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Molecules 2016, 21(1), 109;

Sorption of Cu(II) Ions on Chitosan-Zeolite X Composites: Impact of Gelling and Drying Conditions

Institut Charles Gerhardt, UMR 5253 CNRS/UM2/ENSCM/UM1, Matériaux Avancés pour la Catalyse et la Santé, ENSCM, 8 rue Ecole Normale, 34296 Montpellier Cedex 5, France
Laboratoire de Chimie Des Matériaux, Département de Chimie, Faculté des Sciences Exactes et Appliquées, Université Oran 1-Ahmed Benbella, B.P. 1524 Elmenaouar, Oran 31000, Algeria
Faculté de Chimie, Université des Sciences et de la Technologie d’Oran-Mohamed Boudiaf, USTO, B.P. 1505 Elmenaouar, Oran 31000, Algeria
Author to whom correspondence should be addressed.
Academic Editor: Massimiliano Fenice
Received: 30 November 2015 / Revised: 6 January 2016 / Accepted: 13 January 2016 / Published: 19 January 2016
(This article belongs to the Special Issue Chitin, Chitosan and Related Enzymes)
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Chitosan-zeolite Na-X composite beads with open porosity and different zeolite contents were prepared by an encapsulation method. Preparation conditions had to be optimised in order to stabilize the zeolite network during the polysaccharide gelling process. Composites and pure reference components were characterized using X-ray diffraction (XRD); scanning electron microscopy (SEM); N2 adsorption–desorption; and thermogravimetric analysis (TG). Cu(II) sorption was investigated at pH 6. The choice of drying method used for the storage of the adsorbent severely affects the textural properties of the composite and the copper sorption effectiveness. The copper sorption capacity of chitosan hydrogel is about 190 mg·g−1. More than 70% of this capacity is retained when the polysaccharide is stored as an aerogel after supercrititcal CO2 drying, but nearly 90% of the capacity is lost after evaporative drying to a xerogel. Textural data and Cu(II) sorption data indicate that the properties of the zeolite-polysaccharide composites are not just the sum of the properties of the individual components. Whereas a chitosan coating impairs the accessibility of the microporosity of the zeolite; the presence of the zeolite improves the stability of the dispersion of chitosan upon supercritical drying and increases the affinity of the composites for Cu(II) cations. Chitosan-zeolite aerogels present Cu(II) sorption properties. View Full-Text
Keywords: biomass; chitosan; zeolite X; composites; aerogel; metal sorption biomass; chitosan; zeolite X; composites; aerogel; metal sorption

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Djelad, A.; Morsli, A.; Robitzer, M.; Bengueddach, A.; di Renzo, F.; Quignard, F. Sorption of Cu(II) Ions on Chitosan-Zeolite X Composites: Impact of Gelling and Drying Conditions. Molecules 2016, 21, 109.

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