This study aimed at fabricating iron oxide@Graphene composite (α-Fe2O3-x@Graphene@Mt) with superior conductivity and abundant oxygen vacancies to remove halogenated contaminant rapidly in peroxymonosulfate (PMS)-based system. We employed hydrolyzed iron-pillared montmorillonite/ tetracycline complex (FeOOH-Mt-TC) as precursor to prepare α-Fe2O3-x@Graphene@Mt through pyrolysis strategy under N2 atmosphere. During the pyrolysis process, the mutual effect between FeOOH and TC make α-Fe2O3-x@Graphene@Mt with superior conductivity, higher percent of Fe(II) and abundant oxygen vacancies,resulting in superior reactivity in activation of PMS for TBBPA decomposition. The apparent rate constant of TBBPA on α-Fe2O3-x@Graphene@Mt was 1.54 min-1. Meanwhile, superoxide radical played the leading role in the oxidation process when compared with hydroxyl radical, sulfate radical and singlet oxygen. In addition, the released Br- from TBBPA and the addition of alcohol led to the formation of reactive halogen and alcohol radicals, which also contributed to rapid removal of TBBPA through simultaneous reduction-oxidation process. This study not only provided a simple method to prepare excellent iron-based catalysts for PMS activation, but also promoted the application of reactive halogen and alcohol radicals in the treatment of halogenated organic pollutants through simultaneous reduction-oxidation process.

Rapid removal of tetrabromobisphenol A by α-Fe2O3-x @Graphene@montmorillonite catalyst with oxygen vacancies in peroxymonosulfate-based systems: Role of halogen and alcohol radicals

2019 Fall National Meeting

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