Arsenate removal with 3-mercaptopropanoic acid-coated superparamagnetic iron oxide nanoparticles
Morillo Martín, Diego (Universitat Autònoma de Barcelona. Departament de Química)
Faccini, Mirko (LEITAT Technological Center (Barcelona))
Amantia, David. (LEITAT Technological Center (Barcelona))
Valiente Malmagro, Manuel (Universitat Autònoma de Barcelona. Departament de Química)
Pérez González, Gustavo (Universitat Autònoma de Barcelona. Departament de Química)
Aubouy, Laurent (LEITAT Technological Center (Barcelona))

Data:	2015
Resum:	In the present work, superparamagnetic iron oxide nanoparticles (SPION) surface-coated with 3-mercaptopropanoic acid (3-MPA) were prepared and their feasibility for the removal of arsenate from dilute aqueous solutions was demonstrated. The synthesized 3-MPA-coated SPION was characterized using transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and Fourier transform infra-red spectrometry (FTIR). Separation efficiency of the coated nanoparticles and the equilibrium isotherm of arsenate adsorption were investigated. The obtained results reveal the arsenate adsorption to be highly pH-dependent, and the maximum adsorption was attained in less than 60 min. The resulting increase of 3-MPA-coated SPION adsorption capacity to twice the adsorption capacity of SPION alone under the same conditions is attributed to the increase of active adsorption sites. An adsorption reaction is proposed. On the other hand, efficient recovery of arsenate from the loaded nanoparticles was achieved using nitric acid (HNO3) solution, which also provides a concentration over the original arsenate solution.
Ajuts:	Ministerio de Economía y Competitividad CTM2006-13091-C02-02/TECNO European Commission 245843
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Arsenate removal ; Superparamagnetic iron oxide nanoparticles ; SPION ; 3-Mercaptopropionic acid
Publicat a:	Journal of Colloid and Interface Science, Vol. 438 (October 2015) , p. 227, ISSN 0021-9797

DOI: 10.1016/j.jcis.2014.10.005

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