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InVO4-sensitized TiO2 photocatalysts for efficient air purification with visible light

Paper ID Volume ID Publish Year Pages File Format Full-Text
27778 44042 2008 9 PDF Available
Title
InVO4-sensitized TiO2 photocatalysts for efficient air purification with visible light
Abstract

A visible-light-driven InVO4/TiO2 mesoporous photocatalyst was prepared by a sol–gel method. The catalyst was characterized by powder X-ray diffraction (XRD), nitrogen adsorption–desorption, transmission electron microscopy (TEM), UV-vis diffuse reflectance spectroscopy, X-ray photoelectron spectra (XPS), ultraviolet photoelectron spectra (UPS), and spin-trapping electron paramagnetic resonance (EPR). Photocatalytic activity of the sample was evaluated by the degradation of volatile organic compounds (VOCs) in air under visible light irradiation (450 nm ≤ λ ≤ 900 nm). Results revealed that the addition of InVO4 leaded to the visible light response up to ∼540 nm for InVO4/TiO2. Moreover, upon visible light irradiation, some superoxide radical anions, such as O2− and OH radicals, were generated on InVO4/TiO2, leading to the decomposition of VOCs. The high photocatalytic activity towards VOCs (e.g. benzene) was still maintained in the cycle experiments, and the turnover numbers recorded within 12 h work out to be 11.8 mol (produced CO2) and 6.2 mol (degraded C6H6) per mol catalyst. Deactivation of the photocatalyst was not observed during the cycle experiments. It has been confirmed that InVO4/TiO2 photocatalyst could be activated by visible light due to the existence of the InVO4. Based on the energy-band levels of InVO4 and TiO2, a photosensitization mechanism of InVO4/TiO2 is proposed.

Keywords
Photocatalysis; Visible light; Sensitization; InVO4/TiO2; Environmental purification
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InVO4-sensitized TiO2 photocatalysts for efficient air purification with visible light
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 193, Issues 2–3, 25 January 2008, Pages 213–221
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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