Regulating Crystal Facets of MnO₂ for Enhancing Peroxymonosulfate Activation to Degrade Pollutants: Performance and Mechanism
Fu, J, Gao, P, Wang, L, Zhang, Y, Deng, Y, Huang, R, Zhao, Shuaifei, Yu, Z, Wei, Y, Wang, G and Zhou, S 2022, Regulating Crystal Facets of MnO₂ for Enhancing Peroxymonosulfate Activation to Degrade Pollutants: Performance and Mechanism, Catalysts, vol. 12, no. 3, pp. 1-18, doi: 10.3390/catal12030342.
Attached Files
Name
Description
MIMEType
Size
Downloads
Title
Regulating Crystal Facets of MnO₂ for Enhancing Peroxymonosulfate Activation to Degrade Pollutants: Performance and Mechanism
On the catalyst surface, crystal facets with different surface atom arrangements and diverse physicochemical properties lead to distinct catalytic activity. Acquiring a highly reactive facet through surface regulation is an efficient strategy to promote the oxidative decomposition of wastewater organic pollutants via peroxymonosulfate (PMS) activation. However, the mechanism through which crystal facets affect PMS activation is still unclear. In this study, three facet-engineered α-MnO2 with different exposed facets were prepared via a facile hydrothermal route. The prepared 310-MnO2 exhibited superior PMS activation performance to 100-MnO2 and 110-MnO2. Moreover, the 310-MnO2/PMS oxidative system was active over a wide pH range and highly resistant to interfering substances from wastewater. These advantages of the 310-MnO2/PMS system make it highly promising for practical wastewater treatment. Based on quenching experiments, electron paramagnetic resonance (EPR) analysis, solvent exchange, and electrochemical measurements, mediated electron transfer was found to be the dominant nonradical pathway for p-chloroaniline (PCA) degradation. A sulfhydryl group (-SH) masking experiment showed that the highly exposed Mn atoms on the 310-MnO2 surface were sites of PMS activation. In addition, density functional theory (DFT) calculations confirmed that the dominant {310} facet promoted adsorption/activation of PMS, which favored the formation of more metastable complexes on the α-MnO2 surface. The reaction mechanism obtained here clarifies the relationship between PMS activation and crystal facets. This study provides significant insights into the rational design of high-performance catalysts for efficient water remediation
Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved.
Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO.
If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.
Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.
orcid.org/0000-0002-7727-6676
Cited 
Cited 