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Engineering Leaf-Like UiO-66-SO3H Membranes for Selective Transport of Cations

查看全文 作　　者：Tingting [1]Xu;Muhammad Aamir [1]Shehzad;Xin [1]Wang;Bin [2]Wu;Liang [1]Ge;Tongwen [1]Xu 高影响力作者 机构地区：[1]CAS Key Laboratory of Soft Matter Chemistry,iCHEM(Collaborative Innovation Center of Chemistry for Energy Materials),Department of Applied Chemistry,School of Chemistry and Materials Science,University of Science and Technology of China,Hefei 230026,People’s Republic of China;[2]School of Chemistry and Chemical Engineering,Key Laboratory of Environment‑Friendly Polymeric Materials of Anhui Province,Anhui University,Hefei 230601,People’s Republic of China高影响力机构 出　　处：《Nano-Micro Letters》索引2020年第12卷第4期,共11页高影响力期刊 基　　金：funding supported by the National Natural Science Foundation of China(Nos.21490581,91534203,21878282,and 21606215) 摘　　要：Metal–organic frameworks(MOFs)with angstrom-sized pores are promising functional nanomaterials for the fabrication of cation permselective membranes(MOF-CPMs).However,only a few research reports show successful preparation of the MOF-CPMs with good cation separation performance due to several inherent problems in MOFs,such as arduous selfassembly,poor water resistance,and tedious fabrication strategies.Besides,low cation permeation flux due to the absence of the cation permeation assisting functionalities in MOFs is another big issue,which limits their widespread use in membrane technology.Therefore,it is necessary to fabricate functional MOF-CPMs using simplistic strategies to improve cation permeation.In this context,we report a facile in situ smart growth strategy to successfully produce ultrathin(<600 nm)and leaflike UiO-66-SO3H membranes at the surface of anodic alumina oxide.The physicochemical characterizations confirm that sulfonated angstrom-sized ion transport channels exist in the as-prepared UiO-66-SO3H membranes,which accelerate the cation permeation(~3×faster than non-functionalized UiO-66 membrane)and achieve a high ion selectivity(Na^+/Mg^2+>140).The outstanding cation separation performance validates the importance of introducing sulfonic acid groups in MOF-CPMs. 关 键 词：Metal–organic frameworks In situ smart growth UiO-66-SO3H membrane Ion separation
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