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KMID : 1041219960380010025
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Journal of Sericultural and Entomological Science
1996 Volume.38 No. 1 p.25 ~ p.30
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Characterization of Chromium(Ⅵ) Adsorption onto Silk Fabrics
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Abstract
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The adsorption mechanism of Chromium(VI) uptake in silk fibroin fibers was discussed. The adsorption equilibrium of Chromium(Vl) is significantly influenced by the initial adsorption rate and it showed 52% of the equilibrium uptake. The Chromium(Vl) uptake by silk fibroinis increased with the acidic range of pH, which react upon Chromium(VI) oxidations. The enthalpy change in the Chromium(Vl) on the temperatures, △H, was found to be 39.7 KJ ·mol-1. It means that the Chromium(Vl) adsorption proceeds via a certain complex chemical reaction and the Chromium complex was found to be coordinated with carbonyl group of amides from the result of infrared spectra. The chroming of silk fibroin fibers is moderated in the conditions of 50°C, pH 2.4, and 3 hours, which prevent from the loss of physical properties. The equilibrium adsorption is attained at 5×10-3M of Chromium(Vl) solutions.
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