interfacial polymerization reaction mecha-nisms,and enhance anti-fouling performance.
separation of lithium and magnesiumnanofiltration membraneinterfacial polymerizationselectivitypermea-bility
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