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Authors: Zhang M, Zhang Y, Helleur R
Article Title: Selective adsorption of Ag+ by ion-imprinted O-carboxymethyl chitosan beads grafted with thiourea-glutaraldehyde.
Publication date: 2015
Journal: Chemical Engineering Journal
Volume: 264
Page numbers: 56-65.
DOI: 10.1016/j.cej.2014.11.062
Alternative URL: http://www.sciencedirect.com/science/article/pii/S1385894714015216
Abstract: In this study, a novel technique combining surface imprinting and polymer crosslinking was applied to synthesize the Ag+-imprinted thiourea/glutaraldehyde grafted O-carboxymethyl chitosan (ITG-OCMC) beads which demonstrate extremely good selective adsorption of Ag+ from a bimetallic aqueous solution. Results indicated that high degree of carboxymethylation and low level of crosslinking would help to achieve higher uptake capacity of Ag+. The maximum uptake of Ag+ was found to be 156.32 mg g-1 at 40 -ŚC with an initial Ag+ concentration of 160.5 mg L-1 and the biosorbent dosage of 1.0 g L-1. Langmuir isotherm and Lagergren's pseudo-second-order kinetic can be used to describe the sorption process of Ag+. Analyses from FT-IR and XPS confirmed that selective adsorption of Ag+ took place on the surfaces of ITG-OCMC beads by chelation through >C=S, amine, carboxyl and hydroxyl groups
Template and target information: silver ion, Ag(I)
Author keywords: Carboxymethyl chitosan, crosslinking, imprinting, Schiff base, Silver, selective adsorption
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