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

Abstract 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, includin...

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Main Authors: Xinghao Wang, Jiaoqin Liu, Ruijuan Qu, Zunyao Wang, Qingguo Huang
Format: Article
Language:English
Published: Nature Publishing Group 2017-08-01
Series:Scientific Reports
Online Access:https://doi.org/10.1038/s41598-017-07913-2
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spelling doaj-9a72ea0da6ed443cb0b94da703f971d62020-12-08T01:43:51ZengNature Publishing GroupScientific Reports2045-23222017-08-017111010.1038/s41598-017-07913-2The laccase-like reactivity of manganese oxide nanomaterials for pollutant conversion: rate analysis and cyclic voltammetryXinghao Wang0Jiaoqin Liu1Ruijuan Qu2Zunyao Wang3Qingguo Huang4State Key Laboratory of Pollution Control and Resources Reuses, School of the Environment, Nanjing UniversityState Key Laboratory of Pollution Control and Resources Reuses, School of the Environment, Nanjing UniversityState Key Laboratory of Pollution Control and Resources Reuses, School of the Environment, Nanjing UniversityState Key Laboratory of Pollution Control and Resources Reuses, School of the Environment, Nanjing UniversityCollege of Agricultural and Environmental Sciences, Department of Crop and Soil Sciences, University of GeorgiaAbstract 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 α-, β-, γ-, δ-, and ɛ-MnO2, and Mn3O4, with 2,2′-azinobis-(3-ethylbenzthiazoline-6-sulfonate) (ABTS) and 17β-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 γ-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.https://doi.org/10.1038/s41598-017-07913-2
collection DOAJ
language English
format Article
sources DOAJ
author Xinghao Wang
Jiaoqin Liu
Ruijuan Qu
Zunyao Wang
Qingguo Huang
spellingShingle Xinghao Wang
Jiaoqin Liu
Ruijuan Qu
Zunyao Wang
Qingguo Huang
The laccase-like reactivity of manganese oxide nanomaterials for pollutant conversion: rate analysis and cyclic voltammetry
Scientific Reports
author_facet Xinghao Wang
Jiaoqin Liu
Ruijuan Qu
Zunyao Wang
Qingguo Huang
author_sort Xinghao Wang
title The laccase-like reactivity of manganese oxide nanomaterials for pollutant conversion: rate analysis and cyclic voltammetry
title_short The laccase-like reactivity of manganese oxide nanomaterials for pollutant conversion: rate analysis and cyclic voltammetry
title_full The laccase-like reactivity of manganese oxide nanomaterials for pollutant conversion: rate analysis and cyclic voltammetry
title_fullStr The laccase-like reactivity of manganese oxide nanomaterials for pollutant conversion: rate analysis and cyclic voltammetry
title_full_unstemmed The laccase-like reactivity of manganese oxide nanomaterials for pollutant conversion: rate analysis and cyclic voltammetry
title_sort laccase-like reactivity of manganese oxide nanomaterials for pollutant conversion: rate analysis and cyclic voltammetry
publisher Nature Publishing Group
series Scientific Reports
issn 2045-2322
publishDate 2017-08-01
description Abstract 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 α-, β-, γ-, δ-, and ɛ-MnO2, and Mn3O4, with 2,2′-azinobis-(3-ethylbenzthiazoline-6-sulfonate) (ABTS) and 17β-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 γ-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.
url https://doi.org/10.1038/s41598-017-07913-2
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