Microbial removal of uranyl by sulfate reducing bacteria in the presence of Fe (III) (hydr)oxides

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	Microbial removal of uranyl by sulfate reducing bacteria in the presence of Fe (III) (hydr)oxides
	Yi Zhengji
刊名	Journal of Environmental Radioactivity
	2010
卷号	101 期号:9 页码:700-705
关键词	Uranium Sulfate Reducing Bacteria (Srb) Hematite Goethite Uraninite
英文摘要	Microbiological reduction of uranyl by sulfate reducing bacteria (SRB) has been proposed as a promising method for removal of radionuclide from groundwater. In this study, we examined the effect of two naturally occurring Fe(III) (hydr)oxides, hematite and goethite, on the bioreduction of U(VI) by a mixed culture of SRB via laboratory batch experiments. The biogenic precipitate from U(VI) bioreduction was determined using X-ray absorption near edge structure (XANES) analysis, showing a typical feature of uraninite (UO₂). In the presence of either hematite or goethite-containing Fe(III) ranging from 10 to 30 mM, the reduction of U(VI) was retarded by both minerals and the retardatory effect was enhanced with increasing amount of Fe(III) (hydr)oxide. When exposed to a mixture of hematite and goethite with the total Fe(III) kept constant at 20 mM, the retardatory effect on U(VI) reduction by the minerals were directly correlated with the fraction of hematite present. A slow increase in U(VI) concentration was also found in all Fe(III) (hydr)oxide treatments after 10–13 days, accompanied by the release of Fe(II) into the solution. The presence of Fe(III) (hydr)oxide can cause the eventual incomplete bioreduction of U(VI). However, it was not the case for the control without minerals. When mixing biogenic uraninite with hematite or goethite without SRB, Fe(II) was also detected in the solution. These findings suggest that the U(VI) remobilization after 10～13 days may be due to reoxidation of the uraninite by the solid-phase Fe(III) (hydr)oxide.
学科主题	环境地球化学
语种	英语
公开日期	2017-12-21
内容类型	期刊论文
源URL	[http://ir.gyig.ac.cn:8080/handle/352002/6850]
专题	地球化学研究所_环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
推荐引用方式 GB/T 7714	Yi Zhengji. Microbial removal of uranyl by sulfate reducing bacteria in the presence of Fe (III) (hydr)oxides[J]. Journal of Environmental Radioactivity,2010,101(9):700-705.
APA	Yi Zhengji.(2010).Microbial removal of uranyl by sulfate reducing bacteria in the presence of Fe (III) (hydr)oxides.Journal of Environmental Radioactivity,101(9),700-705.
MLA	Yi Zhengji."Microbial removal of uranyl by sulfate reducing bacteria in the presence of Fe (III) (hydr)oxides".Journal of Environmental Radioactivity 101.9(2010):700-705.