Laws and mechanism of adsorption of cations by different ion-exchange forms of silica gel

S. Bárány, Vladimir Strelko

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Using radioactive tracer method, the regularities of adsorption of over 30 mono-, di- and trivalent cations including transition metal and lanthanide ions on the H, Ca- and Al-forms of silica gel are established. It has been shown that the affinity of cations of the same charge to the silica gel surface depends both on the nature of the adsorbing ion and the nature of exchangeable cation on the surface. Adsorption of alkali earth metal ions on the Ca-form of silica gel increases with a decrease of their radius i.e. an inversion of the sequence of adsorption compared to H- or Al-form of this adsorbent or polymeric cation-exchange resins takes place. For lanthanide ions the sequence of adsorption is the same for all ion-exchange forms of the silica gel studied, namely, an increase of adsorption with a decrease of their crystallographic radius, i.e. from La 3+ to Lu 3+ takes place. The laws observed are explained by taking into account the fact that adsorption of cations by silica gel is determined by both electrostatic interactions and additional covalent/donor-acceptor interactions between the surface and cations. The latter is due to formation of π-bonds between the electron pair in surface oxygen and vacant p-, d- or f-orbital of adsorbing cations.

Original languageEnglish
Pages (from-to)769-776
Number of pages8
JournalAdsorption
Volume19
Issue number2-4
DOIs
Publication statusPublished - 2013

Fingerprint

Silica Gel
Silica gel
silica gel
Cations
Ion exchange
Positive ions
Adsorption
cations
adsorption
Lanthanoid Series Elements
ions
Ions
Rare earth elements
metal ions
Cation Exchange Resins
Radioactive Tracers
Alkalies
Radioactive tracers
radii
Coulomb interactions

Keywords

  • Adsorption
  • H-, Ca-and Al-forms
  • Laws
  • Mechanism
  • Mono-, di- and trivalent cations
  • Radioactive tracers
  • Silica gel
  • Surface bonds

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Surfaces and Interfaces
  • Chemistry(all)

Cite this

Laws and mechanism of adsorption of cations by different ion-exchange forms of silica gel. / Bárány, S.; Strelko, Vladimir.

In: Adsorption, Vol. 19, No. 2-4, 2013, p. 769-776.

Research output: Contribution to journalArticle

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