Nitrogen-doped nanoporous graphene induced by a multiple confinement strategy for membrane separation of rare earth
| Autor: | Jia Chen, Hongdeng Qiu, Qing Liang, Xin Zhang, Hongxin Tan, Juewen Liu, Shiwei Cao, Zhan Li, Yanli Yuan, Jinsheng Wu |
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| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Materials science Oxide 02 engineering and technology Nanoreactor Article Porous Material law.invention 03 medical and health sciences chemistry.chemical_compound law lcsh:Science Multidisciplinary Hydrotalcite Nanoporous Graphene Doping Chemical Synthesis 021001 nanoscience & nanotechnology Nanopore 030104 developmental biology Membrane Chemical engineering chemistry Separation Science lcsh:Q 0210 nano-technology |
| Zdroj: | iScience, Vol 24, Iss 1, Pp 101920-(2021) iScience |
| ISSN: | 2589-0042 |
| Popis: | Summary Rare 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)2 is 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 Abstract Highlights • 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 media Separation Science; Chemical Synthesis; Porous Material |
| Databáze: | OpenAIRE |
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