Selective recovery of uranium and thorium ions from dilute aqueous solutions by animal biopolymers |
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Authors: | Ishikawa Shin-ichi Suyama Kyozo Arihara Keizo Itoh Makoto |
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Institution: | (1) Department of Applied Bioorganic Chemistry, Division of Life Science, Graduate School of Agricultural Science, Tohoku University, 981-8555 Sendai, Japan;(2) Faculty of Animal Science, School of Veterinary Medicine and Animal Sciences, Kitasato University, 034-8628 Towada, Aomori, Japan;(3) Present address: Faculty of Animal Science, School of Veterinary Medicine and Animal Sciences, Kitasato University, 034-8628 Towada, Aomori, Japan |
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Abstract: | Selective actinide ion recovery from dilute, aqueous, multication waste streams is an important problem. The recovery of uranium
(U) and thorium (Th) by various animal biopolymers was examined. Of four species of biopolymers tested, a high uptake of uranium
and thorium was found in hen eggshell membrane (ESM) and silk proteins, with the maximum uranium and thorium recovery exceeding
98% and 79%, respectively. The uptake of U and Th was significantly affected by the pH of the solution. The optimum pH values
were 6 and 3 for the uptake of U and Th, respectively. The effect of temperature differed with the metal. The uptake of U
decreased with increasing temperature (30–50°C), whereas the Th uptake increased with increasing temperature. Selective recovery
of U and Th from dilute aqueous binary and multimetal solutions was also examined. ESM and silk proteins tested were effective
and selective for removing each metal by controlling the pH and temperature of the solution. In multimetal systems, the order
of sorption of ESM proteins was preferential: U > Cu > Cd > Mn > Pb > Th > Ni > Co > Zn at pH 6 and Th > U > Cu > Pb > Cd
> Mn > Co > Ni = Zn at pH 3. These biopolymers appear to have potential for use in a commercial process for actinide recovery
from actinide-containing wastewater. |
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Keywords: | Actinide uranium thorium biopolymer eggshell membrane silk biosorption selective recovery |
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