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Adsorption of As(III) from aqueous solution based on porous magnetic/chitosan/ferric hydroxide microspheres prepared via electrospraying

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Abstract

Porous chitosan(CS)/magnetic(Fe3O4)/ferric hydroxide(Fe(OH)3) microsphere as novel and low-cost adsorbents for the removal of As(III) have been synthesized via the electrospraying technology by a simple process of two steps. Characterization of the obtained adsorbents was studied by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD). The adsorption kinetics and equilibrium isotherms were investigated in batch experiments. The Langmuir, Freundlich isotherm and pseudo-second order kinetic models agree well with the experimental data. The adsorption of As(III) onto CS/Fe3O4/Fe(OH)3 microspheres occurred rapidly and reached adsorption equilibrium after about 45 min. The maximum adsorption capacity of CS/Fe3O4/Fe(OH)3 microspheres, calculated by the Langmuir isotherm model, was 8.47 mg g−1, which is higher than that of CS/Fe3O4/Fe(OH)3 prepared by the conventional method (4.72 mg g−1). The results showed that the microspheres had a high adsorption capacity for As(III) and a high separation efficiency due to their microporous structure and superparamagnetic characteristics. Present research may eventually lead to a simple and low cost method for fabricating microporous materials and application for removal of arsenic from aqueous solution.

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Authors and Affiliations

  1. Alan G. MacDiarmid Institute, Jilin University, Changchun, 130012, China

    DinhThao Vu, Xiang Li & Ce Wang

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  1. DinhThao Vu
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  2. Xiang Li
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  3. Ce Wang
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Correspondence to Xiang Li or Ce Wang.

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Vu, D., Li, X. & Wang, C. Adsorption of As(III) from aqueous solution based on porous magnetic/chitosan/ferric hydroxide microspheres prepared via electrospraying. Sci. China Chem. 56, 678–684 (2013). https://doi.org/10.1007/s11426-012-4817-1

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