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Supplementary Materials
The following are available online at https://www.mdpi.com/2073-4360/13/1/45/s1, Section S1–S5: Detailed methods and information; Figure S1. The schematic diagram of the image visualization using Xμ-CT; Figure S2. The procedure of bactericidal/bacteria removal efficiency test; Figure S3. Microscopic and FE-SEM images of filter webs from respirators after various treatments; Figure S4. Xµ-CT images of IPA-immersed and detergent-laundered filter webs; Figure S5. Energy dispersive spectroscopy (EDS) and elemental mapping for treated filter webs; Figure S6. Surface potential measurements of treated filter webs; Figure S7. %Bactericidal or bacteria removal efficiency of varied disinfection treatments; Table S1. Morphological characteristics of filter webs with varied disinfection treatments.
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Author Contributions
Experimental investigation: S.J., T.H., E.S., K.L., D.S., J.Y., J.K.; methodology: S.J., T.H., K.L., D.S., J.K.; computer modeling: K.L., D.S.; analysis of data: S.J., E.S., J.K.; conceptualization of study, funding acquisition, supervision of investigation: J.K. All authors have read and agreed to the published version of the manuscript.

Funding
This research was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF-2020R1F1A1074295).

Informed Consent Statement
Informed consent was obtained from all subjects involved in the study.

Data Availability Statement
The data presented in this study are available on request from the corresponding author.

Conflicts of Interest
The authors declare no conflict of interest.