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Adsorptive removal of arsenic from water by an iron-zirconium binary oxide adsorbent

Ren, Zongming ; Zhang, Gaosheng ; Chen, J Paul

Journal of colloid and interface science, 01 June 2011, Vol.358(1), pp.230-7 [Periódico revisado por pares]

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  • Título:
    Adsorptive removal of arsenic from water by an iron-zirconium binary oxide adsorbent
  • Autor: Ren, Zongming ; Zhang, Gaosheng ; Chen, J Paul
  • Assuntos: Arsenic -- Isolation & Purification ; Ferric Compounds -- Chemistry ; Water -- Chemistry ; Water Purification -- Methods ; Zirconium -- Chemistry
  • É parte de: Journal of colloid and interface science, 01 June 2011, Vol.358(1), pp.230-7
  • Descrição: Arsenate and arsenite may exist simultaneously in groundwater and have led to a greater risk to human health. In this study, an iron-zirconium (Fe-Zr) binary oxide adsorbent for both arsenate and arsenite removal was prepared by a coprecipitation method. The adsorbent was amorphous with a specific surface area of 339 m(2)/g. It was effective for both As(V) and As(III) removal; the maximum adsorption capacities were 46.1 and 120.0 mg/g at pH 7.0, respectively, much higher than for many reported adsorbents. Both As(V) and As(III) adsorption occurred rapidly and achieved equilibrium within 25 h, which were well fitted by the pseudo-second-order equation. Competitive anions hindered the sorption according to the sequence PO(4)(3-)>SiO(3)(2-)>CO(3)(2-)>SO(4)(2-). The ionic strength effect experiment, measurement of zeta potential, and FTIR study indicate that As(V) forms inner-sphere surface complexes, while As(III) forms both inner- and outer-sphere surface complexes at the water/Fe-Zr binary...
  • Idioma: Inglês

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