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Vanadia–titania thin films for photocatalytic degradation of formaldehyde in sunlight

Paper ID Volume ID Publish Year Pages File Format Full-Text
42142 45912 2010 7 PDF Available
Title
Vanadia–titania thin films for photocatalytic degradation of formaldehyde in sunlight
Abstract

Thin films of vanadia–titania with good adhesion to the substrates have been deposited on various substrates such as glass slides, glass helix and silica raschig rings by simple sol–gel dip coating process using vanadium and titanium peroxide gel. The optimum concentration of vanadia in titania for obtaining good uniform viscous gel was found to be 0.5–4 wt% beyond which the vanadia particles disturb the gel network, resulting in the formation of a gelatinous precipitate. The films of vanadia–titania as well as the dried powder of the bulk gel were characterized by different characterization techniques. Optical characterization by UV–vis spectrophotometer showed a shift in optical absorption wavelength to the visible region that may be due to the incorporation of vanadia into titania structure. The XRD revealed the formation of anatase phase in pure titania as well as titania with up to 2% vanadia loading, whereas formation of rutile as minor phase along with anatase as major phase was observed at higher vanadia loading. The XRD did not show any peaks of vanadia phase up to 5% vanadia loading indicating either incorporation of vanadia into titania structure or high dispersion of amorphous vanadia on titania support. The pure and vanadia doped TiO2 thin films were evaluated for their photocatalytic activity for degradation of methylene blue as a model pollutant under sunlight. Doping of V2O5 in TiO2 showed an increase in the photo-degradation rate of methylene blue by a factor of 3–6.6 times compared to pure TiO2. The highest rate has been obtained for 4% V2O5-doped TiO2 films. Vanadia doped TiO2 thin films were also found to be very active for photocatalytic degradation of formaldehyde from aqueous solution in sunlight.

Graphical abstractThin films of vanadia–titania with good adhesion to the substrates have been deposited on various substrates by simple sol–gel dip coating using peroxide gel. The V2O5/TiO2 thin films showed very high photocatalytic activity in sunlight for degradation of methylene blue as model dye and degradation of formaldehyde from aqueous solution as an industrial pollutant.Figure optionsDownload full-size imageDownload high-quality image (119 K)Download as PowerPoint slide

Keywords
Photocatalysis; Sunlight; V2O5/TiO2; Thin films; Methylene blue; Formaldehyde
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Vanadia–titania thin films for photocatalytic degradation of formaldehyde in sunlight
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 374, Issues 1–2, 1 February 2010, Pages 103–109
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