含磷化合物生物矿化铀的形态转化与机理  

Morphological Transformation and Mechanism of Phosphorus-containing Compounds Biomineralized Uranium

作　　者：寸金芝 彭雷 庞超 吴寒 刘迎云 谭文发 CUN Jinzhi;PENG Lei;PANG Chao;WU Han;LIU Yingyun;TAN Wenfa(School of Resources Environment and Safety Engineering,University of South China,Hengyang,Hunan 421001,China;Key Laboratory of Soil Pollution Control and Remediation,University of South China,Hengyang,Hunan 421001,China)

机构地区：[1]南华大学资源环境与安全工程学院,湖南衡阳421001 [2]南华大学土壤污染控制与修复重点实验室,湖南衡阳421001

出　　处：《南华大学学报（自然科学版）》2023年第5期9-14,共6页Journal of University of South China：Science and Technology

基　　金：国家自然科学基金项目(12075113);湖南省教育厅科学研究重点项目(20A428)。

摘　　要：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。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 com-pounds 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.

关 键 词：含磷化合物 铀形态 土著细菌 生物修复 

分 类 号：X172[环境科学与工程—环境科学] X751