文摘
The development of a heterogeneous catalyst with high catalytic activity and durability for Hb>2b>Ob>2b>-mediated oxidation is one of the most important industrial and environmental issues. In this study, a Mn(II)-doped TiOb>2b> heterogeneous catalyst was developed for Hb>2b>Ob>2b>-mediated oxidation. The TiOb>2b> substrate-dependent partial-redox behavior of Mn was identified on the basis of our density functional theory simulations. This unique redox cycle was induced by a moderate electron transfer from Ti to Mn, which compensated for the electron loss of Mn and finally resulted in a high-efficiency cycling of Mn between its oxidized and reduced forms. In light of the theoretical results, a Mn(II)-doped TiOb>2b> composite with well-defined morphology and large surface area (153.3 m2 g–1) was elaborately fabricated through incorporating Mn(II) ions into a TiOb>2b> nanoflower, and further tested as the catalyst for oxidative degradation of organic pollutants in the presence of Hb>2b>Ob>2b>. Benefiting from the remarkable textural features and excellent Mn cycling property, this composite exhibited superior catalytic performance for organic pollutant degradation. Moreover, it could retain 98.40% of its initial activity even in the fifth cycle. Our study provides an effective strategy for designing heterogeneous catalytic systems for Hb>2b>Ob>2b>-mediated oxidations.