Investigation of Surface Structures by Powder Diffraction: A Differential Pair Distribution Function Study on Arsenate Sorption on Ferrihydrite

被引：57

作者：

Harrington, Richard ^{[1
,4
]}

Hausner, Douglas B. ^{[2
]}

Bhandari, Narayan ^{[2
]}

Strongin, Daniel R. ^{[2
]}

Chapman, Karena W. ^{[3
]}

Chupas, Peter J. ^{[3
]}

Middlemiss, Derek S. ^{[4
]}

Grey, Clare P. ^{[4
]}

Parise, John B. ^{[1
,4
]}

机构：

[1] SUNY Stony Brook, Dept Geosci, Stony Brook, NY 11794 USA

[2] Temple Univ, Dept Chem, Philadelphia, PA 19122 USA

[3] Argonne Natl Lab, Adv Photon Source, Xray Sci Div, Argonne, IL 60439 USA

[4] SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA

来源：

INORGANIC CHEMISTRY | 2010年 / 49卷 / 01期

基金：

美国国家科学基金会;

关键词：

IRON-OXIDE MINERALS; HIGH-RESOLUTION; PRUSSIAN BLUE; ADSORPTION; CHEMISTRY; MECHANISM; KINETICS; EXAFS; NANOPARTICLES; COMPLEXATION;

D O I：

10.1021/ic9022695

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

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 angstrom, 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.

引用

页码：325 / 330

页数：6

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