| Microbial removal of uranyl by sulfate reducing bacteria in the presence of Fe (III) (hydr)oxides |
| Yi Zhengji
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| 2010
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发表期刊 | Journal of Environmental Radioactivity
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卷号 | 101期号:9页码:700-705 |
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. |
关键词 | Uranium
Sulfate Reducing Bacteria (Srb)
Hematite
Goethite
Uraninite
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学科领域 | 环境地球化学
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收录类别 | SCI
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语种 | 英语
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文献类型 | 期刊论文
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条目标识符 | http://ir.gyig.ac.cn/handle/352002/6850
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专题 | 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
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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.
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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.
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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.
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文件名:
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Microbial removal of uranyl by sulfate reducing bacteria in the presence of Fe (III) (hydr)oxides.pdf
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Adobe PDF
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