Crystal Chemistry of Vanadium-Bearing Ellestadite Waste Forms

Yanan Fang; Sam J. Page; Gregory J. Rees; Maxim Avdeev; John V. Hanna; Tim J. White

doi:10.1021/acs.inorgchem.8b01160

Crystal Chemistry of Vanadium-Bearing Ellestadite Waste Forms

Yanan Fang^*, Sam J. Page, Gregory J. Rees, Maxim Avdeev, John V. Hanna, Tim J. White

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

Vanadate ellestadites Ca₁₀(SiO₄)_x(VO₄)_6-2x(SO₄)_xCl₂, serving as prototype crystalline matrices for the fixation of pentavalent toxic metals (V, Cr, As), were synthesized and characterized by powder X-ray and neutron diffraction (PXRD and PND), electron probe microanalysis (EPMA), Fourier transform infrared spectroscopy (FTIR), and solid-state nuclear magnetic resonance (SS-NMR). The ellestadites 0.19 < x < 3 adopt the P6₃/m structure, while the vanadate endmember Ca₁₀(VO₄)₆Cl₂ is triclinic with space group P1. A miscibility gap exists for 0.77 < x < 2.44. The deficiency of Cl in the structure leads to short-range disorder in the tunnel. Toxicity characteristic leaching testing (TCLP) showed the incorporation of vanadium increases ellestadite solubility, and defined a waste loading limit that should not exceed 25 atom % V to ensure small release levels.

Original language	English
Pages (from-to)	9122-9132
Number of pages	11
Journal	Inorganic Chemistry
Volume	57
Issue number	15
DOIs	https://doi.org/10.1021/acs.inorgchem.8b01160
Publication status	Published - Aug 6 2018
Externally published	Yes

Bibliographical note

Publisher Copyright:
Copyright © 2018 American Chemical Society.

ASJC Scopus Subject Areas

Physical and Theoretical Chemistry
Inorganic Chemistry

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title = "Crystal Chemistry of Vanadium-Bearing Ellestadite Waste Forms",

abstract = "Vanadate ellestadites Ca10(SiO4)x(VO4)6-2x(SO4)xCl2, serving as prototype crystalline matrices for the fixation of pentavalent toxic metals (V, Cr, As), were synthesized and characterized by powder X-ray and neutron diffraction (PXRD and PND), electron probe microanalysis (EPMA), Fourier transform infrared spectroscopy (FTIR), and solid-state nuclear magnetic resonance (SS-NMR). The ellestadites 0.19 < x < 3 adopt the P63/m structure, while the vanadate endmember Ca10(VO4)6Cl2 is triclinic with space group P1. A miscibility gap exists for 0.77 < x < 2.44. The deficiency of Cl in the structure leads to short-range disorder in the tunnel. Toxicity characteristic leaching testing (TCLP) showed the incorporation of vanadium increases ellestadite solubility, and defined a waste loading limit that should not exceed 25 atom % V to ensure small release levels.",

author = "Yanan Fang and Page, {Sam J.} and Rees, {Gregory J.} and Maxim Avdeev and Hanna, {John V.} and White, {Tim J.}",

note = "Publisher Copyright: Copyright {\textcopyright} 2018 American Chemical Society.",

year = "2018",

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doi = "10.1021/acs.inorgchem.8b01160",

language = "English",

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T1 - Crystal Chemistry of Vanadium-Bearing Ellestadite Waste Forms

AU - Fang, Yanan

AU - Page, Sam J.

AU - Rees, Gregory J.

AU - Avdeev, Maxim

AU - Hanna, John V.

AU - White, Tim J.

PY - 2018/8/6

Y1 - 2018/8/6

N2 - Vanadate ellestadites Ca10(SiO4)x(VO4)6-2x(SO4)xCl2, serving as prototype crystalline matrices for the fixation of pentavalent toxic metals (V, Cr, As), were synthesized and characterized by powder X-ray and neutron diffraction (PXRD and PND), electron probe microanalysis (EPMA), Fourier transform infrared spectroscopy (FTIR), and solid-state nuclear magnetic resonance (SS-NMR). The ellestadites 0.19 < x < 3 adopt the P63/m structure, while the vanadate endmember Ca10(VO4)6Cl2 is triclinic with space group P1. A miscibility gap exists for 0.77 < x < 2.44. The deficiency of Cl in the structure leads to short-range disorder in the tunnel. Toxicity characteristic leaching testing (TCLP) showed the incorporation of vanadium increases ellestadite solubility, and defined a waste loading limit that should not exceed 25 atom % V to ensure small release levels.

AB - Vanadate ellestadites Ca10(SiO4)x(VO4)6-2x(SO4)xCl2, serving as prototype crystalline matrices for the fixation of pentavalent toxic metals (V, Cr, As), were synthesized and characterized by powder X-ray and neutron diffraction (PXRD and PND), electron probe microanalysis (EPMA), Fourier transform infrared spectroscopy (FTIR), and solid-state nuclear magnetic resonance (SS-NMR). The ellestadites 0.19 < x < 3 adopt the P63/m structure, while the vanadate endmember Ca10(VO4)6Cl2 is triclinic with space group P1. A miscibility gap exists for 0.77 < x < 2.44. The deficiency of Cl in the structure leads to short-range disorder in the tunnel. Toxicity characteristic leaching testing (TCLP) showed the incorporation of vanadium increases ellestadite solubility, and defined a waste loading limit that should not exceed 25 atom % V to ensure small release levels.

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JO - Inorganic Chemistry

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ER -

Crystal Chemistry of Vanadium-Bearing Ellestadite Waste Forms

Abstract

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ASJC Scopus Subject Areas

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