Chemical regeneration of magnesium oxide used as a sorbent for fluoride

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

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16 Citations (Scopus)

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

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Filtration and Separation

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