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Molecules 2018, 23(12), 3180; https://doi.org/10.3390/molecules23123180

Why Natural or Electron Irradiated Sheep Wool Show Anomalous Sorption of Higher Concentrations of Copper(II)

1
Constantine the Philosopher University in Nitra, Faculty of Natural Science, Department of Chemistry, Tr. A. Hlinku 1, 94974 Nitra, Slovakia
2
Polymer Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 84541 Bratislava 45, Slovakia
3
PROGRESA FINAL SK, s.r.o., Ferienčíkova 18, 81108 Bratislava-Staré Mesto, Slovakia
*
Author to whom correspondence should be addressed.
Received: 14 November 2018 / Revised: 29 November 2018 / Accepted: 30 November 2018 / Published: 2 December 2018
(This article belongs to the Section Materials Chemistry)
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Abstract

Sorption of higher concentrations of Cu(II) solution onto natural sheep wool or wool irradiated by an electron beam was studied. Sorption isotherms were of unexpected character, showing extremes. The samples with lower absorbed doses adsorbed less than non-irradiated wool, while higher doses led to increased sorption varying with both concentration and dose. FTIR spectra taken from the fibre surface and bulk were different. It was concluded that there was formation of Cu(II)-complexes of carboxylic and cysteic acids with ligands coming from various keratin macromolecules. Clusters of chains crosslinked through the ligands on the surface limit diffusion of Cu(II) into the bulk of fibre, thus decreasing the sorption. After exhausting the available ligands on the surface the remaining Cu(II) cations diffuse into the keratin bulk. Here, depending on accessibility of suitable ligands, Cu(II) creates simple or complex salts giving rise to the sorption extremes. Suggestion of a mechanism for this phenomenon is presented. View Full-Text
Keywords: sheep wool; electron irradiation; copper sorption; copper complexes; clusters sheep wool; electron irradiation; copper sorption; copper complexes; clusters
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Porubská, M.; Kleinová, A.; Hybler, P.; Braniša, J. Why Natural or Electron Irradiated Sheep Wool Show Anomalous Sorption of Higher Concentrations of Copper(II). Molecules 2018, 23, 3180.

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