Selective ion transport in large-area graphene oxide membrane filters driven by the ionic radius and electrostatic interactions.

Autor: Lancellotti L; Institute for Organic Synthesis and Photoreactivity, National Research Council (ISOF-CNR), via Piero Gobetti 101, 40129, Bologna, BO, Italy. palermo@isof.cnr.it., Bianchi A; Institute for Organic Synthesis and Photoreactivity, National Research Council (ISOF-CNR), via Piero Gobetti 101, 40129, Bologna, BO, Italy. palermo@isof.cnr.it., Kovtun A; Institute for Organic Synthesis and Photoreactivity, National Research Council (ISOF-CNR), via Piero Gobetti 101, 40129, Bologna, BO, Italy. palermo@isof.cnr.it., Gazzano M; Institute for Organic Synthesis and Photoreactivity, National Research Council (ISOF-CNR), via Piero Gobetti 101, 40129, Bologna, BO, Italy. palermo@isof.cnr.it., Marforio TD; Department of Chemistry 'G. Ciamician', Alma Mater Studiorum University of Bologna, via Selmi 2, 40126 Bologna, Italy., Xia ZY; Department of Industrial and Materials Science, Chalmers University of Technology, Gothenburg S-41296, Sweden., Calvaresi M; Department of Chemistry 'G. Ciamician', Alma Mater Studiorum University of Bologna, via Selmi 2, 40126 Bologna, Italy., Melucci M; Institute for Organic Synthesis and Photoreactivity, National Research Council (ISOF-CNR), via Piero Gobetti 101, 40129, Bologna, BO, Italy. palermo@isof.cnr.it., Zanardi C; Institute for Organic Synthesis and Photoreactivity, National Research Council (ISOF-CNR), via Piero Gobetti 101, 40129, Bologna, BO, Italy. palermo@isof.cnr.it.; Department of Molecular Sciences and Nanosystems, Ca' Foscari University of Venice, via Torino 155, 30172 Venezia-Mestre, Italy., Palermo V; Institute for Organic Synthesis and Photoreactivity, National Research Council (ISOF-CNR), via Piero Gobetti 101, 40129, Bologna, BO, Italy. palermo@isof.cnr.it.; Department of Molecular Sciences and Nanosystems, Ca' Foscari University of Venice, via Torino 155, 30172 Venezia-Mestre, Italy.
Jazyk: angličtina
Zdroj: Nanoscale [Nanoscale] 2024 Apr 04; Vol. 16 (14), pp. 7123-7133. Date of Electronic Publication: 2024 Apr 04.
DOI: 10.1039/d3nr05874c
Abstrakt: Filters made of graphene oxide (GO) are promising for purification of water and selective sieving of specific ions; while some results indicate the ionic radius as the discriminating factor in the sieving efficiency, the exact mechanism of sieving is still under debate. Furthermore, most of the reported GO filters are planar coatings with a simple geometry and an area much smaller than commercial water filters. Here, we show selective transport of different ions across GO coatings deposited on standard hollow fiber filters with an area >10 times larger than typical filters reported. Thanks to the fabrication procedure, we obtained a uniform coating on such complex geometry with no cracks or holes. Monovalent ions like Na + and K + can be transported through these filters by applying a low electric voltage, while divalent ions are blocked. By combining transport and adsorption measurements with molecular dynamics simulations and spectroscopic characterization, we unravel the ion sieving mechanism and demonstrate that it is mainly due to the interactions of the ions with the carboxylate groups present on the GO surface at neutral pH.
Databáze: MEDLINE
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