English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/185570
Share/Impact:
Statistics
logo share SHARE   Add this article to your Mendeley library MendeleyBASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:
Title

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.
URIhttp://hdl.handle.net/10261/185570
Appears in Collections:(ICMM) Comunicaciones congresos
Files in This Item:
File Description SizeFormat 
accesoRestringido.pdf15,38 kBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.