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DOI | 10.1021/acs.est.6b03913 |
X-ray Analyses of Lead Adsorption on the (001), (110), and (012) Hematite Surfaces | |
Noerpel, Matthew R.1,3; Lee, Sang Soo2; Lenhart, John J.1 | |
发表日期 | 2016-11-15 |
ISSN | 0013-936X |
卷号 | 50期号:22页码:12283-12291 |
英文摘要 | Predicting the environmental fate of lead relies on a detailed understanding of its coordination to mineral surfaces, which in turn reflects the innate reactivity of the mineral surface. In this research, we investigated fundamental dependencies in lead, adsorption to hematite by coupling extended X-ray absorption fine structure (EXAFS) spectroscopy on hematite particles (10 and 50 nm) with resonant anomalous X-ray reflectivity (RAXR) to single crystals expressing the (001), (012), or (110) crystallographic face. The EXAFS showed that lead adsorbed in a bidentate inner-sphere manner in both edge and corner sharing arrangements on the FeO6 octahedra for both particle sizes. The RAXR measurements confirmed these inner-sphere adsorption modes for all three hematite surfaces and additionally revealed outer-sphere adsorption modes not seen in the EXAFS. Lead uptake was larger and pH dependence was greater for the (012) and (110) surfaces, than the (001) surface, due to their expressing singly- and triply coordinated oxygen atoms the (001) surface lacks. In coupling these two techniques we provide a more detailed and nuanced picture of the coordination of lead to hematite while also providing fundamental insight into the reactivity of hematite. |
语种 | 英语 |
WOS记录号 | WOS:000388155000026 |
来源期刊 | ENVIRONMENTAL SCIENCE & TECHNOLOGY |
来源机构 | 美国环保署 |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/60389 |
作者单位 | 1.Ohio State Univ, Dept Civil Environm & Geodet Engn, Columbus, OH 43210 USA; 2.Argonne Natl Lab, Chem Sci & Engn Div, 9700 South Cass Ave, Argonne, IL 60439 USA; 3.US EPA, 5995 Ctr Hill Ave, Cincinnati, OH 45224 USA |
推荐引用方式 GB/T 7714 | Noerpel, Matthew R.,Lee, Sang Soo,Lenhart, John J.. X-ray Analyses of Lead Adsorption on the (001), (110), and (012) Hematite Surfaces[J]. 美国环保署,2016,50(22):12283-12291. |
APA | Noerpel, Matthew R.,Lee, Sang Soo,&Lenhart, John J..(2016).X-ray Analyses of Lead Adsorption on the (001), (110), and (012) Hematite Surfaces.ENVIRONMENTAL SCIENCE & TECHNOLOGY,50(22),12283-12291. |
MLA | Noerpel, Matthew R.,et al."X-ray Analyses of Lead Adsorption on the (001), (110), and (012) Hematite Surfaces".ENVIRONMENTAL SCIENCE & TECHNOLOGY 50.22(2016):12283-12291. |
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