Biogenic Formation and Growth of Uraninite (UO2).
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| Title: | Biogenic Formation and Growth of Uraninite (UO |
|---|---|
| Authors: | SEUNG YEOP LEE1 seungylee@kaeri.re.kr, MIN HOON BAIK1, JONG WON CHOI1 |
| Source: | Environmental Science & Technology. 11/15/2010, Vol. 44 Issue 22, p8409-8414. 6p. |
| Subject Terms: | Uraninite, Nanocrystals, Clustering of particles, Shewanella putrefaciens, Iron bacteria, Radioactive waste characterization, Environmental chemistry techniques, Transmission electron microscopy |
| Abstract: | Biogenic UO2 (uraninite) nanocrystals may be formed as a product of a microbial reduction process in uranium-enriched environments near the Earth's surface. We investigated the size, nanometer-scale structure, and aggregation state of UO2 formed by iron-reducing bacterium, Shewanella putrefacians CN32, from a uranium-rich solution. Characterization of biogenic UO2 precipitates by high-resolution transmission electron microscopy (HRTEM) revealed that the UO2 nanoparticles formed were highly aggregated by organic polymers. Nearly all of the nanocrystals were networked in more or less 100 nm diameter spherical aggregates that displayed some concentric UO2 accumulation with heterogeneríy. Interestingly, pure UO2 nanocrystals were piled on one another at several positions via UO2-UO2 interactions, which seem to be intimately related to a specific step in the process of growing large single crystals. In the process, calcium that was easily complexed with aqueous uranium(VI) appeared not to be combined with bioreduced uranium(IV), probably due to be lower binding energy. However, when phosphate was added to the system, calcium was found to be easily associated with uranium(IV), forming a new uranium phase, ningyoite. These results will extend the limited knowledge of microbial uraniferous mineralization and may provide new insights Into the fate of aqueous uranium complexes. [ABSTRACT FROM AUTHOR] |
| Copyright of Environmental Science & Technology is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | GreenFILE |
| FullText | Text: Availability: 0 |
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| Header | DbId: 8gh DbLabel: GreenFILE An: 57156855 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Biogenic Formation and Growth of Uraninite (UO<subscript>2</subscript>). – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22SEUNG+YEOP+LEE%22">SEUNG YEOP LEE</searchLink><relatesTo>1</relatesTo><i> seungylee@kaeri.re.kr</i><br /><searchLink fieldCode="AR" term="%22MIN+HOON+BAIK%22">MIN HOON BAIK</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22JONG+WON+CHOI%22">JONG WON CHOI</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Environmental+Science+%26+Technology%22">Environmental Science & Technology</searchLink>. 11/15/2010, Vol. 44 Issue 22, p8409-8414. 6p. – Name: Subject Label: Subject Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Uraninite%22">Uraninite</searchLink><br /><searchLink fieldCode="DE" term="%22Nanocrystals%22">Nanocrystals</searchLink><br /><searchLink fieldCode="DE" term="%22Clustering+of+particles%22">Clustering of particles</searchLink><br /><searchLink fieldCode="DE" term="%22Shewanella+putrefaciens%22">Shewanella putrefaciens</searchLink><br /><searchLink fieldCode="DE" term="%22Iron+bacteria%22">Iron bacteria</searchLink><br /><searchLink fieldCode="DE" term="%22Radioactive+waste+characterization%22">Radioactive waste characterization</searchLink><br /><searchLink fieldCode="DE" term="%22Environmental+chemistry+techniques%22">Environmental chemistry techniques</searchLink><br /><searchLink fieldCode="DE" term="%22Transmission+electron+microscopy%22">Transmission electron microscopy</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Biogenic UO2 (uraninite) nanocrystals may be formed as a product of a microbial reduction process in uranium-enriched environments near the Earth's surface. We investigated the size, nanometer-scale structure, and aggregation state of UO2 formed by iron-reducing bacterium, Shewanella putrefacians CN32, from a uranium-rich solution. Characterization of biogenic UO2 precipitates by high-resolution transmission electron microscopy (HRTEM) revealed that the UO2 nanoparticles formed were highly aggregated by organic polymers. Nearly all of the nanocrystals were networked in more or less 100 nm diameter spherical aggregates that displayed some concentric UO2 accumulation with heterogeneríy. Interestingly, pure UO2 nanocrystals were piled on one another at several positions via UO2-UO2 interactions, which seem to be intimately related to a specific step in the process of growing large single crystals. In the process, calcium that was easily complexed with aqueous uranium(VI) appeared not to be combined with bioreduced uranium(IV), probably due to be lower binding energy. However, when phosphate was added to the system, calcium was found to be easily associated with uranium(IV), forming a new uranium phase, ningyoite. These results will extend the limited knowledge of microbial uraniferous mineralization and may provide new insights Into the fate of aqueous uranium complexes. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Environmental Science & Technology is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1021/es101905m Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 6 StartPage: 8409 Subjects: – SubjectFull: Uraninite Type: general – SubjectFull: Nanocrystals Type: general – SubjectFull: Clustering of particles Type: general – SubjectFull: Shewanella putrefaciens Type: general – SubjectFull: Iron bacteria Type: general – SubjectFull: Radioactive waste characterization Type: general – SubjectFull: Environmental chemistry techniques Type: general – SubjectFull: Transmission electron microscopy Type: general Titles: – TitleFull: Biogenic Formation and Growth of Uraninite (UO2). Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: SEUNG YEOP LEE – PersonEntity: Name: NameFull: MIN HOON BAIK – PersonEntity: Name: NameFull: JONG WON CHOI IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 11 Text: 11/15/2010 Type: published Y: 2010 Identifiers: – Type: issn-print Value: 0013936X Numbering: – Type: volume Value: 44 – Type: issue Value: 22 Titles: – TitleFull: Environmental Science & Technology Type: main |
| ResultId | 1 |
