Partial-Redox-Promoted Mn Cycling of Mn(II)-Doped Heterogeneous Catalyst for Efficient H 2 O 2 -Mediated Oxidation

• Published in: ACS applied materials & interfaces 2017-01, Vol.9 (1), p.371-380
• Main Authors: Li, Hai-Tao, Gao, Qiang, Han, Bo, Ren, Zheng-Hui, Xia, Kai-Sheng, Zhou, Cheng-Gang
• Format: Article
• Language: English
• ISSN: 1944-8244; 1944-8252
• DOI: 10.1021/acsami.6b12445

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