The laccase-like reactivity of manganese oxide nanomaterials for pollutant conversion: rate analysis and cyclic voltammetry

作者：Wang, Xinghao; Liu, Jiaoqin; Qu, Ruijuan^*; Wang, Zunyao; Huang, Qingguo^*

来源：Scientific Reports, 2017, 7(1): 7756.

DOI：10.1038/s41598-017-07913-2

• OXYGEN REDUCTION REACTION
• WATER OXIDATION
• ORGANIC CONTAMINANTS
• TRANSFORMATION
• 17-BETA-ESTRADIOL
• PURIFICATION
• KINETICS
• GOLD
• MNO2
• GENERATION

Nanostructured manganese oxides, e.g. MnO2, have shown laccase-like catalytic activities, and are thus promising for pollutant oxidation in wastewater treatment. We have systematically compared the laccase-like reactivity of manganese oxide nanomaterials of different crystallinity, including alpha-, beta-, gamma-, delta-, and epsilon-MnO2, and Mn3O4, with 2,2'-azinobis-(3-ethylbenzthiazoline-6-sulfonate) (ABTS) and 17 beta-estradiol (E2) as the probing substrates. The reaction rate behaviors were examined with regard to substrate oxidation and oxygen reduction to evaluate the laccase-like catalysis of the materials, among which gamma-MnO2 exhibits the best performance. Cyclic voltammetry (CV) was employed to assess the six MnOx nanomaterials, and the results correlate well with their laccase-like catalytic activities. The findings help understand the mechanisms of and the factors controlling the laccase-like reactivity of different manganese oxides nanomaterials, and provide a basis for future design and application of MnOx-based catalysts.

• 出版日期2017-8-10
• 单位南京大学