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Nanocomposite of Ag–AgBr–TiO2 as a photoactive and durable catalyst for degradation of volatile organic compounds in the gas phase

Paper ID Volume ID Publish Year Pages File Format Full-Text
46921 46453 2011 8 PDF Available
Title
Nanocomposite of Ag–AgBr–TiO2 as a photoactive and durable catalyst for degradation of volatile organic compounds in the gas phase
Abstract

The nanocomposites of Ag–AgBr–TiO2 photocatalyst have been prepared by a simple deposition–precipitation method, which is used for the gas-phase degradation of volatile organic pollutants of aromatic benzene and non-aromatic acetone that are notorious volatile organic compounds (VOCs) present in indoor and outdoor air. A collection of joint techniques, including X-ray diffraction (XRD), transmission electron microscopy (TEM) and ultraviolet/visible diffuse reflectance spectra (UV/vis DRS) have been employed to determine the structure, morphology and optical properties of the as-prepared Ag–AgBr–TiO2 nanocomposite. The presence of surface Ag species existed as Ag (0) and Ag (I) in Ag–AgBr–TiO2 is confirmed by the analysis of X-ray photoelectron spectroscopy (XPS). The Fourier transformed infrared spectroscopy (FT-IR) analysis shows the enhanced chemical bonding of O–Ti and O–Ti–O after the deposition of AgBr and Ag species onto the surface of TiO2. It is found that the Ag–AgBr–TiO2 nanocomposite exhibits much higher photocatalytic activity and stability under both UV light and visible light irradiation as compared with that over commercial titania (Degussa P25) toward the gas-phase degradation of both aromatic benzene and non-aromatic acetone. The active radical species involved for degradation reactions over the Ag–AgBr–TiO2 photocatalyst have been investigated by the spin-trapping electron paramagnetic resonance (EPR) spectra and the OH-trapping photoluminescence (PL) spectra. Synergetic effects between Ag–AgBr and TiO2 have been observed and discussed for the gas-phase degradation of volatile organic compounds on the basis of joint results of characterization and photocatalytic activity.

Graphical abstractAg–AgBr–TiO2 nanocomposites can be used as highly active and durable photocatalyst toward the gas-phase degradation of volatile organic pollutants of aromatic benzene and non-aromatic acetone that are notorious volatile organic compounds (VOCs) present in indoor and outdoor air. Synergetic effects between Ag–AgBr and TiO2 suggest that there is a wide scope to optimize the photocatalytic performance of Ag–AgX (X = Cl, Br and I) loaded onto different kinds of semiconductor supports. This in turn would advance the application of Ag–AgX-semiconductor nanocomposites as photocatalyst for the destruction of harmful or toxic VOCs in air that is of significant concern regarding environmental health.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Ag–AgBr–TiO2 nanocomposites as photoactive and durable photocatalyst for degradation of volatile organic compounds (VOCs), benzene and acetone, in the gas phase. ► Ag–AgBr–TiO2 exhibits enhanced activity and stability than bare TiO2 toward degradation of VOCs. ► Loading of a few amount of Ag–AgBr onto TiO2 offers a way to inhibit the deactivation of TiO2 toward degradation of VOCs.

Keywords
Photocatalytic degradation; Volatile organic compounds; Ag–AgBr–TiO2; Synergetic effect
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Nanocomposite of Ag–AgBr–TiO2 as a photoactive and durable catalyst for degradation of volatile organic compounds in the gas phase
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 106, Issues 3–4, 11 August 2011, Pages 445–452
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