Applicability of simplified models for the estimation of ion exchange diffusion coefficients in zeolites

Vassilis J. Inglezakis, Helen P. Grigoropoulou

Research output: Contribution to journalArticlepeer-review

52 Citations (Scopus)

Abstract

The applicability of simplified models for the determination of ion exchange diffusion coefficients in zeolites is examined. The simplified models examined are Vermeulen's, Paterson's, and Nernst-Plank's approximations for isotopic and ion exchange processes, used in ion exchange systems analysis. Parameter analysis indicates the limits for fractional attainment of equilibrium U(t), the ratio of exchangeable ions in liquid to solid phase (w), and the ratio of surface diffusion coefficients of exchangeable ions (a), all clearly inter-related, within which the above-mentioned simplified models can be successfully used. Studies of the applicability of the isotopic exchange simplified models to experimental data for batch-type Na+-Pb2+ exchange clinoptilolite confirm the parameter analysis conducted.

Original languageEnglish
Pages (from-to)434-441
Number of pages8
JournalJournal of Colloid and Interface Science
Volume234
Issue number2
DOIs
Publication statusPublished - Feb 15 2001

Keywords

  • Clinoptilolite
  • Diffusion coefficients
  • Ion exchange

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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