Effect of pore clogging on kinetics of lead uptake by clinoptilolite

Vassilis J. Inglezakis, Napoleon A. Diamandis, Maria D. Loizidou, Helen P. Grigoropoulou

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

The kinetics of lead-sodium ion exchange using pretreated natural clinoptilolite are investigated, more specifically the influence of agitation (0, 210, and 650 rpm) on the limiting step of the overall process, for particle sizes of 0.63-0.8 and 0.8-1 mm at ambient temperature and initial lead solutions of 500 mg 1-1 without pH adjustment. The isotopic exchange model is found to fit the ion exchange process. Particle diffusion is shown to be the controlling step for both particle sizes under agitation, while in the absence of agitation film diffusion is shown to control. The ion exchange process effective diffusion coefficients are calculated and found to depend strongly on particle size in the case of agitation at 210 rpm and only slightly on particle size at 650 rpm. Lead uptake rates are higher for smaller particles only at rigorous agitation, while at mild agitation the results are reversed. These facts are due to partial clogging of the pores of the mineral during the grinding process. This is verified through comparison of lead uptake rates for two samples of the same particle size, one of which is rigorously washed for a certain time before being exposed to the ion exchange.

Original languageEnglish
Pages (from-to)54-57
Number of pages4
JournalJournal of Colloid and Interface Science
Volume215
Issue number1
DOIs
Publication statusPublished - Jul 1 1999
Externally publishedYes

Fingerprint

plugging
agitation
Ion exchange
Lead
Particle size
porosity
Kinetics
kinetics
ions
particle diffusion
Minerals
grinding
ambient temperature
Sodium
clinoptilolite
diffusion coefficient
adjusting
minerals
sodium

Keywords

  • Diffusion coefficients
  • Ion exchange
  • Lead uptake
  • Pore clogging
  • Zeolites

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry
  • Surfaces and Interfaces

Cite this

Effect of pore clogging on kinetics of lead uptake by clinoptilolite. / Inglezakis, Vassilis J.; Diamandis, Napoleon A.; Loizidou, Maria D.; Grigoropoulou, Helen P.

In: Journal of Colloid and Interface Science, Vol. 215, No. 1, 01.07.1999, p. 54-57.

Research output: Contribution to journalArticle

Inglezakis, Vassilis J. ; Diamandis, Napoleon A. ; Loizidou, Maria D. ; Grigoropoulou, Helen P. / Effect of pore clogging on kinetics of lead uptake by clinoptilolite. In: Journal of Colloid and Interface Science. 1999 ; Vol. 215, No. 1. pp. 54-57.
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