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 language | English |
|---|---|
| Pages (from-to) | 681-688 |
| Number of pages | 8 |
| Journal | Colloid & Polymer Science |
| Volume | 275 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - Jul 1997 |
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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 journal › Article
}
TY - JOUR
T1 - Hydrophobic layered double hydroxides (LDHs)
T2 - Selective adsorbents for liquid mixtures
AU - Dékány, I.
AU - Berger, F.
AU - Imrik, K.
AU - Lagaly, G.
PY - 1997/7
Y1 - 1997/7
N2 - 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.
AB - 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.
KW - Adsorption
KW - Anionic surfactants
KW - hydrophobic surfaces
KW - layered double hydroxide
KW - swelling
UR - http://www.scopus.com/inward/record.url?scp=0344378461&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0344378461&partnerID=8YFLogxK
U2 - 10.1007/s003960050135
DO - 10.1007/s003960050135
M3 - Article
AN - SCOPUS:0344378461
VL - 275
SP - 681
EP - 688
JO - Kolloid Zeitschrift
JF - Kolloid Zeitschrift
SN - 0303-402X
IS - 7
ER -