Synthesis of new ionic β-cyclodextrin polymers and characterization of their heavy metals retention |
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Authors: | S Berto M C Bruzzoniti R Cavalli D Perrachon E Prenesti C Sarzanini F Trotta W Tumiatti |
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Institution: | (1) Department of Analytical Chemistry, University of Torino, via P. Giuria 5, Turin, 10125, Italy;(2) Department of Pharmaceutical Sciences and Technologies, University of Torino, via P. Giuria 9, Turin, 10125, Italy;(3) Department of I.F.M. Chemistry, University of Torino, via P. Giuria 7, Turin, 10125, Italy;(4) Sea Marconi Technologies S.a.S., via Ungheria 20, Collegno, TO, 10097, Italy |
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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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Keywords: | β -cyclodextrin polymer Carboxylic derivatives Dissociation/protonation constants Metal ions Potentiometric titrations |
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