文章基本信息

标题：Nitrogen-doped nanoporous graphene induced by a multiple confinement strategy for membrane separation of rare earth
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作者：Hongxin Tan ; Xin Zhang ; Zhan Li 等
期刊名称：iScience
印刷版ISSN：2589-0042
出版年度：2021
卷号：24
期号：1
页码：1-36
DOI：10.1016/j.isci.2020.101920
语种：English
出版社：Elsevier
摘要：SummaryRare earth separation is still a major challenge in membrane science. Nitrogen-doped nanoporous graphene (NDNG) is a promising material for membrane separation, but it has not yet been tested for rare earth separation, and it is limited by multi-complex synthesis. Herein, we developed a one-step, facile, and scalable approach to synthesize NDNG with tunable pore size and controlled nitrogen content using confinement combustion. Nanoporous hydrotalcite from Zn(NO3)2is formed between layers of graphene oxide (GO) absorbed with phenylalanine via confinement growth, thus preparing the sandwich hydrotalcite/phenylalanine/GO composites. Subsequently, area-confinement combustion of hydrotalcite nanopores is used to etch graphene nanopores, and the hydrotalcite interlayer as a closed flat nanoreactor induces two-dimensional space confinement doping of planar nitrogen into graphene. The membrane prepared by NDNG achieves separation of Sc3+from the other rare earth ions with excellent selectivity (∼3.7) through selective electrostatic interactions of pyrrolic-N, and separation selectivity of ∼1.7 for Tm3+/Sm3+.Graphical AbstractDisplay OmittedHighlights•A multiple confinement strategy is constructed to achieve the synthesis of NDNG•Planar nitrogen-doped NDNG with tunable pore size is obtained by one-step synthesis•NDNG membrane presents excellent selectivity for rare earth in strong acidic mediaSeparation Science; Chemical Synthesis; Porous Material