Biosorption of copper ions by dried leaves: chemical bonds and site symmetry

The biosorption of copper by dried leaves was studied by Fourier transform infrared spectroscopy (FTIR) and electron paramagnetic resonance (EPR). From FTIR measurements, we conclude that the presence of copper ions in the biomass affects the bands corresponding to CC vibrations of carbon rings of...

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Bibliographic Details
Published in:Hydrometallurgy 2003-10, Vol.71 (1), p.277-283
Main Authors: de Carvalho, R.P., Freitas, J.R., de Sousa, A.-M.G., Moreira, R.L., Pinheiro, M.V.B., Krambrock, K.
Format: Article
Language:English
Subjects:
Applied sciences
Biosorption
Copper
Dried leaves
EPR
Exact sciences and technology
FTIR
Hydrometallurgy
Metals. Metallurgy
Production of metals
Production of non ferrous metals. Process materials
Sorption
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Summary:The biosorption of copper by dried leaves was studied by Fourier transform infrared spectroscopy (FTIR) and electron paramagnetic resonance (EPR). From FTIR measurements, we conclude that the presence of copper ions in the biomass affects the bands corresponding to CC vibrations of carbon rings of the biomass. In the EPR spectra, the Cu 2+ ion is seen to be incorporated into the biomass in a site with an axial symmetry. We propose a model for the sorption site where the copper ions are located between two adjacent carbon rings in an interstitial site in the fibers of the biomass.
ISSN:0304-386X
1879-1158
DOI:10.1016/S0304-386X(03)00166-X