(2)H and (27)Al Solid-State NMR Study of the Local Environments in Al-Doped 2-Line Ferrihydrite, Goethite, and Lepidocrocite

Chemistry of Materials : a Publication of the American Chemical Society
Jongsik KimClare P Grey

Abstract

Although substitution of aluminum into iron oxides and oxyhydroxides has been extensively studied, it is difficult to obtain accurate incorporation levels. Assessing the distribution of dopants within these materials has proven especially challenging because bulk analytical techniques cannot typically determine whether dopants are substituted directly into the bulk iron oxide or oxyhydroxide phase or if they form separate, minor phase impurities. These differences have important implications for the chemistry of these iron-containing materials, which are ubiquitous in the environment. In this work, (27)Al and (2)H NMR experiments are performed on series of Al-substituted goethite, lepidocrocite, and 2-line ferrihydrite in order to develop an NMR method to track Al substitution. The extent of Al substitution into the structural frameworks of each compound is quantified by comparing quantitative (27)Al MAS NMR results with those from elemental analysis. Magnetic measurements are performed for the goethite series to compare with NMR measurements. Static (27)Al spin-echo mapping experiments are used to probe the local environments around the Al substituents, providing clear evidence that they are incorporated into the bulk iron pha...Continue Reading

References

Aug 1, 1996·Risk Analysis : an Official Publication of the Society for Risk Analysis·D M Murphy, M E Paté-Cornell
Jan 27, 2005·Chemical Reviews·Clare P Grey, Nicolas Dupré
May 26, 2007·Science·F Marc MichelJohn B Parise
Feb 6, 2010·Proceedings of the National Academy of Sciences of the United States of America·F Marc MichelGordon E Brown

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Citations

Mar 4, 2017·Acta Crystallographica. Section C, Structural Chemistry·Jonathan F StebbinsAaron C Palke
Feb 22, 2018·Rapid Communications in Mass Spectrometry : RCM·Lydia PohlIngrid Kögel-Knabner
Jul 20, 2021·Chemistry of Materials : a Publication of the American Chemical Society·Euan N BasseyClare P Grey

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BETA
X-ray
NMR

Software Mentioned

CRYSTAL09

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