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Copper (II) adsorption studies using models of synthetic humic acids

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Abstract

A polymer with characteristics similar to those of humic acids was obtained by synthesis reactions from oxidative polymerization in an alkaline medium using para-benzoquinone, hydroquinone and 4-aminobenzoic acid as precursors. Samples of natural and synthetic humic acid were used to examine the adsorption behavior of Cu2+ ions on these substrates. The mathematical models described by Langmuir and Freundlich equations were applied, yielding the maximum adsorption intensity values K′ (Langmuir), maximum adsorption capacity, b (Langmuir) and the adsorbent adsorption capacity, m (Freundlich). Based on solubility studies, pH 3 was selected for the development of the adsorption experiment. The Cu2+ ion presented a favorable adsorption, with RL (equilibrium parameter) responses in Langmuir isotherms falling within the desirable ranges.

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Acknowledgments

CAPES (Brazil) is acknowledged for awarding a PRODOC grant to Marcilene Ferrari Barriquello. We also gratefully acknowledge CNPq (proc. 478918/2007-0), FAPESP (proc. 06/58872-0, 06/60767-0) and EMBRAPA Agricultural Instrumentation for their financial support of this work.

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Authors and Affiliations

  1. Department of Chemistry, Federal University of São Carlos—UFSCar, C. Postal 676, São Carlos, SP, 13565-905, Brazil

    Marcilene Ferrari Barriquello

  2. Department of Chemistry, Federal University of Acre, BR 364, Km 04, Rio Branco, AC, 69915-900, Brazil

    N. Consolin-Filho

  3. Embrapa Agricultural Instrumentation, C. Postal 741, São Carlos, SP, 13560-970, Brazil

    E. R. Carvalho & L. Martin-Neto

  4. Department of Chemistry, Luiz de Queiroz College of Agriculture, ESALQ/USP, Av. Pádua Dias, Piracicaba, SP, 13418-900, Brazil

    M. Y. Kamogawa

Authors
  1. Marcilene Ferrari Barriquello
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  2. N. Consolin-Filho
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  3. E. R. Carvalho
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  4. M. Y. Kamogawa
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  5. L. Martin-Neto
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Correspondence to Marcilene Ferrari Barriquello.

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Barriquello, M.F., Consolin-Filho, N., Carvalho, E.R. et al. Copper (II) adsorption studies using models of synthetic humic acids. Environ Chem Lett 8, 179–184 (2010). https://doi.org/10.1007/s10311-009-0206-1

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  • DOI: https://doi.org/10.1007/s10311-009-0206-1

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