TY - JOUR
T1 - Highly ion-permselective porous organic cage membranes with hierarchical channels
AU - Xu, Tingting
AU - Wu, Bin
AU - Hou, Linxiao
AU - Zhu, Yanran
AU - Sheng, Fangmeng
AU - Zhao, Zhang
AU - Dong, Yun
AU - Liu, Jiandang
AU - Ye, Bangjiao
AU - Li, Xingya
AU - Ge, Liang
AU - Wang, Huanting
AU - Xu, Tongwen
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (grant nos. 21878282, U20A20127, 52021002, and 22108267), the National Key R & D Program of China (2020YFB1505601), the Key Technologies R & D Program of Anhui Province (grant no. 202104b11020030), the Fundamental Research Funds for the Central Universities (grant No. WK2060000030), the Natural Science Foundation of Anhui Province (grant no. 2108085MB33), USTC Research Funds of the Double First-Class Initiative (YD2060002022), and the support of the Synchrotron Radiation Joint Funds of the University of Science and Technology of China (grant Nos. NSRLLHJJ2016 and UN2018LHJJ).
Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.
PY - 2022/6/15
Y1 - 2022/6/15
N2 - Membranes of high ion permselectivity are significant for the separation of ion species at the subnanometer scale. Here, we report porous organic cage (i.e., CC3) membranes with hierarchical channels including discrete internal cavities and cage-aligned external cavities connected by subnanometer-sized windows. The windows of CC3 sieve monovalent ions from divalent ones and the dual nanometer-sized cavities provide pathways for fast ion transport with a flux of 1.0 mol m-2h-1and a mono-/divalent ion selectivity (e.g., K+/Mg2+) up to 103, several orders of magnitude higher than the permselectivities of reported membranes. Molecular dynamics simulations illustrate the ion transport trajectory from the external to internal cavity via the CC3 window, where ions migrate in diverse hydration states following the energy barrier sequence of K+< Na+< Li+≥ Mg2+. This work sheds light on ion transport properties in porous organic cage channels of discrete frameworks and offers guidelines for developing membranes with hierarchical channels for efficient ion separation.
AB - Membranes of high ion permselectivity are significant for the separation of ion species at the subnanometer scale. Here, we report porous organic cage (i.e., CC3) membranes with hierarchical channels including discrete internal cavities and cage-aligned external cavities connected by subnanometer-sized windows. The windows of CC3 sieve monovalent ions from divalent ones and the dual nanometer-sized cavities provide pathways for fast ion transport with a flux of 1.0 mol m-2h-1and a mono-/divalent ion selectivity (e.g., K+/Mg2+) up to 103, several orders of magnitude higher than the permselectivities of reported membranes. Molecular dynamics simulations illustrate the ion transport trajectory from the external to internal cavity via the CC3 window, where ions migrate in diverse hydration states following the energy barrier sequence of K+< Na+< Li+≥ Mg2+. This work sheds light on ion transport properties in porous organic cage channels of discrete frameworks and offers guidelines for developing membranes with hierarchical channels for efficient ion separation.
UR - http://www.scopus.com/inward/record.url?scp=85131747990&partnerID=8YFLogxK
U2 - 10.1021/jacs.2c00318
DO - 10.1021/jacs.2c00318
M3 - Article
C2 - 35586909
AN - SCOPUS:85131747990
VL - 144
SP - 10220
EP - 10229
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
SN - 0002-7863
IS - 23
ER -