Publicación:
Adsorption of arsenite and arsenate on binary and ternary magnetic nanocomposites with high iron oxide content
Adsorption of arsenite and arsenate on binary and ternary magnetic nanocomposites with high iron oxide content
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Fecha
2018
Autores
Ramos Guivar J.A.
Bustamante D. A.
Gonzalez J.C.
Sanches E.A.
Morales M.A.
Raez J.M.
López-Muñoz M.-J.
Arencibia A.
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Elsevier
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Abstracto
Bare maghemite nanoparticles (Nps), binary, and ternary magnetic nanocomposites made with
titanium dioxide (TiO2) and graphene oxide (GO) were synthesized by a facile and cheap coprecipitation 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 N2 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, with these nanocomposites having a high percentage of
maghemite phase (80%). The presence of TiO2 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 m2
/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, and can be fast
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.
Descripción
Palabras clave
Titanium oxides,
Adsorption,
Fourier transform infrared spectroscopy,
Graphene,
Nanocomposites,
Nanoparticles,
Permanent magnets,
Precipitation (chemical),
Titanium dioxide,
Titanium dioxide,
Adsorption capacities