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

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 interconne...

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Bibliographic Details
Published in:Carbohydrate polymers 2018-04, Vol.186, p.140-149
Main Authors: Dinu, Maria Valentina, Dinu, Ionel Adrian, Lazar, Maria Marinela, Dragan, Ecaterina Stela
Format: Article
Language:English
Subjects:
Chitosan
Cryo-composites
Ion-imprinting
Selectivity
Unidirectional freezing
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Summary: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.
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2018.01.033