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

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 w...

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Bibliographic Details
Published in:Molecules (Basel, Switzerland) Switzerland), 2016-01, Vol.21 (1), p.E109-E109
Main Authors: Djelad, Amal, Morsli, Amine, Robitzer, Mike, Bengueddach, Abdelkader, di Renzo, Francesco, Quignard, Françoise
Format: Article
Language:English
Subjects:
Adsorption
aerogel
biomass
Cations, Divalent - chemistry
Chemical Sciences
chitosan
Chitosan - chemistry
composites
Copper - chemistry
Gels
Material chemistry
metal sorption
Nanocomposites - chemistry
Nanocomposites - ultrastructure
X-Ray Diffraction
zeolite X
Zeolites - chemistry
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Summary: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.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules21010109