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Facile template synthesis of dumbbell-like Mn2O3 with oxygen vacancies for efficient degradation of organic pollutants by activating peroxymonosulfate

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Abstract

In this work, novel dumbbell-like Mn2O3 was prepared using a low-cost and environmentally friendly template (gelatin) and applied to activate peroxymonosulfate (PMS) for pollutant degradation. The characterization results showed that dumbbell-like microstructures were formed by the self-assembly of tiny nanoparticles. Mn2O3-G (gelatin as the template) as a heterogeneous catalyst for PMS activation could effectively degrade various pollutants and exhibited an excellent degradation rate of rhodamine B (0.2333 min−1, in 30 min) for PMS activation compared to Mn2O3-C (carboxymethyl cellulose as the template), Mn2O3-N (without a template), and MnO2. The superior catalytic performance of Mn2O3-G was ascribed to its high oxygen vacancy content. The radical scavenging and EPR experiments revealed that SO4˙, OH˙, O2˙, and 1O2 were identified as reactive species generated from PMS activation. The oxygen vacancies participated in the generation of the reactive species. Thus, a facile and environmentally friendly method is provided for the synthesis of dumbbell-like Mn2O3 as a high-efficiency catalyst for PMS activation. Furthermore, this study shows a new mechanistic insight into PMS activation on Mn2O3.

Graphical abstract: Facile template synthesis of dumbbell-like Mn2O3 with oxygen vacancies for efficient degradation of organic pollutants by activating peroxymonosulfate

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Article information


Submitted
11 Sep 2019
Accepted
28 Dec 2019
First published
04 Jan 2020

Catal. Sci. Technol., 2020, Advance Article
Article type
Paper

Facile template synthesis of dumbbell-like Mn2O3 with oxygen vacancies for efficient degradation of organic pollutants by activating peroxymonosulfate

Y. Li, D. Li, S. Fan, T. Yang and Q. Zhou, Catal. Sci. Technol., 2020, Advance Article , DOI: 10.1039/C9CY01849B

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