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Report No.
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Biomass for the separation of fission platinoids

Parajuli, D.; Hirota, Koichi; Seko, Noriaki

High level radioactive liquid waste (HLW) generated during the nuclear fuel processing is rich in valuable metals like Pd(II), Rh, Ru, etc. However, due to the stability and selectivity problems of commonly used extractants in highly acidic and radioactive condition of HLW, successful separation of useful metals is yet to realize. Expecting the potential application of Japanese Cedar Wood powder (CWP), which contains high amount of radiation-resistant lignin, we developed a sorbent containing thiamide group by dry modification of CWP with thiourea using microwave heating method. The new sorbent is found to be highly effective for the separation of Pd from simulated HLW solution. Most important result is the stability of the material with respect to the Pd loading capacity upon exposure to as high as 2000 kGy $$gamma$$ rays (10 kGy per hour). This result verifies the strong prospective of using natural material especially in extreme conditions like HLW.

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