Potential use of CeO₂, TiO₂ and Fe₃O₄ nanoparticles for the removal of cadmium from water
Contreras Rodríguez, Ada Rebeca (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)
García, Ana (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)
González, Edgar E. (Institut Català de Nanociència i Nanotecnologia)
Casals, Eudald (Institut Català de Nanociència i Nanotecnologia)
Puntes, Víctor (Institut Català de Nanociència i Nanotecnologia)
Sanchez, Antoni (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)
Font i Segura, Xavier (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)
Recillas, Sonia (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)

Date:	2012
Abstract:	Inorganic nanoparticles (NPs) of cerium oxide (CeO₂), iron oxide (Fe₃O₄) and titanium oxide (TiO₂) were studied for the removal of dissolved cadmium from water at concentrations ranging from 25 to 350 mg/L. Adsorption was the predominant mechanism for sequestration, and particularly efficient cadmium removal was demonstrated for Fe₃O₄ NPs. Experimental data were fitted to three different adsorption isotherms: Langmuir, Freundlich and Temkin. The best fit was obtained for the Freundlich isotherm (R² > 0. 96 for all NPs). Adsorption was shown to follow pseudo second-order kinetics (R² ⩾ 0. 91 for all NPs). All three NPs showed some removal of cadmium in aqueous solution, but after 72 h of process, Fe₃O₄ NPs showed a higher capacity of cadmium adsorption (101. 1 mg Cd/g NP) than CeO₂ NPs (49. 1 mg Cd/g NP) or TiO₂ NPs (12. 2 mg Cd/g NP). These results demonstrate the potential use of this NPs to remove dissolved cadmium at high concentrations.
Note:	Financial support was provided by the Spanish Ministerio de Medio Ambiente y Medio Rural y Marino (Project Exp. 007/RN08/03.1). Sonia Recillas thanks Universitat Autònoma de Barcelona for the award of a post-doctoral fellowship.
Note:	Altres ajuts: MAPAMA/007/RN08/03.1
Rights:	Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets.
Language:	Anglès
Document:	Article ; recerca ; Versió sotmesa a revisió
Subject:	Cadmium ; Adsorption ; Nanoparticles ; Water treatment ; Adsorption kinetics ; Adsorption isotherm
Published in:	Desalination and water treatment, Vol. 41, Issue 1-3 (2012) , p. 296-300, ISSN 1944-3994

DOI: 10.1080/19443994.2012.664743

Pre-print 17 p, 496.4 KB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Engineering > Composting Research Group (GICOM)
Articles > Research articles
Articles > Published articles