Selective liquid adsorption and structural properties of montmorillonite and its hexadecylpyridinium derivatives

I. Dékány, F. Szántó, L. Nagy

Research output: Contribution to journalArticle

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Abstract

An X-ray diffraction method was used to study the structures of montmorillonites, the surfaces of which were covered to a systematically increasing extent with hexadecylpyridinium (HDP) cations. It was found that, depending on the degree of cover of the surface, the HDP cations form a mono- or bimolecular layer in the interlayer space. A detailed investigation was made of the selective sorption of binary mixtures on montmorillonite and on HDP-montmorillonites with different surface coverages. The adsorption excess isotherms were determined, as were the adsorption capacities from analysis of the isotherms, and also the equivalent specific surface areas. It was established that from benzene-n-heptane mixtures the benzene is adsorbed only on the external surface of montmorillonite, while in the case of organocomplexes it causes moderate disaggregation. From benzene, alcohols with different numbers of carbon atoms are also preferentially adsorbed on the internal surfaces of montmorillonite; with the rise in the number of carbon atoms, the extent of interlamellar adsorption decreases. In the case of HDP-montmorillonites in methanol-benzene mixtures, the adsorption capacity exhibits a monotonous increase with the degree of organopbility in the range under consideration. In the event of optimum organophility the disaggregation of the organocomplex is complete, and the equivalent specific surface area is 764-778 m2 · g-1. The swelling of the organocomplex, which can be characterized by X-ray diffraction measurement, is in close correlation with the interlamellar liquid adsorption. The results show modification of the surface of montmorillonite with HDP cations fundamentally determines the nature and extent of the selective liquid adsorption.

Original languageEnglish
Pages (from-to)150-160
Number of pages11
JournalColloid & Polymer Science
Volume256
Issue number2
DOIs
Publication statusPublished - Feb 1978

Fingerprint

Cetylpyridinium
Bentonite
montmorillonite
Clay minerals
Structural properties
Benzene
Derivatives
Adsorption
adsorption
Liquids
liquids
Cations
Positive ions
benzene
Specific surface area
Carbon
cations
X ray diffraction
Atoms
isotherms

ASJC Scopus subject areas

  • Polymers and Plastics
  • Materials Chemistry
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

Selective liquid adsorption and structural properties of montmorillonite and its hexadecylpyridinium derivatives. / Dékány, I.; Szántó, F.; Nagy, L.

In: Colloid & Polymer Science, Vol. 256, No. 2, 02.1978, p. 150-160.

Research output: Contribution to journalArticle

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