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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Barriquello, Marcilene Ferrari [1] ; Consolin-Filho, N. [2] ; Carvalho, E. R. [3] ; Kamogawa, M. Y. [4] ; Martin-Neto, L. [3]
Total Authors: 5
Affiliation:
[1] Univ Fed Sao Carlos, Dept Chem, BR-13565905 Sao Carlos, SP - Brazil
[2] Univ Fed Acre, Dept Chem, BR-69915900 Rio Branco, AC - Brazil
[3] Embrapa Agr Instrumentat, BR-13560970 Sao Carlos, SP - Brazil
[4] USP, ESALQ, Dept Chem, Luiz de Queiroz Coll Agr, BR-13418900 Piracicaba, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: ENVIRONMENTAL CHEMISTRY LETTERS; v. 8, n. 2, p. 179-184, JUN 2010.
Web of Science Citations: 2
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 Cu(2+) 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 Cu(2+) ion presented a favorable adsorption, with RL (equilibrium parameter) responses in Langmuir isotherms falling within the desirable ranges. (AU)