Effects of pretreatment on physical and ion exchange properties of natural clinoptilolite

V. J. Inglezakis, C. D. Papadeas, M. D. Loizidou, H. P. Grigoropoulou

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


Four pretreatment procedures have been applied to natural clinoptilolite to establish the influence of the pretreatment process on the properties of the material under investigation. Modification of material properties is imposed for its use in wastewater treatment via ion exchange processes. Batch pretreatment procedures as well as continuous flow column have been studied by using sodium chloride, sodium hydroxide and nitric acid solutions in deionized water. Measurements of the effective capacity, the diffusion coefficient in the solid state and examination of the crystal structure have been employed to assess the effect of each specific pretreatment on the material under test. The effective capacity is improved in all cases, by a factor of 2.4 to 3.6, while the diffusion coefficient values depend strongly on the type of pretreatment used and fall in the range of 0.03−1.37×10−8 cm2s−2 at 20°C. The crystal structure remains unaltered as evidenced by XRD measurements.

Original languageEnglish
Pages (from-to)75-82
Number of pages8
JournalEnvironmental Technology (United Kingdom)
Issue number1
Publication statusPublished - 1 Jan 2001


  • diffusion coefficients
  • effective capacity
  • ion exchange
  • zeolites


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