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Synthesis of new ionic β-cyclodextrin polymers and characterization of their heavy metals retention

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Abstract

In this study, a new aqueous insoluble ionic β-cyclodextrin polymer (PYR), synthesized by reaction of β-cyclodextrin with pyromellitic anhydride [1], is characterized by IR spectroscopy, showing typical cyclodextrin and carboxylic absorptions. pH-metric titrations of the acidic functions with standard NaOH solutions followed by a refinement of protonation constants, with specific software for equilibrium in solution, have been performed. Through this approach, the pK a values of the functional groups have been calculated. The complexation capabilities of PYR towards metal ions [Al(III), Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Pd(II), Cd(II), Pt(IV), Tl(I), and U(IV)] have been evaluated in aqueous solution (pH 3–5). The retention is mainly pH dependent and higher than 70% for Al(III), Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Pd(II), Cd(II) and U(IV). For Tl(I) and Pt(IV) the retention is about 60% and 40% respectively.

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Acknowledgements

The financial contribution (PRIN 2004) from MIUR (Ministero dell’Istruzione, dell’Università e della Ricerca), Italy is gratefully acknowledged.

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Authors and Affiliations

  1. Department of Analytical Chemistry, University of Torino, via P. Giuria 5, Turin, 10125, Italy

    S. Berto, M. C. Bruzzoniti, D. Perrachon, E. Prenesti & C. Sarzanini

  2. Department of Pharmaceutical Sciences and Technologies, University of Torino, via P. Giuria 9, Turin, 10125, Italy

    R. Cavalli

  3. Department of I.F.M. Chemistry, University of Torino, via P. Giuria 7, Turin, 10125, Italy

    F. Trotta

  4. Sea Marconi Technologies S.a.S., via Ungheria 20, Collegno, TO, 10097, Italy

    W. Tumiatti

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  1. S. Berto
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  2. M. C. Bruzzoniti
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Correspondence to M. C. Bruzzoniti.

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Berto, S., Bruzzoniti, M.C., Cavalli, R. et al. Synthesis of new ionic β-cyclodextrin polymers and characterization of their heavy metals retention. J Incl Phenom Macrocycl Chem 57, 631–636 (2007). https://doi.org/10.1007/s10847-006-9273-0

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  • DOI: https://doi.org/10.1007/s10847-006-9273-0

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