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

Autor(es)

Barriquello, Marcilene Ferrari ^[1] ; Consolin-Filho, N. ^[2] ; Carvalho, E. R. ^[3] ; Kamogawa, M. Y. ^[4] ; Martin-Neto, L. ^[3]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: ENVIRONMENTAL CHEMISTRY LETTERS; v. 8, n. 2, p. 179-184, JUN 2010.
• Citações Web of Science: 2

Resumo

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)

• Processo FAPESP: 06/58872-0 - Identificação e monitoramento de matéria orgânica dissolvida de origem cianobacterial empregando impedância elétrica
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