材料科学
图层(电子)
多孔性
膜
化学工程
离子键合
逐层
纳米技术
复合材料
离子
有机化学
化学
生物化学
工程类
作者
Yu Zhang,Hao Zhan,Ismail Husein,Zhi Wang,Song Zhao
标识
DOI:10.1002/adfm.202315750
摘要
Abstract Selectively permeable membranes with subnanosized pores show potential for applications in saline wastewater treatment and resource recovery. Here, a novel ionic sieving membrane (ISM) is fabricated via reactive layer‐by‐layer assembly of reduced porous organic cages, providing confined pores for the entry of monovalent ions and the interception of divalent ions. The ion separation performance of ISMs can be tuned by varying the concentration of reduced porous organic cages during the assembly. The highly permeable ISM featuring a surface potential of −52 mV and widely distributed aperture ( µ p = 0.69 nm, σ p = 1.37) preferentially permits the passage of Cl − over SO 4 2− , resulting in remarkable permeance of 9.4 L m −2 h −1 bar −1 and Cl − /SO 4 2− selectivity of 50.3. However, the highly selective ISM with a surface potential of −30 mV and narrowly distributed aperture ( µ p = 0.66 nm, σ p = 1.27) exhibits superior Cl − /SO 4 2− selectivity of 277.3 and Li + /Mg 2+ selectivity of 64.7, indicating that the regular subnanosized pore structure plays a dominant role in achieving precise separation of mono‐/divalent ions. Moreover, owing to the acquired excellent Li + /Mg 2+ selectivity, for the first time, lithium extraction from simulated salt lake brine is achieved by a two‐stage nanofiltration process with reduced Mg 2+ /Li + mass ratio from 40 to 0.3.
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