含磷化合物生物矿化铀的形态转化与机理

磷元素作为微生物生存生长的必要元素，能有效与铀结合矿化成稳定的U-P沉淀或相应矿物。采用混合细菌介导法，添加含磷化合物处理铀污染地下水-沉积物，探究磷和土著菌相互作用下铀的形态变化及产物稳定性。结果表明：含磷化合物的添加使得溶液中铀去除率高达99.84%;改进连续提取实验得知，沉积物中磷作用后的铀稳定态比例约75%。根据X射线光电子能谱分析和改进连续提取实验结果，细菌可以有效地介导U-P沉淀，含磷化合物可以与六价铀络合形成稳定的沉淀物，结合X射线衍射表明在细菌作用下，磷与铀发生生物矿化可生成Ca-U-P沉淀，实现铀从可转移相到稳定相的转化与固定。

Morphological Transformation and Mechanism of Phosphorus-containing Compounds Biomineralized Uranium

As an essential element for the survival and growth of microorganisms, phosphorus can effectively combine with uranium to mineralize into stable U-P precipitates or corresponding minerals. A mixed bacterial-mediated method was applied to address uranium-contaminated groundwater-sediments with the addition of phosphorus-containing compounds to investigate the morphological variations and the stability of uranium products under the interaction of phosphorus and indigenous bacteria. The results showed that the addition of phosphorus-containing compounds resulted in 99.84% removal of uranium from the solution. The Modified Community Bureau of Reference revealed that the proportion of uranium in the sediment in the stable state after phosphorus action was about 75%. According to the results of the X-ray Photoelectron Spectroscopy and The Modified Community Bureau of Reference, bacteria can effectively mediate U-P precipitation and phosphate can complex with hexavalent uranium to form stable precipitates. Combined with the X-Ray Diffraction, it showed that phosphorus and uranium undergo biomineralization under the action of bacteria can generate Ca-U-P precipitates to realize the conversion and immobilization of uranium from metastable phase to stable phase.