Chemical regeneration of magnesium oxide used as a sorbent for fluoride

Keiko Sasaki, Naoyuki Fukumoto, Sayo Moriyama, Qianqian Yu, Tsuyoshi Hirajima

Research output: Contribution to journalArticle

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Abstract

Use of MgO for repeated calcination with regard to its sorption density for F - and chemical stability was examined. Magnesium oxide was produced by the calcination of MgCO 3 at 1273 K for 1 h. The sorption of 9.82 mM F - on the calcined product and the calcinations of solid residues were carried out five times to evaluate trends in sorption density for F - and the stability of the chemically regenerated sorbents. The order of sorption density of F - (Q/mol g -1) apparently seems to depend on the specific surface area. However, Q′ values after normalization of the sorption density for the specific surface area (Q′/mmol m -2) were found to be correlated with the solid basicities of the calcined products which were derived from CO 2-TPD curves for the calcined products. The number of weak base sites, calculated from the peak intensity at 373 K in CO 2-TPD, was considered to be responsible for the removal of F - through hydration. Large quantities of NaMgF 3 and elemental Mg were evaporated by the calcination at 1273 K of the solid residues formed after sorption of F -.

Original languageEnglish
Pages (from-to)24-30
Number of pages7
JournalSeparation and Purification Technology
Volume98
DOIs
Publication statusPublished - Sep 19 2012

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Magnesium Oxide
Magnesia
Sorbents
Fluorides
Sorption
Calcination
Carbon Monoxide
Temperature programmed desorption
Specific surface area
Chemical stability
Alkalinity
Hydration

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Filtration and Separation

Cite this

Chemical regeneration of magnesium oxide used as a sorbent for fluoride. / Sasaki, Keiko; Fukumoto, Naoyuki; Moriyama, Sayo; Yu, Qianqian; Hirajima, Tsuyoshi.

In: Separation and Purification Technology, Vol. 98, 19.09.2012, p. 24-30.

Research output: Contribution to journalArticle

Sasaki, Keiko ; Fukumoto, Naoyuki ; Moriyama, Sayo ; Yu, Qianqian ; Hirajima, Tsuyoshi. / Chemical regeneration of magnesium oxide used as a sorbent for fluoride. In: Separation and Purification Technology. 2012 ; Vol. 98. pp. 24-30.
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