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Artículo

Synthesis and characterization of Fe(III)-montmorillonites for phosphate adsorption

Borgnino Bianchi, Laura CarolinaIcon ; Avena, Marcelo JavierIcon ; de Pauli, Carlos PrimoIcon
Fecha de publicación: 28/06/2009
Editorial: Elsevier Science
Revista: Colloids and Surfaces A: Physicochemical and Engineering Aspects
ISSN: 0927-7757
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Meteorología y Ciencias Atmosféricas

Resumen

Two Fe(III)-modified montmorillonites were synthesized by mixing Fe(III) nitrate solutions with montmorillonite at pH 3.5 followed by an increase in pH up to 9. The synthesis procedure was analyzed by solubility calculations and Fe(III) speciation in aqueous solutions, and the resulting solids were characterized by X-ray diffraction, specific surface area, Mössbauer spectroscopy, electrophoretic mobilities (EM) and phosphate adsorption. At low pH, iron concentration in solution during the synthesis is controlled by adsorption/intercalation reactions, whereas at high pH the concentration is controlled by the solubility of ferrihydrite. When the initial Fe(III) content is relatively low the synthesized solid contains mainly interlayer/sorbed Fe(III). When the initial Fe(III) content is relatively high the synthesized solid contains also some iron (hydr)oxide phases, mainly ferrihydrite. These Fe(III) phases are in close contact with montmorillonite, either coating the montmorillonite surface or aggregated with montmorillonite particles. The presence of Fe(III) species increases significantly the specific surface area and phosphate adsorption capacity, but changes only slightly the EM of the solid.
Palabras clave: Fe (Hydr)Oxide Coating , Fe(Iii)-Montmorillonite , Ferrihydrite , Phosphate Adsorption
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/59237
URL: https://www.sciencedirect.com/science/article/pii/S0927775709001654
DOI: http://dx.doi.org/10.1016/j.colsurfa.2009.03.037
Colecciones
Articulos(CICTERRA)
Articulos de CENTRO DE INVEST.EN CS.DE LA TIERRA
Articulos(INFIQC)
Articulos de INST.DE INVESTIGACIONES EN FISICO- QUIMICA DE CORDOBA
Articulos(INQUISUR)
Articulos de INST.DE QUIMICA DEL SUR
Citación
Borgnino Bianchi, Laura Carolina; Avena, Marcelo Javier; de Pauli, Carlos Primo; Synthesis and characterization of Fe(III)-montmorillonites for phosphate adsorption; Elsevier Science; Colloids and Surfaces A: Physicochemical and Engineering Aspects; 341; 1-3; 28-6-2009; 46-52
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