Surface complexation modeling of K+, NO3-, SO42-, Ca2+, F-, Co2+, and Cr3+ ion adsorption on silica gel

Márta Berka, István Bányai

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16 Citations (Scopus)

Abstract

Surface complex formation of K+, NO3-, SO42-, Ca2+, F-, Co2+, and Cr3+ ions was determined on the surface of silica gel. Experimental data obtained by acid-base titration of suspensions were interpreted in terms of the triple-layer model. The value of the deprotonation constant of surface OH could be determined precisely but the protonation constant was rather uncertain. The logarithms of ion pair formation constants for K+, NO3-, Ca2+, and SO42- adsorbed in the β-plane are log KipM,X∼0, therefore these species can be considered inert ions in the investigated pH range. F-, Co2+, and Cr3+ ions were found to be strongly sorbed in the o-plane. In order to provide a good fit and to obtain parameters independent of their initial values, all possible equilibrium must be accounted for in the models.

Original languageEnglish
Pages (from-to)131-135
Number of pages5
JournalJournal of colloid and interface science
Volume233
Issue number1
DOIs
Publication statusPublished - Jan 1 2001

Keywords

  • Silica gel
  • Surface complex formation
  • Triple-layer model

ASJC Scopus subject areas

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

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