Novel polyamidoamine-based hydrogel with an innovative molecular architecture as a Co2+-, Ni2+-, and Cu2+-sorbing material: Cyclovoltammetry and extended X-ray absorption fine structure studies

Authors

  • Paolo Ferruti,

    Corresponding author
    1. Department of Organic and Industrial Chemistry and Interdisciplinary Centre of Nanostructured Interfaces and Materials, University of Milano, Via Venezian 21, 20133 Milano
    • Department of Organic and Industrial Chemistry and Interdisciplinary Centre of Nanostructured Interfaces and Materials, University of Milano, Via Venezian 21, 20133 Milano
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  • Elisabetta Ranucci,

    1. Department of Organic and Industrial Chemistry and Interdisciplinary Centre of Nanostructured Interfaces and Materials, University of Milano, Via Venezian 21, 20133 Milano
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  • Sabrina Bianchi,

    1. Department of Organic and Industrial Chemistry and Interdisciplinary Centre of Nanostructured Interfaces and Materials, University of Milano, Via Venezian 21, 20133 Milano
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  • Luigi Falciola,

    1. Department of Physical Chemistry and Electrochemistry and Interdisciplinary Centre of Nanostructured Interfaces and Materials, University of Milano, Via Golgi 19, 20133 Milano
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  • Patrizia R. Mussini,

    1. Department of Physical Chemistry and Electrochemistry and Interdisciplinary Centre of Nanostructured Interfaces and Materials, University of Milano, Via Golgi 19, 20133 Milano
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  • Manuela Rossi

    1. Department of Physical Chemistry and Electrochemistry and Interdisciplinary Centre of Nanostructured Interfaces and Materials, University of Milano, Via Golgi 19, 20133 Milano
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Abstract

An amphoteric polyamidoamine (PAA)-based hydrogel, named INT-PAA1, with a novel molecular architecture was prepared and studied as a Co2+-, Ni2+-, and Cu2+-sorbing material. This hydrogel was obtained by the synthesis of a PAA in the presence of a second presynthesized PAA carrying many primary amino groups as side substituents, which acted as a macromolecular crosslinking agent. Therefore, it had an intersegmented structure. INT-PAA1 exhibited a remarkable sorption capacity and sorption rate for Co2+, Ni2+, and Cu2+ that were advantageously in situ monitored by cyclic voltammetry. An extended X-ray absorption fine structure spectroscopy characterization of the Co2+/INT-PAA1 complex was also performed. The very fast and quantitative metal-ion uptake, made apparent by an intense coloring of the hydrogel, showed remarkable potential for environmental applications such as heavy-metal detection, recovery, and elimination. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 2316–2327, 2006

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