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Insight into Ion Transport in Discrete Frameworks of Porous Organic Cage Membranes
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2022-12-29 , DOI: 10.1021/acs.iecr.2c04160 Tingting Xu 1 , Bin Wu 2 , Yifan Li 1 , Yanran Zhu 1 , Fangmeng Sheng 1 , Liang Ge 1 , Xingya Li 1 , Tongwen Xu 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2022-12-29 , DOI: 10.1021/acs.iecr.2c04160 Tingting Xu 1 , Bin Wu 2 , Yifan Li 1 , Yanran Zhu 1 , Fangmeng Sheng 1 , Liang Ge 1 , Xingya Li 1 , Tongwen Xu 1
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Porous organic cages (POCs) of discrete frameworks are promising candidates for separation membranes of high ion permeability and selectivity. Here, we investigate the ion transport properties of POC (i.e., CC1, CC3, and CC19) membranes with different cage arrangements, channel wettabilities, and surface charges. Compared to CC1, the window-to-window alignment of CC3 membranes leads to continuous channels with the window-cavity structure and guarantees a high ion permeability and ion selectivity. In comparison with CC19, the hydrophobic channels of CC3 membranes suppress the hydrogen-bonding interaction between hydrated ions and the channel wall, facilitating fast ion transport. Tuning the surface charge of CC3 membranes from the negative to positive state, the mono-/divalent cation selectivity increases obviously due to the enhanced electrostatic repulsion toward divalent cations. This work reveals ion transport behaviors in POCs with various channel configurations and surface chemistries, offering guidelines for the construction of efficient ion separation membranes.
中文翻译：
洞察多孔有机笼膜离散框架中的离子传输
离散框架的多孔有机笼 (POC) 是具有高离子渗透性和选择性的分离膜的有前途的候选者。在这里，我们研究了具有不同笼排列、通道润湿性和表面电荷的 POC（即 CC1、CC3 和 CC19）膜的离子传输特性。与 CC1 相比，CC3 膜的窗对窗排列导致具有窗腔结构的连续通道，并保证了高离子渗透性和离子选择性。与 CC19 相比，CC3 膜的疏水通道抑制了水合离子与通道壁之间的氢键相互作用，促进了快速离子传输。将 CC3 膜的表面电荷从负状态调整为正状态，由于对二价阳离子的静电排斥增强，一价/二价阳离子选择性明显增加。这项工作揭示了具有各种通道配置和表面化学性质的 POC 中的离子传输行为，为构建高效离子分离膜提供了指导。
更新日期：2022-12-29
中文翻译：
洞察多孔有机笼膜离散框架中的离子传输
离散框架的多孔有机笼 (POC) 是具有高离子渗透性和选择性的分离膜的有前途的候选者。在这里，我们研究了具有不同笼排列、通道润湿性和表面电荷的 POC（即 CC1、CC3 和 CC19）膜的离子传输特性。与 CC1 相比，CC3 膜的窗对窗排列导致具有窗腔结构的连续通道，并保证了高离子渗透性和离子选择性。与 CC19 相比，CC3 膜的疏水通道抑制了水合离子与通道壁之间的氢键相互作用，促进了快速离子传输。将 CC3 膜的表面电荷从负状态调整为正状态，由于对二价阳离子的静电排斥增强，一价/二价阳离子选择性明显增加。这项工作揭示了具有各种通道配置和表面化学性质的 POC 中的离子传输行为，为构建高效离子分离膜提供了指导。
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