| Microbial removal of uranyl by sulfate reducing bacteria in the presence of Fe (III) (hydr)oxides | |
| Yi Zhengji | |
| 2010 | |
| Source Publication | Journal of Environmental Radioactivity
 |
| Volume | 101Issue:9Pages:700-705 |
| Abstract | 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. |
| Keyword | Uranium Sulfate Reducing Bacteria (Srb) Hematite Goethite Uraninite |
| Subject Area | 环境地球化学 |
| Indexed By | SCI |
| Language | 英语 |
| Document Type | 期刊论文 |
| Identifier | http://ir.gyig.ac.cn/handle/352002/6850 |
| Collection | 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 |
| Recommended Citation 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. |
| Files in This Item: | Download All | |||||
| File Name/Size | DocType | Version | Access | License | ||
| Microbial removal of（412KB） | 开放获取 | License | View Download | |||
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment