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Anion induced gelation in polyvinyl alcohol: a probe for metal ion speciation studies

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Abstract

Salt solutions of certain anions viz., sulphate, phosphate and citrate are reported herein to form hydrogels in PVA solutions for the first time. Hydrogels in sulphate medium have very high viscoelastic property and higher porosity than the phosphate or citrate hydrogels as can be seen from the SEM images. An attempt to find a chemical application of these gels in the field of elemental speciation reveals that smaller cations have lesser tendency to get adsorbed on the hydrogel surface. Fe(II), Fe(III), Mn(II) have either very less or no adsorption possibility. Mn(VII) undergoes species transformation to Mn(II) in the hydrogel and shows similar behavior as Mn(II) itself. Cr(III) has a certain adsorption in the sulphate hydrogel owing to some specific interactions. Cr(VI) remains in its anionic form and hence is not adsorbed. Fe(II) and Fe(III) however can be adsorbed upon suitable complexation in the hydrogel. Phosphate hydrogel serves as the better adsorber in these two cases. All the adsorptions follow Freundlich isotherm very nicely. The hydrogels are thus eligible probes for species dependent metal adsorption studies.

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Acknowledgments

We gratefully acknowledge University Grants Commission [UGC, Sanction No. 41-248/2012 (SR)] for funding. We also thank Mr. Tridib Das, Centre for Research in Nanoscience and Nanotechnology, University of Calcutta, India, for sample preparation and obtaining SEM images. We are thankful to Dr. P. Dey of IISER Kolkata for rheological studies. One of the authors, P. S. expresses sincere thanks to the UGC, India [Memo No. UGC/1228C/Major Research (SC) 2012] for providing necessary fellowship.

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  1. Department of Chemistry, University of Calcutta, 92 APC Road, Kolkata, 700009, India

    Pallabi Samaddar & Kamalika Sen

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  1. Pallabi Samaddar
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  2. Kamalika Sen
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Correspondence to Kamalika Sen.

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Samaddar, P., Sen, K. Anion induced gelation in polyvinyl alcohol: a probe for metal ion speciation studies. J Sol-Gel Sci Technol 73, 389–395 (2015). https://doi.org/10.1007/s10971-014-3545-8

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  • DOI: https://doi.org/10.1007/s10971-014-3545-8

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