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Open AccessArticle

Some Properties of Electron Beam-Irradiated Sheep Wool Linked to Cr(III) Sorption

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Constantine the Philosopher University in Nitra, Faculty of Natural Sciences, Department of Chemistry, Tr. A. Hlinku 1, 949 74 Nitra, Slovakia
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Polymer Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 845 41 Bratislava 45, Slovakia
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PROGRESA FINAL SK, s.r.o., Ferienčíkova 18, 811 08 Bratislava-Staré Mesto, Slovakia
*
Author to whom correspondence should be addressed.
Molecules 2019, 24(23), 4401; https://doi.org/10.3390/molecules24234401
Received: 4 November 2019 / Revised: 15 November 2019 / Accepted: 19 November 2019 / Published: 2 December 2019
(This article belongs to the Section Materials Chemistry)
We examined the characteristics of an electron beam irradiated wool with an absorbed dose of (21–410) kGy in comparison with natural wool with respect to the determination of the isoelectric point (IEP), zero charge point (ZCP), mechanism of Cr(III) sorption from higher concentrated solutions, and the modelling of the wool-Cr(III) interaction. The data of ZPC and IEP differed between natural and irradiated samples. Increasing the dose shifted the pH of ZPC from 6.85 for natural wool to 6.20 for the highest dosed wool, while the natural wool IEP moved very little, from pH = 3.35 to 3.40 for all of the irradiated samples. The sorption experiments were performed in a pH bath set at 3.40, and the determination of the residual Cr(III) in the bath was performed by VIS spectrometry under optimized conditions. The resulting sorptivity showed a monotonically rising trend with increasing Cr(III) concentration in the bath. Lower doses, unlike higher doses, showed better sorptivity than the natural wool. FTIR data indicated the formation of complex chromite salts of carboxylates and cysteinates. Crosslinks via ligands coming from different keratin chains were predicted, preferably on the surface of the fibers, but to a degree that did not yet inhibit the diffusion of Cr(III)-cations into the fiber volume. We also present a concept of a complex octahedral structure. View Full-Text
Keywords: sheep wool; electron irradiation; point of zero charge; isoelectric point; chromium sorption; chromium complex sheep wool; electron irradiation; point of zero charge; isoelectric point; chromium sorption; chromium complex
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Braniša, J.; Kleinová, A.; Jomová, K.; Malá, R.; Morgunov, V.; Porubská, M. Some Properties of Electron Beam-Irradiated Sheep Wool Linked to Cr(III) Sorption. Molecules 2019, 24, 4401.

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