Journal
CARBOHYDRATE POLYMERS
Volume 222, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2019.114987
Keywords
Chitosan; Positron annihilation spectroscopy; Heavy metal adsorption; Structural properties
Categories
Funding
- Agencia Nacional de Promocion Cientifica y Tecnologica (ANPCyT) [PICT 2014-1785, PICT 2015-1068, PICT 2015-1832]
- Consejo Nacional de Investigaciones Cientificas y Tecnicas
- Comision de Investigaciones Cientificas de la Provincia de Buenos Aires
- SECAT (UNCPBA)
- Universidad Tecnologica Nacional
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A study of the structural changes at micro- and nano-scale in a chitosan matrix after the adsorption of different metal ions is presented. Toward this aim, samples of chitosan films soaked in different concentrations of copper (II) and chromium(VI) aqueous solutions were prepared. Cu and Cr ions were selected as sorbates since they have different ionic properties. The effect of the adsorbed metal ions on the microstructure of the chitosan matrices were studied using Fourier transformed infrared spectroscopy, UV-vis spectroscopy, differential scanning calorimetry and thermogravimetric analysis. To go further into the study of the samples at the molecular level, the nuclear technique positron annihilation lifetime spectroscopy was used. Results are discussed in terms of the interaction between the metal ions and the chitosan functional groups.
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