Removal of phthalic acid esters (PAEs) by the formation ot inclusion complexes withβ-cyclodextrin (β-CD) in aqueous solution was studied. According to the measurements of fluorescence and NMR spectroscopy, it was confirmed that PAEs wereincluded into theβ-CD cavity. The stability constants of the ,β-CDPAE complexes were varied depending on the alkyl chain length of the PAEs. The adsorption isotherms of PAEs andβ-CD polymer (β-CDP) were well described by Freundlich isotherm equations, and the adsorption capacity varied according to the stability constant. PAEs were well adsorbed byβ-CDP both in batch and in a column system, and the PAEs were also released fromβ-CDP by shaking with a mixture of methanol and water. The recoveryefficiency was varied with the mixture ratio of methanol and water, and the recoveredβ-CDP was reusable as an adsorbent.
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