Removal of mercury(II) from contaminated water by gold-functionalised Fe3O4 magnetic nanoparticles.
Environ Technol
; 41(8): 959-970, 2020 Mar.
Article
em En
| MEDLINE
| ID: mdl-30136902
ABSTRACT
Fe3O4 nanoparticles were prepared by co-precipitation of Fe2+ and Fe3+ and then modified with Au to produce an effective adsorbent (Fe3O4/Au) for aqueous Hg(II) in contaminated water. Rietveld refinement on the XRD pattern confirmed that the Fe3O4/Au was synthesised. Mössbauer spectra exhibited broad and asymmetric resonance lines with two sextets which can be assigned to tetrahedral Fe3+; and octahedral Fe3+/Fe2+. The quantitative analysis of magnetite confirms that the sample shows around 3 wt.% Au and 97 wt.% partially oxidised Fe3O4. High surface area 121 m2 g-1, average pore sizes 6.3â
nm and pore volume 1.64 cm3 g-1. The kinetics data were better fitted with a pseudo-second-order and Dubinin-Radushkevich isotherm suggests the Hg(II) adsorption onto Fe3O4/Au nanoparticles was mainly by chemical adsorption forming complex with the Au metal immobilised on Fe3O4 surfaces. Adsorption capacity of 79.59â
mg g-1. Ionic strength and co-existing ions had a slight influence on the adsorption capacity.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Poluentes Químicos da Água
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Purificação da Água
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Nanopartículas de Magnetita
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Mercúrio
Idioma:
En
Revista:
Environ Technol
Ano de publicação:
2020
Tipo de documento:
Article