生物矿化
生物吸附
生物修复
化学
环境修复
胞外聚合物
环境化学
嗜麦芽窄食单胞菌
磷酸盐
核化学
化学工程
吸附
细菌
生物膜
生物化学
吸附
污染
地质学
生态学
生物
有机化学
工程类
古生物学
铜绿假单胞菌
作者
Iván Sánchez-Castro,Pablo Martínez-Rodríguez,Fadwa Jroundi,Pier Lorenzo Solari,Michaël Descostes,Mohamed L. Merroun
出处
期刊:Water Research
[Elsevier]
日期:2020-09-01
卷期号:183: 116110-116110
被引量:43
标识
DOI:10.1016/j.watres.2020.116110
摘要
The environmental impact of uranium released during nuclear power production and related mining activity is an issue of great concern. Innovative environmental-friendly water remediation strategies, like those based on U biomineralization through phosphatase activity, are desirable. Here, we report the great U biomineralization potential of Stenotrophomonas sp. Br8 CECT 9810 over a wide range of physicochemical and biological conditions. Br8 cells exhibited high phosphatase activity which mediated the release of orthophosphate in the presence of glycerol-2-phosphate around pH 6.3. Mobile uranyl ions were bioprecipitated as needle-like fibrils at the cell surface and in the extracellular space, as observed by Scanning Transmission Electron Microscopy (STEM). Extended X-Ray Absorption Fine Structure (EXAFS) and X-Ray Diffraction (XRD) analyses showed the local structure of biogenic U precipitates to be similar to that of meta-autunite. In addition to the active U phosphate biomineralization process, the cells interact with this radionuclide through passive biosorption, removing up to 373 mg of U per g of bacterial dry biomass. The high U biomineralization capacity of the studied strain was also observed under different conditions of pH, temperature, etc. Results presented in this work will help to design efficient U bioremediation strategies for real polluted waters.
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