Catalytic oxidation of tetrabromobisphenol A by iron(III)-tetrakis(p-sulfonatephenyl)porphyrin catalyst supported on cyclodextrin polymers with potassium monopersulfate

• A water-soluble FeTPPS catalyst was loaded to CDPs by forming inclusion complexes.
• FeTPPS/CDPs showed catalytic activities for oxidative degradation of TBBPA.
• Higher reusability and suppression of inhibition by HA were found in FeTPPS/γ-CDP.
• Level of the loaded FeTPPS to γ-CDP was much larger than those to α- and β-CDPs.

A water-soluble iron(III)-tetrakis(p-sulfonatephenyl)porphyrin (FeTPPS) complex was loaded on cyclodextrin polymers (CDPs) by forming inclusion complexes. The amount of the loaded FeTPPS for γ-CDP was much larger than the corresponding values for α- and β-CDPs. All of the prepared FeTPPS/CDPs showed catalytic activities for the oxidative degradation of TBBPA at pH 8. Although the turnover frequency (TOF) value for the FeTPPS/α-CDP catalyst was the largest among all the catalysts tested, the FeTPPS/γ-CDP catalyst was inhibited less in the presence of humic acid, which is a major component of landfill leachates. During a 4-h incubation period, 4–8% of the loaded FeTPPS was eluted from the FeTPPS/CDP catalysts, and their efficiencies for the degradation of TBBPA and debromination decreased with increasing recycle times for FeTPPS/α-CDP and FeTPPS/β-CDP. However, the decreases in efficiency for the oxidation of TBBPA were smaller in the case of the FeTPPS/γ-CDP catalyst. In conclusion, the FeTPPS/γ-CDP catalyst performed at a much higher level compared to the FeTPPS/α-CDP and FeTPPS/β-CDP catalysts, in terms of inhibition by coexisting substances and reusability.

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