期刊
JOURNAL OF MEMBRANE SCIENCE
卷 591, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.memsci.2019.117345
关键词
Facilitated transport membranes; Graphene-based nanosheets; Crown ethers; Potassium ions; Ion-recognizable copolymers
资金
- National Natural Science Foundation of China [21490582, 21622604]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT15R48]
- Fundamental Research Funds for the Central Universities [2012017yjsy171]
Facilitated transport of K+ ions through membranes is of great significance in both science and technology for the efficient and selective separation of potassium ions. Here, a novel membrane with ion-recognizable copolymers in graphene-based nanochannels is developed for facilitated transport of potassium ions. The poly(N-isopropylacrylamide-co-benzo-15-crown-5-acrylamide) (PNB) copolymers are fixed in the lamellate spacings between the partially reduced graphene oxide (prGO) nanosheets. The K+ permeability of the fabricated prGO-PNB membrane remarkably increases at around the lower critical solution temperature (LCST) of the PNB copolymer, because of the dynamic complexation between B15C5 units and K+ ions at around the LCST. The selectivity of K+/Na+ increases with increasing the content of PNB copolymers in the membrane. The proposed membrane shows good stability in water and K+ separation performance. Due to the uniform channels and facilitated transport mechanism of the prGO-PNB membrane, the comprehensive performance of selectivity and permeability of the K+ ions is better than that of previously reported polymer-based nanofiltration membranes, polymer-based facilitated transport membranes and graphene-based membranes. The proposed strategy of this prGO-PNB membrane that combining graphene-based sheets as skeleton and substance-recognizable copolymers as facilitators is also applicable to fabricate membranes for facilitated transport of other ions or molecules.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据