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Enhanced Visible-Light Photocatalytic Disinfection of Bacterial Spores by Palladium-Modified Nitrogen-Doped Titanium Oxide


  • N. Dudney—contributing editor

  • Supported by the Center of Advanced Materials for the Purification of Water with Systems, National Science Foundation, under Grant No. CTS-0120978. Characterization of fiber was carried out at the Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, which is partially supported by U.S. Department of Energy under grant DEFG02-91-ER45439.

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Palladium-modified nitrogen-doped titanium oxide (TiON/PdO) nanofibers were synthesized by a sol–gel process on activated carbon-coated glass fiber (ACGF) template. The TiON/PdO fiber was tested for visible-light-activated photocatalysis using Bacillus subtilis endospore as a target. Our work shows that TiON/PdO nanofibers display an effective antimicrobial effect on Bacillus spores. The palladium modification provides a strong enhancement over TiON in the photocatalytic disinfection. Microscopic characterization demonstrated that visible-light photocatalysis on TiON/PdO fiber caused drastic damage on the spore coat and internal structure.