TY - JOUR
T1 - Freestanding two-dimensional nanofluidic membranes modulated by zwitterionic polyelectrolyte for mono-/di-valent ions selectivity transport
AU - Dai, Liheng
AU - Pang, Sichen
AU - Li, Shiyi
AU - Yi, Zhiyuan
AU - Qu, Kai
AU - Wang, Yixing
AU - Wu, Yulin
AU - Li, Siyao
AU - Lei, Linfeng
AU - Huang, Kang
AU - Guo, Xuhong
AU - Xu, Zhi
N1 - Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/7/5
Y1 - 2023/7/5
N2 - Effective separation of mono-/di-valent metal ions based on membrane technology is highly desirable in the energy storage and environmental protection field, but requires membranes capable of selective recognition of ions with similar nano-scale size. In this work, we designed and synthesized the sulfonate polyethylenimine (PEI-SO3H), as a zwitterionic polyelectrolyte, and integrated it into two-dimensional (2D) graphene oxide (GO) confined channels. Stable and sub-nanometer ion-selective transport channels enable fast transport of monovalent metal ions with high mono-/di-valent ion selectivity for K+/Mg2+ (12.2), Na+/Mg2+ (11.4) and Li+/Mg2+ (10.1) under electric field. Notably, the hydration compensation-promoting diffusion (HCPD) mechanism based on the synergistic effect of amino groups as compensation sites and sulfonic acid groups as recognition sites was proposed to understand the high-efficiency ion-selective transport process. In addition, instructed by abovementioned theory, the 2D vermiculite membrane was also designed to well realize the mono-/di-valent ions separation. This study provides a new strategy to construct freestanding 2D membranes with efficient ion-selective transport channels instructed by HCPD theory, which is expected to expand the potential for using membranes in the lithium extraction.
AB - Effective separation of mono-/di-valent metal ions based on membrane technology is highly desirable in the energy storage and environmental protection field, but requires membranes capable of selective recognition of ions with similar nano-scale size. In this work, we designed and synthesized the sulfonate polyethylenimine (PEI-SO3H), as a zwitterionic polyelectrolyte, and integrated it into two-dimensional (2D) graphene oxide (GO) confined channels. Stable and sub-nanometer ion-selective transport channels enable fast transport of monovalent metal ions with high mono-/di-valent ion selectivity for K+/Mg2+ (12.2), Na+/Mg2+ (11.4) and Li+/Mg2+ (10.1) under electric field. Notably, the hydration compensation-promoting diffusion (HCPD) mechanism based on the synergistic effect of amino groups as compensation sites and sulfonic acid groups as recognition sites was proposed to understand the high-efficiency ion-selective transport process. In addition, instructed by abovementioned theory, the 2D vermiculite membrane was also designed to well realize the mono-/di-valent ions separation. This study provides a new strategy to construct freestanding 2D membranes with efficient ion-selective transport channels instructed by HCPD theory, which is expected to expand the potential for using membranes in the lithium extraction.
KW - Confined mass transfer
KW - Graphene oxide
KW - Ion-selective transport
KW - Monovalent/divalent ions separation
KW - Two-dimensional membrane
UR - http://www.scopus.com/inward/record.url?scp=85152670164&partnerID=8YFLogxK
U2 - 10.1016/j.memsci.2023.121621
DO - 10.1016/j.memsci.2023.121621
M3 - 文章
AN - SCOPUS:85152670164
SN - 0376-7388
VL - 677
JO - Journal of Membrane Science
JF - Journal of Membrane Science
M1 - 121621
ER -