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

摘要

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 gamma-CDP was much larger than the corresponding values for alpha- and beta-CDP5. 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/alpha-CDP catalyst was the largest among all the catalysts tested, the FeTPPS/gamma-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/alpha-CDP and FeTPPS/beta-CDP. However, the decreases in efficiency for the oxidation of TBBPA were smaller in the case of the FeTPPS/gamma-CDP catalyst. In conclusion, the FeTPPS/gamma-CDP catalyst performed at a much higher level compared to the FeTPPS/alpha-CDP and FeTPPS/beta-CDP catalysts, in terms of inhibition by coexisting substances and reusability. (C) 2015 Elsevier B.V. All rights reserved.