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Silver-modified titania with enhanced photocatalytic and antimicrobial properties under UV and visible light irradiation

Paper ID Volume ID Publish Year Pages File Format Full-Text
53861 46987 2015 7 PDF Available
Title
Silver-modified titania with enhanced photocatalytic and antimicrobial properties under UV and visible light irradiation
Abstract

•Ag@TiO2-active decomposition of methanol, acetic acid, 2-propanol and Escherichia coli.•Possible electron storage in Ag nanoparticles hinders charge recombination.•Plasmon resonance is responsible for photocatalytic activity under visible light.•Mineralization of bacteria cells was achieved under UV and visible light.•Mechanism study by action spectra and time-resolved microwave conductivity methods.

Commercial titania photocatalysts were modified with 2 wt% of silver by photodeposition. The properties of the samples were characterized by DRS, XPS, XRD, FE-SEM and STEM. The modified samples exhibited activity under visible light and enhanced activity under UV irradiation for 2-propanol and acetic acid oxidation, respectively. The time-resolved microwave conductivity (TRMC) analysis indicated that enhanced activity (2.5–8-fold enhancement depending on titania) under UV irradiation was caused by an electron storage in metallic nanoparticles (NPs), and therefore decreasing the recombination between charge carriers. The action spectrum (AS) analysis proved that localized surface plasmon resonance (LSPR) of silver NPs induced the photocatalytic activity under visible light irradiation. The increase of antimicrobial properties under visible light irradiation indicated that not only intrinsic properties of silver in the dark, but also plasmonic properties of Ag@TiO2 were responsible for overall bacteria killing. The evolution of carbon dioxide under both irradiation ranges indicated mineralization of bacteria cells, and therefore possible application of silver-modified titania for decomposition of chemical and biological pollutants.

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Keywords
Plasmonic photocatalysts; Silver nanoparticles; Action spectra; Time-resolved microwave conductivity; Antimicrobial properties
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Silver-modified titania with enhanced photocatalytic and antimicrobial properties under UV and visible light irradiation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 252, 1 September 2015, Pages 136–142
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