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. 2023 Aug 2:11:1207947.
doi: 10.3389/fchem.2023.1207947. eCollection 2023.

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

Jiqing Zhang  1 , Ying Jia  1 , Xiaomeng Lv  1 , Tiedan Xiong  2 , Jun Su  1 , Yuanzheng Huang  1 , Keke Shen  1
Affiliations

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

Jiqing Zhang et al. Front Chem. .

Abstract

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.

Keywords: DBD plasma; G-MnOX-P/HAC; confined space; eradication; pathogenic microorganisms.

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Conflict of interest statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Figures

FIGURE 1
FIGURE 1
TEM image of (A, B) MnO2-H and (C, D) MnO2-P.
FIGURE 2
FIGURE 2
XRD pattern of the sample.
FIGURE 3
FIGURE 3
Valence distribution of Mn elements in sample.
FIGURE 4
FIGURE 4
(A) MnO2-H and (B) MnO2-P adsorption and desorption curves (inset shows pore size distribution).
FIGURE 5
FIGURE 5
XRD spectrum of 5% G-MnO2 sample.
FIGURE 6
FIGURE 6
XPS spectra of (A) C 1s (B) O 1s and (C) Mn 2p in 5%G-MnOx sample.
FIGURE 7
FIGURE 7
SEM image of G-MnO2 sample. (A) Electron image 1, (B) EDS layered image 1, (C) K Kα1, (D) C Kα1-2, (E) Mn Kα1, and , (F) O Kα1.
FIGURE 8
FIGURE 8
TEM image of G-MnO2 sample.
FIGURE 9
FIGURE 9
FT-IR spectrum of G-MnO2 sample.
FIGURE 10
FIGURE 10
Ozonolysis performance curves for different samples.
FIGURE 11
FIGURE 11
Mechanism of plasma synergistic G-MnOX-P/HAC for the eradication of pathogenic microorganisms.
See this image and copyright information in PMC

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