MOLECULAR INCLUSION PROPERTIES OF HYDROPHOBIC ORGANIC-COMPOUNDS BY A MODIFIED BETA-CYCLODEXTRIN INTERCALATED WITHIN A LAYERED DOUBLE HYDROXIDE

A study was conducted to evaluate the inclusion properties of various nonionic hydrophobic organic compounds by a novel intercalate derived from magnesium-aluminum layered double hydroxide (Mg/Al LDH) and carbo xymethyl-beta-cyclodextrin with a degree of substitution of 3 [CMCD(3) ]. The isotherm sorption results at 25 degrees C showed that the CMCD( 3)-Mg/Al LDH intercalate could retain all the organic compounds (trich loroethylene, tetrachloroethylene, benzene, toluene, p-, o-, m-xylene, ethylbenzene, 1,2,3-trichlorobenzene, naphthalene) studied and its so rption affinity for organic compounds was positively related to their hydrophobicities. The host-guest interaction was attributed to a parti tion process of the organic compounds into cyclodextrin cavities as we ll as intermolecular pores. A stereoselective interaction might also b e involved due to the intercalation of CMCD(3) within Mg/Al LDH interl ayers.