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Novel chitosan/PVA/zerovalent iron biopolymeric nanofibers with enhanced arsenic removal applications

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Abstract

Enhanced removal application of both forms of inorganic arsenic from arsenic-contaminated aquifers at near-neutral pH was studied using a novel electrospun chitosan/PVA/zerovalent iron (CPZ) nanofibrous mat. CPZ was carefully examined using scanning electron microscopy (SEM) equipped with energy-dispersive X-ray analysis (EDX), transmission electron microscopy (TEM), atomic fluorescence spectroscopy (AFM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and thermal gravimetric analysis (TGA). Application of the adsorbent towards the removal of total inorganic arsenic in batch mode has also been studied. A suitable mechanism for the adsorption has also been discussed. CPZ nanofibers mat was found capable to remove 200.0 ± 10.0 mg g−1 of As(V) and 142.9 ± 7.2 mg g−1 of As(III) from aqueous solution of pH 7.0 at ambient condition. Addition of ethylenediaminetetraacetic acid (EDTA) enabled the stability of iron in zerovalent state (ZVI). Enhanced capacity of the fibrous mat could be attributed to the high surface area of the fibers, presence of ZVI, and presence of functional groups such as amino, carboxyl, and hydroxyl groups of the chitosan and EDTA. Both Langmuir and Freundlich adsorption isotherms were applicable to describe the removal process. The possible mechanism of adsorption has been explained in terms of electrostatic attraction between the protonated amino groups of chitosan/arsenate ions and oxidation of arsenite to arsenate by Fentons generated from ZVI and subsequent complexation of the arsenate with the oxidized iron. These CPZ nanofibrous mats has been prepared with environmentally benign naturally occurring biodegradable biopolymer chitosan, which offers unique advantage in the removal of arsenic from contaminated groundwater.

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Authors and Affiliations

  1. Centre for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, U.P., 208016, India

    Divya Chauhan & Nalini Sankararamakrishnan

  2. Department of Chemistry, Banasthali Vidyapith, Rajasthan, 304022, India

    Divya Chauhan & Jaya Dwivedi

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  1. Divya Chauhan
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  2. Jaya Dwivedi
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  3. Nalini Sankararamakrishnan
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Correspondence to Nalini Sankararamakrishnan.

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Chauhan, D., Dwivedi, J. & Sankararamakrishnan, N. Novel chitosan/PVA/zerovalent iron biopolymeric nanofibers with enhanced arsenic removal applications. Environ Sci Pollut Res 21, 9430–9442 (2014). https://doi.org/10.1007/s11356-014-2864-1

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