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Modeling of the interaction of Pu(VI) with the mixture of microorganism and clay

Pu(VI)の微生物と粘土鉱物の混合物との相互作用のモデル

大貫 敏彦; 尾崎 卓郎; 香西 直文   ; 坂本 文徳  ; 南川 卓也 ; 鈴木 義規; Francis, A. J.

Onuki, Toshihiko; Ozaki, Takuo; Kozai, Naofumi; Sakamoto, Fuminori; Nankawa, Takuya; Suzuki, Yoshinori; Francis, A. J.

Pu(VI)の微生物と粘土の混合物への吸着挙動をモデルにより検討した。Pu(VI)は微生物に吸着過程でPu(V)を経てPu(IV)に還元した。一方、粘土鉱物に吸着したPuはVIであった。Pu(VI)の吸着と還元を表す単純な速度論的なモデルを提案し、微生物,粘土鉱物及び混合物への吸着を解析した結果、Pu(VI)は水溶液中でPu(V)に還元し、微生物表面でPu(IV)に還元されることが示唆された。

In this study, we carried out experiments and model analysis of the transformation of Pu(VI) in a mixture of a common soil bacterium, Bacillus subtilis, and clay (kaolinite). A simplified kinetic model was proposed to describe the association of Pu with the mixture. In the model Pu(VI) and Pu(V) are assumed to be adsorbed on B. subtilis and kaoloinite. Pu(VI) is reduced to Pu(V) only in the solution because of simplification of the model, even though the reduction of Pu(VI) is actually occurred in solution, on B. subtilis and kaoloinite. Comparison of model estimation with experimental results suggest that kinetic simple model described the association of Pu(VI) with the mixture, and suggested that reduction of Pu(V) to Pu(IV) was mainly proceeded on the surface of B. subtilis in the mixture.

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