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Chitosan-vermiculite bionanocomposite foams as biosorbents for the removal of cadmium(II) ions

AuthorsPadilla-Ortega, Érika; Darder, Margarita ; Aranda, Pilar ; Leyva-Ramos, R.; Ruiz-Hitzky, Eduardo
Issue Date2015
CitationEuroclay 2015
AbstractBionanocomposites have emerged in the last decade as nanostructured hybrid materials with new structural and functional properties through the combination of natural polymers (biopolymers) and inorganic solids, with at least one dimension at the nanometer scale (1). These new ecofriendly materials are being addressed to a wide range of applications including food packaging, biomedical purposes or environmental remediation (2). Chitosan, prepared by basic deacetylation of chitin, has been extensively used in the synthesis of bionanocomposites due to its great abundancy and interesting properties. Smectites and fibrous clays, such as sepiolite, have been combined with this polysaccharide to produce bionanocomposites for various applications (3-5), but analogous materials based on vermiculite have been less explored, probably due to the difficulty of polymers to penetrate the interlayer space of this clay. The aim of this work was to optimize the preparation of bionanocomposites based on chitosan and vermiculite from Louisiana (USA), pristine or modified with hexadecyltrimethylammonium cations, using ultrasound irradiation, followed by the processing of the resulting materials as low density macroporous foams by means of freeze-drying. Physicochemical characterization by means of elemental analysis, X-ray diffraction, infrared spectroscopy, thermal analysis and scanning and transmission electron microscopy confirmed the intercalation of chitosan into the interlayer space of vermiculite, reaching the exfoliation of the clay layers under certain conditions. These bionanocomposite foams were applied in the removal of Cd(II) from aqueous solutions. The adsorption data were evaluated with the Langmuir, Freundlich and Prausnitz-Radke (P-R) isotherm models, and the P-R isotherm best fitted the experimental data. The adsorption capacity of these bionanocomposites was proven to be remarkably high, and at least three times higher than pristine vermiculite and chitosan applied separately.
DescriptionOral presentation given at the Euroclay 2015, held in Edinburgh (Scotland), on July 5-10th, 2015.
Appears in Collections:(ICMM) Comunicaciones congresos
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