Removal of arsenic from aqueous systems by use of magnetic Fe3O4@TiO2 nanoparticles

Removal of arsenic from aqueous systems by use of magnetic Fe3O4@TiO2 nanoparticles Fe3O4 magnetic nanoparticles coated with a TiO2 film (Fe3O4@TiO2 nanoparticles) have been synthesized by use of a modified Stöber method and used for removal of inorganic arsenic ions from aqueous solution. The high saturation magnetization of Fe3O4@TiO2 nanoparticles (45.56 emu g−1) facilitates their separation from aqueous solutions by use of a moderate magnetic field. The ζ-potential of Fe3O4@TiO2 nanoparticles was approximately 5.8. Sorption data were in good agreement with a pseudo-second-order kinetic model, with faster adsorption of As(III) (3.24 × 10−5 μg g−1 min−1) than As(V) (2.56 × 10−6 μg g−1 min−1). Adsorption isotherms were a good fit to the Freundlich isotherm model; adsorption capacity was 13.1 and 10.5 mg g−1 for As(III) and As(V), respectively. The effects on adsorption of such environmental conditions as pH, coexisting phosphate and sulfate ions, and humic acid were studied. Research on Chemical Intermediates Springer Journals

Removal of arsenic from aqueous systems by use of magnetic Fe3O4@TiO2 nanoparticles

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Springer Netherlands
Copyright © 2013 by Springer Science+Business Media Dordrecht
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
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