Electrokinetic properties of clinoptilolite with mono- and multivalent electrolytes

Bahri Ersoy, Mehmet S. Çelik*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

113 Citations (Scopus)

Abstract

In this study, electrokinetic properties of clinoptilolite have been determined. A series of systematic zeta potential measurements have been performed to determine the isoelectric point (iep) and potential determining ions (pdi), and the effect of mono- and multivalent salts such as NH4Cl, CaCl2, Al(NO3)3 on the zeta potential of clinoptilolite. Clinoptilolite in water exhibits a negative surface charge and maintains this character even in very acidic conditions of pH 2-3. This reveals that clinoptilolite has no iep in the pH range of 2-12. H+ and OH- ions are the pdi for clinoptilolite. Excluding the trivalent Al3+ cations, monovalent and divalent cations are not able to reverse the surface sign of clinoptilolite. This is attributed to the ion exchange ability of clinoptilolite and the strong specific adsorption of the Al3+ counterions. A schematic adsorption model which accounts for the adsorption of mono- and multivalent ions in the electrical double layer of clinoptilolite is proposed.

Original languageEnglish
Pages (from-to)305-312
Number of pages8
JournalMicroporous and Mesoporous Materials
Volume55
Issue number3
DOIs
Publication statusPublished - 30 Sept 2002

Keywords

  • Adsorption
  • Clinoptilolite
  • Isoelectric point
  • Zeolite
  • Zeta potential

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