Pyrene sorption in organic-layered double-metal hydroxides
- Ohio State Univ., Columbus, OH (United States)
Myristic, hexanoic, and succinic acids were incorporated into a lithium- and aluminum-containing layered double-metal hydroxide (LDH), resulting in materials with interlayer spacings of 21.6, 17.8, and 7.5 [angstrom], respectively. Comparison of these spacings with the dimensions of the all-trans form of the acid molecules indicates an interlayer monolayer arrangement for myristic and succinic acids, and a bilayer arrangement for hexanoic acid. Sorption isotherms of pyrene by these organic-exchange LDH's were carried out in methanol/water mixtures, because of the limited solubility of pyrene in water. Using cosolvent theory, partition coefficients (log K[sub oc]) for pyrene into myristic acid-LiAl-LDH and hexanoic acid-LiAl-LDH were determined to be 4.38 and 3.44, respectively. No sorption of pyrene was observed in succinic acid-LiAl-LDH, suggesting that partitioning into the interlayer space was controlled by the width of the interlayer spacings. Infrared studies showed distortion of the acid chain packing upon incorporation of pyrene into hexanoic acid-LiAl-LDH. The conclusions of this study are that organic-exchanged LDH's exhibit novel sieving effects toward hydrophobic compounds based on interlayer spacings, and that the interlayer packing of the alkyl chains influences the extent of sorption. 33 refs., 7 figs., 1 tab.
- DOE Contract Number:
- FG02-90ER14105
- OSTI ID:
- 7242927
- Journal Information:
- Langmuir; (United States), Journal Name: Langmuir; (United States) Vol. 10:6; ISSN LANGD5; ISSN 0743-7463
- Country of Publication:
- United States
- Language:
- English
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Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
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99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
ALCOHOLS
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM HYDROXIDES
AROMATICS
CARBOXYLIC ACIDS
COHERENT SCATTERING
CONDENSED AROMATICS
DICARBOXYLIC ACIDS
DIFFRACTION
HEXANOIC ACID
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXIDES
HYDROXY COMPOUNDS
INFRARED SPECTRA
ION EXCHANGE
LITHIUM COMPOUNDS
LITHIUM HYDROXIDES
MATHEMATICAL MODELS
METHANOL
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
POLLUTION
PYRENE
SCATTERING
SORPTION
SPECTRA
SUCCINIC ACID
TETRADECANOIC ACID
WATER
WATER POLLUTION
X-RAY DIFFRACTION