Modeling of the Interaction of Pu(VI) with the Mixture of Microorganism and Clay
Modeling of the Interaction of Pu(VI) with the Mixture of Microorganism and Clay
复制标题
Pu(VI) 与微生物和粘土混合物相互作用的模拟
DOI：
10.1080/18811248.2007.9711507
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
A. J. Francis
中科院分区：
文献类型：
--
作者：
T. Ohnuki;T. Yoshida;T. Ozaki;N. Kozai;F. Sakamoto;T. Nankawa;Y. Suzuki;A. J. Francis
Pu（VI）在一种常见的土壤细菌，枯草芽孢杆菌和高岭石粘土的混合物中的转化进行了模型分析。提出了一个简化的动力学模型，其中假定Pu（VI）和Pu（V）的吸附处于瞬时平衡，Pu（VI）还原为Pu（V）再还原为Pu（IV）的两步反应符合一级速率定律。当我们在模型分析中假设Pu（V）还原为Pu（IV）的速率比B高时，通过对高岭石的subtilisthan分析，估算了Pu在溶液和混合物中的含量，以及Pu在溶液和混合物中的氧化态，结果与实测值吻合较好。相反，假设Pu（V）在高岭石中还原为Pu（IV）的速率与B相同。枯草杆菌对Pu与混合物的缔合作了错误的预测。这些结果有力地表明，在Pu（VI）在混合物中积累期间，细菌细胞上的Pu（V）通过细菌介导的电子转移过程被还原为Pu（IV）。
A model analysis of the transformation of Pu(VI) in a mixture of a common soil bacterium,Bacillus subtilis, and kaolinite clay was carried out. A simplified kinetic model, where the adsorptions of Pu(VI) and Pu(V) are assumed to be in instantaneous equilibrium and the two-step reduction of Pu(VI) to Pu(V) and then to Pu(IV) is described by a first-order rate law, was proposed. When we assumed in the model analysis that the reduction rate of Pu(V) to Pu(IV) was higher forB. subtilisthan for kaolinite, the estimated fractions of Pu in the solution and in the mixture, and the oxidation states of Pu in the solution and in the mixture were in good agreement with the measured ones. On the contrary, the assumption that the reduction rate of Pu(V) to Pu(IV) for kaolinite was the same as that forB. subtilisgave a wrong prediction of Pu association with the mixture. These results strongly suggest that Pu(V) on the bacterial cell is reduced to Pu(IV) by the bacterially mediated electron transfer process during the accumulation of Pu(VI) in the mixture.