Copper (II) adsorption studies using models of synthetic humic acids |
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| Authors: | Marcilene Ferrari Barriquello N Consolin-Filho E R Carvalho M Y Kamogawa L Martin-Neto |
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| Institution: | 1.Department of Chemistry,Federal University of S?o Carlos—UFSCar,S?o Carlos,Brazil;2.Department of Chemistry,Federal University of Acre,Rio Branco,Brazil;3.Embrapa Agricultural Instrumentation,S?o Carlos,Brazil;4.Department of Chemistry, Luiz de Queiroz College of Agriculture,ESALQ/USP,Piracicaba,Brazil |
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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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