Degradation of pentachlorophenol in contaminated soil suspensions by potassium monopersulfate catalyzed oxidation by a supramolecular complex between tetra(p-sulfophenyl)porphineiron(III) and hydroxypropyl-β-cyclodextrin.

概要

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To enhance the catalytic oxidation of pentachlorophenol (PCP) in contaminated soil suspensions using tetra(p-sulfophenyl)porphineiron(III) (Fe(III)-TPPS) as a catalyst and potassium monopersulfate (KHSO5) as the single-oxygen donor, the effect of added hydroxypropyl-β-cyclodextrin (HP-β-CD) was examined. At pH 4 and 6, the percentage of PCP disappearance increased substantially in the presence of HP-β-CD. In addition, the self-degradation of Fe(III)-TPPS was significantly retarded in the presence of HP-β-CD. This retarded self-degradation can be attributed to the stabilization of Fe(III)-TPPS via the formation of a supramolecular complex with HP-β-CD. The kinetic constant for the self-degradation of Fe(III)-TPPS in the presence of HP-β-CD at pH 6 was much smaller than that at pH 4, indicating that Fe(III)-TPPS is more stable at pH 6. Thus, the amount of Fe(III)-TPPS, KHSO5 and HP-β-CD required to degrade PCP in contaminated soil suspensions was optimal at pH 6. When PCP-contaminated soil suspensions were treated under the optimized conditions, 12–18% and 24–28% of the PCP was mineralized to CO2 in the absence and presence of HP-β-CD, respectively. These results show that the presence of HP-β-CD in the Fe(III)-TPPS/KHSO5 catalytic system is effective in enhancing the degradation of PCP in contaminated soil suspensions.
Elsevier B.V.の論文
2007-06-01