Modeling of ion exchange of Pb2+ in fixed beds of clinoptilolite

Vassilis J. Inglezakis, Helen P. Grigoropoulou

Research output: Contribution to journalArticle

65 Citations (Scopus)

Abstract

Ion exchange of Pb2+ on natural clinoptilolite in fixed bed and batch operations has been studied and simple models on experimental data have been applied. The operations are conducted at ambient temperature, an initial concentration of 0.01 N and at pH 4. Paterson's model is used to describe batch kinetics, the Langmuir isotherm is used to correlate equilibrium data and a solid diffusion controlled process is used to describe the fixed bed operation. The evaluated operating capacity is in the range of 0.21-1 meq/g and the diffusion coefficient is in the range of (0.07-5.4) × 10 -12 m2/s. The experimental results obtained put the basic theory under question. According to these experiments, the capacity and diffusion coefficient in fixed bed systems are flow dependent and different from those measured in the batch-reactor systems. This could be explained if the type of experimental setup influenced both the equilibrium isotherm and the system behavior.

Original languageEnglish
Pages (from-to)273-282
Number of pages10
JournalMicroporous and Mesoporous Materials
Volume61
Issue number1-3
DOIs
Publication statusPublished - Jul 18 2003
Externally publishedYes

Fingerprint

Isotherms
beds
Ion exchange
Diffusion in solids
isotherms
Batch reactors
diffusion coefficient
ions
ambient temperature
Kinetics
reactors
Experiments
kinetics
coefficients
Temperature
clinoptilolite

Keywords

  • Capacity
  • Diffusion coefficient
  • Fixed bed models
  • Ion exchange
  • Langmuir isotherm

ASJC Scopus subject areas

  • Catalysis
  • Materials Science(all)

Cite this

Modeling of ion exchange of Pb2+ in fixed beds of clinoptilolite. / Inglezakis, Vassilis J.; Grigoropoulou, Helen P.

In: Microporous and Mesoporous Materials, Vol. 61, No. 1-3, 18.07.2003, p. 273-282.

Research output: Contribution to journalArticle

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