Reduction of iron(III) in annealed asbestos/chrysotile

Hiroshi Sakka, Takamitsu Kamikawa, Shiro Kubuki, Z. Homonnay, Katalin Sinkó, E. Kuzmann, Tetsuaki Nishida

Research output: Contribution to journalArticle

Abstract

Structural change of chrysotile caused by isothermal annealing and glassification was examined by 57Fe-Mössbauer spectroscopy, X-ray diffractometry (XRD), X-ray fluorescence analysis (XRF), differential thermal analysis (DTA) and scanning electron micrography (SEM). From 57Fe-Mössbauer spectra, it proved that FeII in the pristine chrysotile was oxidized to FeIII when annealed at 1,000°C. By contrast, FeIII was reduced into FeII when annealed at 1,300°C under in ambient atmosphere. Both forsterite (Mg 2SiO4) and fayalite ((Fe, Mg)2SiO4) were precipitated when the chrysotile was annealed at higher than 1,000°C. Homogeneous glass samples were obtained by melting asbestos with waste-glass powder, Na2CO3 and K2CO3 at 1,300°C for 15 min. A constant isomer shift value of 0.23 ±0.01 mm s∈-∈1 and an increase in the quadrupole splitting value from 0.70 ±0.02 to 1.01 ±0.02 mm s∈-∈1 were observed in the glassified chrysotile.

Original languageEnglish
Pages (from-to)161-166
Number of pages6
JournalHyperfine Interactions
Volume186
Issue number1-3
DOIs
Publication statusPublished - Sep 2008

Fingerprint

Serpentine Asbestos
asbestos
Asbestos
Iron
photomicrography
fayalite
iron
forsterite
glass
thermal analysis
x rays
isomers
quadrupoles
melting
atmospheres
Isothermal annealing
Glass
fluorescence
annealing
scanning

Keywords

  • Chrysotile
  • Detoxification
  • Waste glass

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Nuclear and High Energy Physics
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry

Cite this

Reduction of iron(III) in annealed asbestos/chrysotile. / Sakka, Hiroshi; Kamikawa, Takamitsu; Kubuki, Shiro; Homonnay, Z.; Sinkó, Katalin; Kuzmann, E.; Nishida, Tetsuaki.

In: Hyperfine Interactions, Vol. 186, No. 1-3, 09.2008, p. 161-166.

Research output: Contribution to journalArticle

Sakka, H, Kamikawa, T, Kubuki, S, Homonnay, Z, Sinkó, K, Kuzmann, E & Nishida, T 2008, 'Reduction of iron(III) in annealed asbestos/chrysotile', Hyperfine Interactions, vol. 186, no. 1-3, pp. 161-166. https://doi.org/10.1007/s10751-008-9848-9
Sakka, Hiroshi ; Kamikawa, Takamitsu ; Kubuki, Shiro ; Homonnay, Z. ; Sinkó, Katalin ; Kuzmann, E. ; Nishida, Tetsuaki. / Reduction of iron(III) in annealed asbestos/chrysotile. In: Hyperfine Interactions. 2008 ; Vol. 186, No. 1-3. pp. 161-166.
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