Indirect catalytic oxidation of multi-pollutants in diesel exhaust by ozone/micro-nano bubbles system

Jia, Nan; Ma, Mengdie; Wang, Xing; Wang, Xi; Ma, Jingyi; Li, Yongkuan; Li, Dengxin

doi:10.1080/09593330.2023.2174047

Cited by 1 publication

(1 citation statement)

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“…In addition, the ozone produced in plasmas containing oxygen sources has a relatively long lifetime ( Khuntia et al, 2021 ), and DBD plasma is among the most effective methods for generating ozone ( Kamel et al, 2018 ; Xia et al, 2022 ). Manganese oxides exhibit good catalytic activity in ozone oxidation, and the specific surface area of the catalyst and the valence distribution of the elements on the surface are important factors affecting the catalytic activity, which can be improved with better preparation processes or doping ( Gong et al, 2017 ; Jia et al, 2023 ).

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Section: Introductionmentioning

confidence: 99%

Synergistic graphene-MnOx/honeycomb activated carbon (G-MnOx/HAC) and plasma technology for eradication of pathogenic microorganisms

Zhang

Jia

et al. 2023

Front. Chem.

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This paper addresses the risk for environmental transmission of pathogenic microorganisms in confined spaces and the serious health hazards for personnel, and research on efficient eradication methods for the pathogenic microorganisms was carried out to provide technical support for ensuring the health of personnel in confined spaces. A series of graphene-MnO2 (G-MnO2) catalytic materials was prepared by hydrothermal and precipitation methods, and processing parameters such as the graphene doping method, the raw material ratio and the plasma action time were optimized. It was shown that G-MnOX-P/HAC prepared by a one-step precipitation method and with a graphene doping ratio of 10% had the best bactericidal effect in a dielectric barrier discharge (DBD) reactor after 4 min of reaction. The eradication rates for Escherichia coli (E. coli), Staphylococcus aureus (S. aureus), coronavirus and Aspergillus niger were all greater than 99.9%. The characterization techniques TEM, SEM, XRD, XPS, BET and FT-IR showed that the G-MnOX-P samples prepared by the one-step precipitation method had larger specific surface areas with more oxygen vacancies and functional groups on the surfaces, which was conducive to decomposition of the ozone generated by the dissociated plasma and formation of reactive oxygen species (ROS) for the microbial eradication process. Finally, by comparing the ozone-decomposition activity with the plasma co-catalytic performance, it was verified that efficient decomposition of the ozone facilitated the eradication of microorganisms. Based on this, an analysis of the mechanism for efficient eradication was carried out.

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