Partial-Redox-Promoted Mn Cycling of Mn(II)-Doped Heterogeneous Catalyst for Efficient H₂O₂-Mediated Oxidation

Abstract

The development of a heterogeneous catalyst with high catalytic activity and durability for H 2 O 2 -mediated oxidation is one of the most important industrial and environmental issues. In this study, a Mn(II)-doped TiO 2 heterogeneous catalyst was developed for H 2 O 2 -mediated oxidation. The TiO 2 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 TiO 2 composite with well-defined morphology and large surface area (153.3 m 2 g –1 ) was elaborately fabricated through incorporating Mn(II) ions into a TiO 2 nanoflower, and further tested as the catalyst for oxidative degradation of organic pollutants in the presence of H 2 O 2 . 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 H 2 O 2 -mediated oxidations.