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| Origin of Magnetism in Hydrothermally Aged 2-Line Ferrihydrite Suspensions | |
| Cao, L; Jiang, ZX; Du, YH; Yin, XM; Xi, SB; Wen, W; Roberts, AP; Wee, ATS; Xiong, YM; Liu, QS; Gao, XY | |
| 2017 | |
| Source Publication | ENVIRONMENTAL SCIENCE & TECHNOLOGY
 |
| ISSN | 0013-936X |
| Volume | 51Issue:5Pages:2643-2651 |
| Subtype | 期刊论文 |
| Abstract | As an iron oxyhydroxide, nanosized ferrihydrite (Fh) is important in Earth science, biology, and industrial applications. However, its basic structure and origin of its magnetism have long been debated. We integrate synchrotron-based techniques to explore the chemical structures of 2-line ferrihydrite and to determine the origin of its magnetism during hydrothermal aging in air. Our results demonstrate that both the magnetism and X-ray magnetic circular dichroism (XMCD) signal of 2-line ferrihydrite are enhanced with aging time, and that XMCD spectral patterns resemble that of maghemite (gamma-Fe2O3) rather than magnetite (Fe3O4). Fe L-edge and K-edge X-ray absorption spectroscopy (XAS) further indicate formation of both maghemite and hematite (alpha-Fe2O3) with increasing concentrations with longer hydrothermal aging time. Thus, magnetic enhancement with longer hydrothermal aging time is attributed to increasing maghemite concentration instead of a magnetically ordered ferrihydrite as previously reported. Moreover, L-edge and K-edge XAS spectra with different probing depths yield different ratios of these Fe oxides, which suggest the formation of a core (ferrihydrite-rich)-shell (with a mixture of both allotropes; alpha-Fe2O3 and gamma-Fe2O3) structure during hydrothermal aging. Our results provide insights into the chemical evolution of 2-line ferrihydrite that reveal unambiguously the origin of its magnetism. |
| DOI | 10.1021/acs.est.6b04716 |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000395963800020 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.sinap.ac.cn/handle/331007/27403 |
| Collection | 中科院上海应用物理研究所2011-2019年 |
| Recommended Citation GB/T 7714 | Cao, L,Jiang, ZX,Du, YH,et al. Origin of Magnetism in Hydrothermally Aged 2-Line Ferrihydrite Suspensions[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2017,51(5):2643-2651. |
| APA | Cao, L.,Jiang, ZX.,Du, YH.,Yin, XM.,Xi, SB.,...&Gao, XY.(2017).Origin of Magnetism in Hydrothermally Aged 2-Line Ferrihydrite Suspensions.ENVIRONMENTAL SCIENCE & TECHNOLOGY,51(5),2643-2651. |
| MLA | Cao, L,et al."Origin of Magnetism in Hydrothermally Aged 2-Line Ferrihydrite Suspensions".ENVIRONMENTAL SCIENCE & TECHNOLOGY 51.5(2017):2643-2651. |
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| Origin of Magnetism （1308KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Download | |
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