Selective ion transport in large-area graphene oxide membrane filters driven by the ionic radius and electrostatic interactions
Lidia Lancellotti, Antonio Bianchi, Alessandro Kovtun, Massimo Gazzano, Tainah Dorina Marforio, Zhenyuan Xia, Matteo Calvaresi, Manuela Melucci, Chiara Zanardi, Vincenzo Palermo
Abstract
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.
Topics & Concepts
GrapheneIonic radiusRADIUSMembraneIonic bondingOxideIonChemical physicsMaterials scienceNanotechnologyIon transporterIonic potentialChemical engineeringChemistryComputer scienceOrganic chemistryEngineeringComputer securityBiochemistryMetallurgyGraphene research and applicationsNanopore and Nanochannel Transport StudiesMembrane Separation Technologies