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Reference type: Journal
Authors: Zhang M, Helleur R, Zhang Y
Article Title: Ion-imprinted chitosan gel beads for selective adsorption of Ag+ from aqueous solutions.
Publication date: 2015
Journal: Carbohydrate Polymers
Volume: 130
Page numbers: 206-212.
DOI: 10.1016/j.carbpol.2015.05.038
Alternative URL: http://www.sciencedirect.com/science/article/pii/S0144861715004440

Abstract: In this study, the Ag+-imprinted chitosan gel beads were synthesized to selectively adsorb Ag+ from bimetallic aqueous solutions containing the same molar concentration of Ag+ and Cu2+. The Ag+-imprinting not only helps to achieve extremely high selectivity of Ag+, but also enhances the uptake capacity of the target Ag+ by protecting some amine groups, the primary binding sites of metal ions from cross-linking. The maximum uptake of Ag+ by the ion-imprinted chitosan beads was found to be 89.20 mg g-1 at 25.0 C with an initial Ag+ concentration of 352.95 mg L-1 and the biosorbent dosage of 1.0 g L-1. The adsorption equilibrium and kinetics of Ag+ by the ion-imprinted chitosan beads can be better described by Langmuir isotherm and the intraparticle diffusion model. FTIR and XPS analyses suggested that amine functional groups involve the binding of Ag+ via complexation at higher solution pH (3.0 pH 5.0) and ion exchange at lower solution pH (1.0 pH < 3.0)
Template and target information: silver ion, Ag(I)
Author keywords: chitosan, cross-linking, Ion-imprinting, Silver, selective adsorption

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