水中に低濃度で存在するクロロフェノール類の吸着剤を介した溶媒中への抽出とオゾン処理

概要

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The purpose of this study is to clarify the feasibility of a system in which chlorophenols (CPs) are concentrated from polluted water into an organic solvent by absorbent adsorption followed by ozone decomposition of the CPs in the solvent. CPs were decomposed in organic solvents by ozone with the highest first-order degradation rate constant in acetic acid. The rate constants in acetic acid were higher than those in distilled water for 2,4,5-TCP and 2,3,4,6-TeCP however, those in acetic acid were lower than those in distilled water for p-CP and 2,4-DCP. The Freundlich adsorption constant K of CPs on granular activated carbon (GAC) were 5 - 17 times higher than those on synthetic absorbents. While the percent desorption of CPs from GAC into acetic acid was only 13 - 42%, those of CPs from synthetic absorbents were more than 94%. The concentration ratios of CPs from water to acetic acid by GAC and synthetic absorbents were 5.5×106 - 5.0×1014 and 1.4×102 - 1.1×106, respectively. CPs could be concentrated from water to acetic acid efficiently using absorbents followed by desorption by acetic acid and decomposition by ozone.
2003-12-10