| DOI: | 10.2172/1323384
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| 报告号: | Scherer
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| 报告题名: | Electron transfer and atom exchange between aqueous Fe(II) and structural Fe(III) in clays. Role in U and Hg(II) transformations |
| 作者: | Scherer, Michelle
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| 出版年: | 2016
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| 发表日期: | 2016-08-31
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| 总页数: | 14
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| 国家: | 美国
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| 语种: | 英语
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| 英文关键词: | clay minerals
; iron
; electron transfer
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| 中文主题词: | 铁
; 矿物
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| 主题词: | IRON
; MINERALS
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| 英文摘要: | During this project, we investigated Fe electron transfer and atom exchange between aqueous Fe(II) and structural Fe(III) in clay minerals. We used selective chemical extractions, enriched Fe isotope tracer experiments, computational molecular modeling, and MĂśssbauer spectroscopy. Our findings indicate that structural Fe(III) in clay minerals is reduced by aqueous Fe(II) and that electron transfer occurs when Fe(II) is sorbed to either basal planes and edge OH-groups of clay mineral. Findings from highly enriched isotope experiments suggest that up to 30 % of the Fe atoms in the structure of some clay minerals exhanges with aqueous Fe(II). First principles calculations using a small polaron hopping approach suggest surprisingly fast electron mobility at room temperature in a nontronite clay mineral and are consistent with temperature dependent MĂśssbauer data Fast electron mobility suggests that electrons may be able to conduct through the mineral fast enough to enable exchange of Fe between the aqueous phase and clay mineral structure. over the time periods we observed. Our findings suggest that Fe in clay minerals is not as stable as previously thought. |
| URL: | http://www.osti.gov/scitech/servlets/purl/1323384
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| Citation statistics: |
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| 资源类型: | 研究报告
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/42029
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| Appears in Collections: | 过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响
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| 1323384.pdf（1014KB） | 研究报告 | -- | 开放获取 | | View
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| Recommended Citation: | |
Scherer, Michelle. Electron transfer and atom exchange between aqueous Fe(II) and structural Fe(III) in clays. Role in U and Hg(II) transformations. 2016-01-01.
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