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Effect of Mo and V on the Hydrothermal Crystallization of Hematite from Ferrihydrite: An in Situ Energy Dispersive X-ray Diffraction and X-ray Absorption Spectroscopy Study

DOI: 10.1021/acs.cgd.5b00173 DOI Help

Authors: Loredana Brinza (University of Iasi) , Hong P. Vu (University of Melbourne) , Sam Shaw (University of Manchester) , Fred Mosselmans (Diamond Light Source) , Liane G Benning (University of Leeds)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Crystal Growth & Design , VOL 15 (10)

State: Published (Approved)
Published: August 2015

Open Access Open Access

Abstract: In this study we used in-situ synchrotron-based energy dispersive X-ray diffraction (EDXRD) to follow the transformation of ferrihydrite to hematite at pH ~ 8 and ionic strength between 0.1 and 0.7. In addition, the effects of co-precipitated molybdenum (Mo) and vanadium (V) on the transformation were evaluated both through EDXRD and X-ray absorption spectroscopy (XAS). The transformation end-product in all experiments was hematite with small amounts of goethite as an intermediate phase. XAS results revealed that Mo and V were initially adsorbed and co-precipitated onto/with ferrihydrite as molybdate and vanadate ions, respectively. After the ferrihydrite transformed to hematite these metals were sequestered into the hematite structure. The kinetic results showed that the presence of Mo and V in the ferrihydrite structure had little to no effect on the kinetics of the ferrihydrite transformation. The transformation however occurred ~ 30% faster at higher ionic strength.

Journal Keywords: Molybdenum Vanadium Hematite Crystallization

Subject Areas: Earth Science, Environment, Chemistry

Instruments: I18-Microfocus Spectroscopy

Other Facilities: SRS, Daresbury