Cation-exchange properties of (Al + Na)-substituted synthetic tobermorites.

S. Komarneni, E. Breval, M. Miyake, R. Roy

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

In its natural form, tobermorite exhibits little or no exchange for alkali cations; synthetic tobermorites, however, exhibit reversible alkali cation exchange and selective caesium uptake upon a coupled substitution of (Al3+ + Na+) for Si4+. Substituted tobermorites were synthesized using aluminosilicate gels, NaOH and CaO, in Parr bombs at 175oC for 4 days. Unsubstituted tobermorite was synthesized using quartz and CaO in a Parr bomb at 175oC for 20 hr. Two (Al + Na)-substituted tobermorites showed c.e.c. of 77 and 71 me./100 g, whereas an unsubstituted tobermorite showed a c.e.c. of 12 me./100 g. The substituted tobermorites exhibited selective Cs exchange from either NaCl or CaCl2 solutions. For example, one substituted tobermorite showed a Cs-exchange coefficient (Kd) of 15 100, whereas unsubstituted tobermorite showed a Kd of only 90 from a 0.02 N CaCl2 solution containing 0.0002 moles/litre CsCl. Exchange isotherms for Na+ reverse= Cs+ showed that Cs+ is preferred over Na+ throughout the exchange in the (Al + Na)- substituted tobermorites. This group of cation exchangers is expected to find applications in radioactive waste disposal.-R.A.H.

Original languageEnglish
Pages (from-to)385-390
Number of pages6
JournalClays and Clay Minerals
Volume35
Issue number5
Publication statusPublished - 1987
Externally publishedYes

Fingerprint

parr
cation exchange
alkalis
Cations
ion exchange
cesium
waste disposal
quartz
aluminum
cations
gels
uptake mechanisms
Ion exchange
Alkalies
cation
tobermorite
Radioactive waste disposal
Cesium
Quartz
aluminosilicate

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Environmental Science(all)
  • Soil Science
  • Earth and Planetary Sciences (miscellaneous)
  • Geochemistry and Petrology
  • Water Science and Technology

Cite this

Komarneni, S., Breval, E., Miyake, M., & Roy, R. (1987). Cation-exchange properties of (Al + Na)-substituted synthetic tobermorites. Clays and Clay Minerals, 35(5), 385-390.

Cation-exchange properties of (Al + Na)-substituted synthetic tobermorites. / Komarneni, S.; Breval, E.; Miyake, M.; Roy, R.

In: Clays and Clay Minerals, Vol. 35, No. 5, 1987, p. 385-390.

Research output: Contribution to journalArticle

Komarneni, S, Breval, E, Miyake, M & Roy, R 1987, 'Cation-exchange properties of (Al + Na)-substituted synthetic tobermorites.', Clays and Clay Minerals, vol. 35, no. 5, pp. 385-390.
Komarneni, S. ; Breval, E. ; Miyake, M. ; Roy, R. / Cation-exchange properties of (Al + Na)-substituted synthetic tobermorites. In: Clays and Clay Minerals. 1987 ; Vol. 35, No. 5. pp. 385-390.
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AB - In its natural form, tobermorite exhibits little or no exchange for alkali cations; synthetic tobermorites, however, exhibit reversible alkali cation exchange and selective caesium uptake upon a coupled substitution of (Al3+ + Na+) for Si4+. Substituted tobermorites were synthesized using aluminosilicate gels, NaOH and CaO, in Parr bombs at 175oC for 4 days. Unsubstituted tobermorite was synthesized using quartz and CaO in a Parr bomb at 175oC for 20 hr. Two (Al + Na)-substituted tobermorites showed c.e.c. of 77 and 71 me./100 g, whereas an unsubstituted tobermorite showed a c.e.c. of 12 me./100 g. The substituted tobermorites exhibited selective Cs exchange from either NaCl or CaCl2 solutions. For example, one substituted tobermorite showed a Cs-exchange coefficient (Kd) of 15 100, whereas unsubstituted tobermorite showed a Kd of only 90 from a 0.02 N CaCl2 solution containing 0.0002 moles/litre CsCl. Exchange isotherms for Na+ reverse= Cs+ showed that Cs+ is preferred over Na+ throughout the exchange in the (Al + Na)- substituted tobermorites. This group of cation exchangers is expected to find applications in radioactive waste disposal.-R.A.H.

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