生物矿化
铀
苏云金杆菌
矿化(土壤科学)
胞外聚合物
生物修复
环境化学
化学
杀生物剂
微生物
细胞外
核化学
化学工程
生物化学
污染
地质学
生物
生态学
细菌
冶金
材料科学
生物膜
有机化学
古生物学
氮气
工程类
作者
Ting Zhu,Qian Zeng,Changsong Zhao,Yufeng Wen,Shangqing Li,Feize Li,Tu Lan,Yuanyou Yang,Ning Liu,Qun Sun,Jiali Liao
标识
DOI:10.1016/j.jenvrad.2023.107126
摘要
Uranium biomineralization can slow uranium migration in the environment and thus prevent it from further contaminating the surroundings. Investigations into the uranium species, pH, inorganic phosphate (Pi) concentration, and microbial viability during biomineralization by microorganisms are crucial for understanding the mineralization mechanism. In this study, Bacillus thuringiensis X-27 was isolated from soil contaminated with uranium and was used to investigate the formation process of uranium biominerals induced by X-27. The results showed that as biomineralization proceeded, amorphous uranium-containing deposits were generated and transformed into crystalline minerals outside cells, increasing the overall concentration of uramphite. This is a cumulative rather than abrupt process. Notably, B. thuringiensis X-27 precipitated uranium outside the cell surface within 0.5 h, while the release of Pi into the extracellular environment and the change of pH to alkalescence further promoted the formation of uramphite. In addition, cell viability determination showed that the U(VI) biomineralization induced by B. thuringiensis X-27 was instrumental in alleviating the toxicity of U(VI) to cells. This work offers insight into the mechanism of U(VI) phosphate biomineralization and is a reference for bioremediation-related studies.
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