Identification of Bernalite Transformation and Tridentate Arsenate Complex at Nano-goethite under Effects of Drying, pH and Surface Loading

Scientific Reports
Junho Han, Hee-Myong Ro

Abstract

The structural configuration of arsenate on iron (hydr)oxide determines its leachability and bioavailability in the soil environment. It is important to understand how the stability of iron hydroxide and the structural configuration of arsenate complexes vary in response to changes in environmental conditions. Therefore, we investigated the effects of drying, pH and surface loadings on the stability of goethite and the structural configuration of arsenate through batch experiments and TEM and XAS measurements with DFT calculation. As a result, we observed no significant transformation of goethite under most conditions, but TEM confirmed the partial formation of bernalite in the presence of arsenate at a pH of 10, and the bernalite showed 2.18 times higher arsenate sorption than the goethite. The linear combination fitting of the EXAFS spectra with DFT calculations revealed that tridentate and bidentate complexes were dominant under low surface loading and pH conditions in the sedimented samples, while monodentate complexes were abundant under high surface loading and pH conditions. Based on our results, we conclude that the formation of arsenic-rich colloids could account for mobilization in the soil environment, and the densit...Continue Reading

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Citations

Aug 10, 2018·Environmental Science and Pollution Research International·Junho Han, Hee-Myong Ro

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Methods Mentioned

BETA
X-ray
transmission electron spectroscopy
electron diffraction
transmission
transmission electron microscopy

Software Mentioned

CrysTBox
Demeter
FEFF8
R
Gaussian
Artemis
Athena
WinXAS
FEFF
SIXPACK

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