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ZrNO–Ag co-sputtered surfaces leading to E. coli inactivation under actinic light: Evidence for the oligodynamic effect

Paper ID Volume ID Publish Year Pages File Format Full-Text
46214 46435 2013 9 PDF Available
Title
ZrNO–Ag co-sputtered surfaces leading to E. coli inactivation under actinic light: Evidence for the oligodynamic effect
Abstract

This study reports visible light sensitive ZrNO and ZrNO–Ag polyester samples prepared by sputtering in an Ar/N2/O2 atmosphere leading to Escherichia coli bacterial inactivation. The bacterial inactivation by ZrNO avoids the increasing environmental concern involving the fate of Ag-leaching of many disinfectants. The simultaneous co-sputtering of ZrNO and Ag2O enhanced the E. coli bacterial inactivation kinetics compared to the sequential sputtering of ZrNO and Ag. A reaction mechanism is suggested triggered by photoinduced interfacial charge transfer (IFCT) suggesting electron injection form the Ag2Ocb to the ZrO2cb. The sizes of the ZrO2 and Ag nanoparticles in the co-sputtered ZrNO–Ag were 80–130 nm and 8–15 nm respectively as determined by high angular annular dark field (HAADF) microscopy. Evidence is presented by X-ray photoelectron spectroscopy (XPS) for the self-cleaning of the photocatalysts after bacterial inactivation. This enabled a stable catalyst reuse. The XPS experimental spectra of ZrNO and ZrNO–Ag were deconvoluted into their ZrN, ZrNO and ZrO2 components. The amounts of Ag-ions released during bacterial inactivation were < 5 ppb/cm2 and well below the Ag cytotoxic levels. Since no cytotoxicity was introduced during the bacterial inactivation process, the ZrNO–Ag disinfection proceeds through an oligodynamic effect.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Mechanism of the visible light photoinduced electron injection of Ag- and Zr-species. ► Co-sputtered Ag/Zr is effective in redox processes leading to Escherichia coli inactivation. ► The high resolution microscopy/EDAX is provided.

Keywords
ZrNO sputtering; ZrNO–Ag co-sputtering; E. coli; Oligodynamic effect
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ZrNO–Ag co-sputtered surfaces leading to E. coli inactivation under actinic light: Evidence for the oligodynamic effect
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 138–139, 17 July 2013, Pages 113–121
Authors
, , , , , , , ,
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