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

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 ad...

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Bibliographic Details
Published in:Environmental chemistry letters 2010-06, Vol.8 (2), p.179-184
Main Authors: Barriquello, Marcilene Ferrari, Consolin-Filho, N., Carvalho, E. R., Kamogawa, M. Y., Martin-Neto, L.
Format: Article
Language:English
Subjects:
Adsorption
Analytical Chemistry
Chemical synthesis
Copper
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Geochemistry
Humic acids
Mathematical models
Original Paper
Pollution
Polymers
Soil sciences
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Summary: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.
ISSN:1610-3653
1610-3661
DOI:10.1007/s10311-009-0206-1