This work was to examine how the phase structure of various MnO2 affects their oxidative activity in contaminant degradation, using bisphenol A (BPA), a frequently detected contaminant in the environment, as a probe compound. Eight MnO2 with different phase structures, including α-, β-, δ-, λ-, and -MnO2, were successfully synthesized, characterized, and tested for BPA degradation in aqueous solution. The oxidative reactivity of MnO2 followed the order: δ-MnO2-1 &gt; δ-MnO2-2 &gt; α-MnO2-1 &gt; α-MnO2-2 &gt; -MnO2 &gt; λ-MnO2 &gt; -MnO2-2 &gt; -MnO2-1. Extensive characterization was then conducted to investigate their crystal structures (XRD, HRTEM), morphologies (SEM), surface areas (BET), conductivity (EIS), and surfaces (XPS). No correlation was observed between the oxidative reactivity and surface area, conductivity, reduction potential, or the content of surface oxygen species. However, the reactivity of MnO2 is highly positively correlated with the surface Mn(III) content and negatively correlated with the Mn oxidation state, indicating that the Mn(III) abundance plays an important role in the oxidative reactivity of the MnO2.

Effect of MnO2 phase structure on the oxidative reactivity toward bisphenol a degradation

256th National Meeting (2018)

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