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Visible-light-driven photocatalytic inactivation of E. coli by Ag/AgX-CNTs (X = Cl, Br, I) plasmonic photocatalysts: Bacterial performance and deactivation mechanism

Paper ID Volume ID Publish Year Pages File Format Full-Text
45883 46426 2014 7 PDF Available
Title
Visible-light-driven photocatalytic inactivation of E. coli by Ag/AgX-CNTs (X = Cl, Br, I) plasmonic photocatalysts: Bacterial performance and deactivation mechanism
Abstract

•Photocatalytic inactivation of E. coli was studied using Ag/AgX-CNTs (X = Cl, Br, I).•Ag/AgBr-CNTs exhibits higher visible light photocatalytic efficient than others.•Photocatalytic bactericidal mechanism was investigated using various scavengers.•The stability and deactivation mechanism of Ag/AgX-CNTs were studied.

In this work, an effective photocatalytic inactivation of Escherichia coli K-12 was investigated using a series of synthesized Ag/AgX-CNTs (X = Cl, Br, I) composites as photocatalysts under visible light (VL) (λ ≥ 400 nm) irradiation. The results showed that the visible-light-driven (VLD) Ag/AgBr-CNTs could completely photocatalytically inactivate 1.5 × 107 cfu mL−1 of E. coli within 40 min, which was superior to Ag/AgCl-CNTs and Ag/AgI-CNTs. Moreover, photocatalytic bactericidal mechanism of the Ag/AgX-CNTs was investigated by using various scavengers to remove the respective reactive species and at different wavelengths of VL. It was found that photocatalytic inactivation of E. coli was much more efficient under VL with 435 nm wavelength and the photogenerated holes played an important role in this photocatalytic inactivation system. In addition, the stability and deactivation mechanism of Ag/AgX-CNTs photocatalysts during photocatalytic bacterial inactivation were also studied, and the results showed that the organic debris of decomposed bacteria may be absorbed on the active sites of the photocatalysts leading to the decrease of the photocatalytic activity.

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Keywords
Silver halides; Photocatalytic activity; Mechanism; Bacterial inactivation; Visible light
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Visible-light-driven photocatalytic inactivation of E. coli by Ag/AgX-CNTs (X = Cl, Br, I) plasmonic photocatalysts: Bacterial performance and deactivation mechanism
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 158–159, October 2014, Pages 301–307
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