Pyrene sorption in organic-layered double-metal hydroxides

Journal Article · Wed Jun 01 00:00:00 EDT 1994 · Langmuir; (United States)

DOI:https://doi.org/10.1021/la00018a039· OSTI ID:7242927

Dutta, P K; Robins, D S ^[1]

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1. 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), Vol. 10:6; ISSN 0743-7463
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
54 ENVIRONMENTAL SCIENCES
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
PYRENE
SORPTION
WATER POLLUTION
ALUMINIUM HYDROXIDES
CARBOXYLIC ACIDS
HEXANOIC ACID
HYDROXIDES
INFRARED SPECTRA
ION EXCHANGE
LITHIUM HYDROXIDES
MATHEMATICAL MODELS
METHANOL
SUCCINIC ACID
TETRADECANOIC ACID
WATER
X-RAY DIFFRACTION
ALCOHOLS
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
AROMATICS
COHERENT SCATTERING
CONDENSED AROMATICS
DICARBOXYLIC ACIDS
DIFFRACTION
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
LITHIUM COMPOUNDS
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
POLLUTION
SCATTERING
SPECTRA
400201* - Chemical & Physicochemical Properties
400105 - Separation Procedures
540320 - Environment
Aquatic- Chemicals Monitoring & Transport- (1990-)
400102 - Chemical & Spectral Procedures
990200 - Mathematics & Computers
540220 - Environment
Terrestrial- Chemicals Monitoring & Transport- (1990-)