膜
剥脱关节
化学工程
镁
材料科学
氢氧化物
单层
膜技术
离子
纳米技术
化学
石墨烯
有机化学
生物化学
工程类
冶金
作者
Biao Li,Juanjuan Peng,Menghan Li,Zeya Yang,Jun Lu,Jingbin Han
摘要
Abstract Two‐dimensional (2D) membranes have demonstrated potential for molecular separation; however, their applicability for Li/Mg ion separation has been restricted by their negatively‐charged and easily‐swellable properties in water. Moreover, their practical application has been hindered by the challenge of producing significant quantities of single‐layer nanosheets. To overcome these challenges, we have developed a scalable method for synthesizing micro‐sized nitrate ZnAl layered double hydroxide (LDH) and subsequent exfoliating to yield monolayer nanosheets for the construction of 2D membranes. The sub‐nanometer channels of the LDH membrane is positively charged, which prevents the passage of magnesium ions. These channels also impede the flow of magnesium ions that are more difficult to dehydrate. As a result, the LDH membranes exhibit robust lithium–magnesium separation ability, with a separation ratio of 6 (Li/Mg). This work provides a method for producing high‐quality LDH nanosheets and validates the enormous potential of LDH membranes in the field of lithium–magnesium separation.
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