Hydrophobic layered double hydroxides (LDHs): Selective adsorbents for liquid mixtures

I. Dékány, F. Berger, K. Imrik, G. Lagaly

Research output: Contribution to journalArticle

69 Citations (Scopus)

Abstract

The external and internal surface area of the calcium aluminum double hydroxide [Ca2Al(OH)6] NO3 · 2H2O were hydrophobized by the anionic surfactants sodium dodecylsulfate and sodium dodecylbenzene sulfonate. The adsorption behavior towards liquid mixtures (benzene/n-heptane and n-propanol/toluene) was studied by determining the surface excess adsorption isotherms, the heats of immersion in these liquids, and the basal spacing, i.e. the expansion of the interlayer space. Both hydrophobic layered double hydroxides (LDHs) adsorbed n-heptane, benzene, toluene, and n-propanol between the layers with considerable increase of the basal spacing. Interlamellar swelling of the hydrophobizised LDHs in n-heptane was fundamentally different to the behavior of hydrophobized 2:1 clay minerals (smectites, vermiculites). The surface excess isotherms for benzene/heptane mixtures were U-shaped and indicate preferential adsorption of benzene. Dodecylbenzene sulfonate double hydroxide preferentially adsorbed propanol from n-propanol/toluene mixtures but the dodecylsulfate derivative adsorbed both compounds.

Original languageEnglish
Pages (from-to)681-688
Number of pages8
JournalColloid & Polymer Science
Volume275
Issue number7
DOIs
Publication statusPublished - Jul 1997

Fingerprint

Hydroxides
1-Propanol
Heptane
Propanol
heptanes
Benzene
adsorbents
Adsorbents
hydroxides
Toluene
benzene
toluene
Liquids
liquids
sulfonates
adsorption
isotherms
Sodium
spacing
sodium

Keywords

  • Adsorption
  • Anionic surfactants
  • hydrophobic surfaces
  • layered double hydroxide
  • swelling

ASJC Scopus subject areas

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

Cite this

Hydrophobic layered double hydroxides (LDHs) : Selective adsorbents for liquid mixtures. / Dékány, I.; Berger, F.; Imrik, K.; Lagaly, G.

In: Colloid & Polymer Science, Vol. 275, No. 7, 07.1997, p. 681-688.

Research output: Contribution to journalArticle

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