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Magnetic, structural and surface properties of functionalized maghemite nanoparticles for copper and lead adsorption
Magnetic, structural and surface properties of functionalized maghemite nanoparticles for copper and lead adsorption
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Fecha
2017
Autores
Guivar, JAR
Sadrollahi, E
Menzel, D
Fernandes, EGR
Loez, EO
Torres, MM
Arsuaga, JM
Arencibia, A
Litterst, FJ
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Royal Society of Chemistry
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Abstracto
In this study, magnetic nanocomposites were developed and used as adsorbents for lead and copper from
aqueous media. Structural, surface, magnetic and textural properties of functionalized maghemite
nanoparticles synthesized by alkaline co-precipitation were studied. The surfaces of the iron oxide
nanoparticles (Nps) were modified with different chemical agents such as fatty and amino acids, silica
(SiO2), mesoporous silica (SBA-15), hydroxyapatite, multiwall carbon nanotubes (MWCNTs) and
ethylenediaminetetraacetic acid (EDTA), obtaining NPs with mean particle sizes ranging from 7 to 16 nm
according to Rietveld refinement and TEM images analysis. The physicochemical surface properties of
the functionalized materials were studied via zeta potential (z) and Fourier transform infrared (FTIR)
spectroscopy. Mossbauer spectroscopy (MS) as a function of temperature and DC magnetometry were ¨
used to study the magnetic properties. The superparamagnetic relaxation was studied by MS. The
resolved spectra at 20 K confirm the presence of nanomaghemite phase. Besides, the saturation
magnetization varies from 12 to 62 emu g 1
. A nitrogen adsorption–desorption technique was used to
determine the specific surface area and to study the porous structure. The functionalized g-Fe2O3 Nps
exhibited a Brunauer–Emmett–Teller (BET) specific surface area ranging from 74 to 214 m2 g 1 and
revealed remarkable uptake capacities to remove Cu(II) and Pb(II) species from aqueous solutions
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Palabras clave
Adsorption,
Alkalinity,
Carbon