硅酸盐通报2026，Vol.45Issue(2)：675-683,694,10.DOI:10.16552/j.cnki.issn1001-1625.2025.0875
聚乙烯醇改性对二维蒙脱石通道薄膜锂镁分离的影响
Influence of Polyvinyl Alcohol Modification on Lithium-Magnesium Separation of Two-Dimensional Montmorillonite Channel Membrane
摘要
Abstract
Lithium is a key strategic resource to support the new energy revolution,and the total amount of China's salt lake lithium resources holds a dominant position globally.However,Chinese salt lakes commonly suffer from a high magnesium-lithium ratio,which poses a significant challenge for the efficient separation of lithium and magnesium.This study proposed the use of polyvinyl alcohol(PVA)-modified montmorillonite nanosheets.By precisely controlling the gradient amount of PVA,the channel height of montmorillonite nanosheets was regulated,enabling the highly efficient separation of lithium and magnesium.Furthermore,this work elucidated the mechanism by which PVA modulates the channel height of montmorillonite nanosheets.It is found that PVA can be connected to montmorillonite nanosheets through hydrogen bonds,and enters the montmorillonite layers through intercalation,regulating the channel height of two-dimensional montmorillonite membranes,and achieving efficient separation of lithium and magnesium ions.The separation factor of lithium and magnesium in the simulated brine of the modified membrane can reach up to 92.61,which is 20 times higher than that of the unmodified membrane.The modified membrane demonstrates excellent lithium and magnesium separation capability in brine with high salt concentrations and coexisting multiple cations.The magnesium ion rejection rate remains stable at approximately 97%,and the flux is consistently maintained at a level of approximately 30 L·m-2·h-1 after 48 h of long-term stable operation.关键词
蒙脱石/聚乙烯醇/二维纳米片/纳米通道膜/锂镁分离Key words
montmorillonite/polyvinyl alcohol/two-dimensional nanosheet/nanochannel membrane/lithium-magnesium separation分类
航空航天引用本文复制引用
王介瑞,赵云良,王振磊,张婷婷,张鑫,李滢..聚乙烯醇改性对二维蒙脱石通道薄膜锂镁分离的影响[J].硅酸盐通报,2026,45(2):675-683,694,10.基金项目
国家自然科学基金面上项目(52374275) （52374275）
湖北省自然科学基金杰出青年项目(2023AFA084) （2023AFA084）
国家重点研发计划青年科学家项目(2022YFC2906300) （2022YFC2906300）
