Photocatalytic disinfection of E. coli using silver-doped TiO2 coated on cylindrical cordierite honeycomb monolith photoreactor under artificial sunlight irradiation
Document Type
Article
Publication Date
1-1-2023
Abstract
In this paper, TiO2 and Ag-doped TiO2 photocatalysts were coated on the cylindrical cordierite honeycomb monolith (CHM) to evaluate their photocatalytic disinfection against Escherichia coli (E. coli) bacteria under artificial sunlight irradiation. The X-ray diffraction (XRD) patterns showed a single-phase anatase structure for TiO2 samples calcined at 500 degrees C for 2 h. With the presence of Ag, the bandgap of TiO2 becomes narrower, and the absorption edge shifts toward the visible region. 6 mol% Ag-doped TiO2 (6Ag-T) showed a reduction of bandgap energy to 2.2 eV. TiO2 and Ag-doped TiO2 solutions were prepared and coated on the channels' surface of CHM for antibacterial applications. Although monolithic TiO2 caused a slight decrease in the number of alive E. coli, Ag dopant showed significant improvement in antibacterial properties. 6 mol% Ag-doped TiO2 coated on CHM (6Ag-T/S10/M) showed strong antibacterial effectiveness against E. coli that the bacterial cell concentration dropped to zero after 1 h of exposure. Impressively, reusability tests with these materials showed superior performance, where the antibacterial remains unchanged after five or seven successive operation cycles.
Keywords
E. coli, Ag-doped TiO2, Photocatalytic antibacterial, Cordierite honeycomb monolith
Divisions
nanocat
Funders
Viet Nam National University Ho Chi Minh City
Publication Title
Topics in Catalysis
Volume
66
Issue
1-4, S
Publisher
Springer
Publisher Location
233 SPRING ST, NEW YORK, NY 10013 USA