Investigation of surface structures by powder diffraction: a differential pair distribution function study on arsenate sorption on ferrihydrite

Differential pair distribution function (d-PDF) analysis of high energy powder X-ray diffraction data was carried out on 2-line ferrihydrite nanoparticles with arsenate oxyanions adsorbed on the surface to investigate the binding mechanism. In this analysis, a PDF of ferrihydrite is subtracted from...

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Veröffentlicht in:	Inorganic chemistry Jg. 49; H. 1; S. 325
Hauptverfasser:	Harrington, Richard, Hausner, Douglas B, Bhandari, Narayan, Strongin, Daniel R, Chapman, Karena W, Chupas, Peter J, Middlemiss, Derek S, Grey, Clare P, Parise, John B
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	United States 04.01.2010
ISSN:	1520-510X, 1520-510X
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Zusammenfassung:	Differential pair distribution function (d-PDF) analysis of high energy powder X-ray diffraction data was carried out on 2-line ferrihydrite nanoparticles with arsenate oxyanions adsorbed on the surface to investigate the binding mechanism. In this analysis, a PDF of ferrihydrite is subtracted from a PDF of ferrihydrite with arsenate sorbed on the surface, leaving only correlations from within the surface layer and between the surface and the particle. As-O and As-Fe correlations were observed at 1.68 and 3.29 A, respectively, in good agreement with previously published EXAFS data, confirming a bidentate binuclear binding mechanism. Further peaks are observed in the d-PDF which are not present in EXAFS, corresponding to correlations between As and O in the particle and As-2nd Fe.
Bibliographie:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1520-510X 1520-510X
DOI:	10.1021/ic9022695