Abstract
Manganese oxides are among the strongest oxidants in the natural environment, which have been found to induce the degradation of tetrabromobisphenol A (TBBPA), a typical persistent organic pollutant; however, the underlying mechanisms are not fully understood. Herein, we studied the degradation of TBBPA by three types of MnO2 nanoparticles under ambient dark conditions, paying particular attention to the role of reactive oxygen species in the degradation of TBBPA. Superoxide radical (O2•-) was produced by all the MnO2 under ambient dark conditions, whereas hydroxyl radical and singlet oxygen were undetectable. The reactivities of MnO2 towards TBBPA followed the order of δ-MnO2 > γ-MnO2 > β-MnO2, and were positively correlated to the contents of surface Mn(III) and their capacities to produce O2•-. Quenching of O2•- by superoxide dismutase confirmed that about 70% of TBBPA removed by δ-MnO2 was attributed to O2•-. This study unveils the dominant role of O2•--mediated pathway for the degradation of TBBPA by MnO2 under ambient dark conditions. The results expanded our understanding of the mechanism of organic pollutants degradation by Mn oxides in natural environment.
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