Chitosan-based ion-imprinted cryo-composites with excellent selectivity for copper ions

MV Dinu, IA Dinu, MM Lazar, ES Dragan - Carbohydrate polymers, 2018 - Elsevier
Carbohydrate polymers, 2018Elsevier
An original strategy is proposed here to design chitosan-based ion-imprinted cryo-
composites (II-CCs) with pre-organized recognition sites and tailored porous structure by
combining ion-imprinting and ice-templating techniques. The cryo-composites showed a
tube-like porous morphology with interconnected parallel micro-channels, the distance
between the channel walls being around 15 μm. Both the entrapment of a natural zeolite
and the presence of carboxylate groups, generated by partial hydrolysis of amide moieties …
Abstract
An original strategy is proposed here to design chitosan-based ion-imprinted cryo-composites (II-CCs) with pre-organized recognition sites and tailored porous structure by combining ion-imprinting and ice-templating techniques. The cryo-composites showed a tube-like porous morphology with interconnected parallel micro-channels, the distance between the channel walls being around 15 μm. Both the entrapment of a natural zeolite and the presence of carboxylate groups, generated by partial hydrolysis of amide moieties, led to II-CCs with controlled swelling ratios (25–40 g/g, depending on pH) and enhanced overall chelating efficiency (260 mg Cu2+/g composite). To point out the importance of introducing Cu2+ recognition sites, sorption experiments using mixtures of Cu2+ and other competing ions (Co2+, Ni2+, Zn2+ or/and Pb2+) were also carried out. The higher values of selectivity coefficients obtained for the II-CCs compared to those of non-imprinted ones highlight the remarkable potential of our sorbents for decontamination of wastewaters and recycling of Cu2+ ions.
Elsevier
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