Adsorption of arsenite and arsenate on binary and ternary magnetic nanocomposites with high iron oxide content

Juan A. Ramos Guivar, Angel Bustamante D., J. C. Gonzalez, Edgar A. Sanches, M. A. Morales, Julia M. Raez, María José López-Muñoz, Amaya Arencibia

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

26 Citas (Scopus)

Resumen

Bare maghemite nanoparticles (Nps), binary, and ternary magnetic nanocomposites prepared with titanium dioxide (TiO 2 ) and graphene oxide (GO) were synthesized by a facile and cheap co-precipitation chemical route, and used as magnetic nanoadsorbents to remove arsenite (As(III)) and arsenate (As(V)) from water. The structural, morphological, magnetic and surface properties were analyzed by XRD, TEM microscopy, FTIR and Raman vibrational spectroscopy, Mössbauer technique and N 2 adsorption-desorption measurements. It was found that materials were composed of maghemite nanoparticles with crystallites diameters varying from 9 to 13 nm for bare Nps, binary and ternary nanocomposites, these nanocomposites contain a high percentage of maghemite phase (80%). The presence of TiO 2 and GO in the binary and ternary materials was also confirmed. All the samples were found to show magnetic properties and a slight porosity, with a specific surface area that increases up to 82 m 2 /g when the metal oxides Nps were supported on GO. The aqueous arsenic adsorption performance was studied from kinetic and equilibrium point of view, and the pH adsorption capacity dependence was evaluated aiming to explain the adsorption mechanism. The three nanocomposites prepared in this work exhibit high adsorption capacity for arsenic species, with values of maximum adsorption capacity ranging from 83.1 to 110.4 mg/g for As(III) and from 90.2 to 127.2 mg/g for As(V) from bare to ternary nanocomposites, being possible to be separated with a permanent magnet of neodymium (Nd) in less than 10 min. Therefore, these nanosystems can be proposed as good adsorbents for both arsenic species from water.

Idioma originalInglés
Páginas (desde-hasta)87-100
Número de páginas14
PublicaciónApplied Surface Science
Volumen454
DOI
EstadoPublicada - 1 oct 2018

Nota bibliográfica

Publisher Copyright:
© 2018 Elsevier B.V.

Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.

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