Chromium VI adsorption on cerium oxide nanoparticles and morphology changes during the process
Recillas, Sonia (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)
Colón Jordà, Joan (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)
Casals, Eudald (Institut Català de Nanociència i Nanotecnologia)
González, Edgar E. (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)

Date:	2010
Abstract:	In this study, suspended cerium oxide nanoparticles stabilized with hexamethylenetetramine were used for the removal of dissolved chromium VI in pure water. Several concentrations of adsorbent and adsorbate were tested, trying to cover a large range of possible real conditions. Results showed that the Freundlich isotherm represented well the adsorption equilibrium reached between nanoparticles and chromium, whereas adsorption kinetics could be modeled by a pseudo-second-order expression. The separation of chromium-cerium nanoparticles from the medium and the desorption of chromium using sodium hydroxide without cerium losses was obtained. Nanoparticles agglomeration and morphological changes during the adsorption-desorption process were observed by TEM. Another remarkable result obtained in this study is the low toxicity in the water treated by nanoparticles measured by the Microtox® commercial method. These results can be used to propose this treatment sequence for a clean and simple removal of drinking water or wastewater re-use when a high toxicity heavy metal such as chromium VI is the responsible for water pollution.
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 and Joan Colón thank Universitat Autònoma de Barcelona for the award of a post-doctoral and pre-doctoral fellowship respectively..
Note:	Altres ajuts: MAPAMA/007/RN08/03.1
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió sotmesa a revisió
Subject:	CeO₂ nanoparticles ; Adsorption ; Desorption ; Kinetics ; Chromium VI ; Toxicity
Published in:	Journal of hazardous materials, Vol. 184, Issues 1-3 (Dec. 2010) , p. 425-431, ISSN 1873-3336

DOI: 10.1016/j.jhazmat.2010.08.052

Pre-print 31 p, 932.6 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