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Photocatalysis/catalysis by innovative TiN and TiN-Ag surfaces inactivate bacteria under visible light

Paper ID Volume ID Publish Year Pages File Format Full-Text
46149 46430 2012 10 PDF Available
Title
Photocatalysis/catalysis by innovative TiN and TiN-Ag surfaces inactivate bacteria under visible light
Abstract

This study presents the design, preparation, testing and characterization of TiN and TiN-Ag nanoparticulate films leading to photocatalytic and catalytic inactivation of Escherichia coli. When Ti was sputtered in N2 atmosphere, the TiN films unexpectedly revealed semiconductor properties when irradiated under visible light due to the formation of TiO2 showing absorption in the visible spectral region. In TiN-Ag films, Ag enhances the photocatalytic activity of TiN leading to faster bacterial inactivation. Evidence for the presence of TiO2 and TiN in the films is presented by XPS. The TiN layers 50 nm thick sputtered by DC for 3 min led to complete inactivation of E. coli within 120 min. But TiN layers with a thickness >50 nm hinder the surface diffusion of charges reducing bacterial inactivation. The rate of TiN deposition was ∼1.4 × 1015 atoms TiN/cm2s. For the TiN-polyester samples under visible light a 3 log10 bacterial reduction (99.9%) was observed within 30 min while for TiN-Ag samples the same bacterial reduction was attained within ∼15 min. The absorption of the TiN-Ag samples in Kubelka–Munk (KM) units was directly proportional to the E. coli inactivation kinetics. TiN-Ag plasmon nanostructures are concurrently formed under low intensity visible light and accelerated bacterial inactivation. This study shows that TiN films have the potential to replace Ag-based disinfection materials leaching Ag into the environment.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights▸ When Ti was sputtered in N2 atmosphere, the TiN films revealed semiconductor properties. ▸ TiN layers 50 nm thick sputtered by DC for 3 min led to complete inactivation of E. coli within 120 min. ▸ The optical absorption of TiN-Ag films in Kubelka–Munk units was directly proportional to the E. coli inactivation kinetics. ▸ A TiN film has the potential to replace Ag-based disinfection films leaching Ag into the environment.

Keywords
TiN; E. coli inactivation; Polyester; Visible light; TiN-Ag sputtering DC and DCP
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 123–124, 23 July 2012, Pages 306–315
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us