Abstract
The adsorption of chromium(VI) from potassium bichromate solutions on the silk fibroin fiber was investigated. The following results were obtained:1) The amounts of adsorbed Cr(VI) decreased with elevating pH of treating solutions. This decreases were arised from electrostatic repulsion between Cr(VI) anions and charged silk negatively, because the charges of silk become negative with elevating pH.2) Most of the adsorbed Cr(VI) on the silk were desorbed by washing with distillated water or N/100 NaOH solution. But the Cr(III) resulted from the reduction of Cr(Vl) in the silk at 80°C were not desorbed.3) The adsorption isotherms of Cr(VI) were showed by Freundlich's equation at 25°C where the side reaction of Cr(VI)→Cr(III) did not occur.4) The initially adsorbed amount of Cr decreased with elevating temperature due to the elevated pH of Cr(VI) solution and Cr(VI)→Cr(III) side reaction.5) The second step adsorption of Cr at 60°C and 80°C was recognized to be of Fickian type.
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