fulltext.study @t Gmail

Improved visible light photocatalytic activity of TiO2 co-doped with Vanadium and Nitrogen

Paper ID Volume ID Publish Year Pages File Format Full-Text
46528 46441 2012 8 PDF Available
Title
Improved visible light photocatalytic activity of TiO2 co-doped with Vanadium and Nitrogen
Abstract

V- and N-codoped TiO2 photo-catalyst is synthesized by sol–gel method to sensitize TiO2 to visible light. The concentrations of V and N were varied and optimized to enhance photo-catalytic activity. In order to increase the active surface area, the crystalline powder was ball milled to obtain nanosized particles. The photo-catalysts were characterized by Micro-Raman, TEM, XPS and UV–vis (in diffused reflectance mode) techniques. The co-doped TiO2 photocatalyst displayed narrower band gap (2.3 eV) compared to singly doped TiO2 catalyst, namely V (2 at.%)-doped (2.42 eV), N (4 at.%)-doped (2.95 eV), and undoped TiO2 (3.13 eV). The photocatalytic activity for the degradation of Rhodamine B (an organic dye) under visible light irradiation obtained with co-doped TiO2 photo-catalyst is significantly better as compared to the undoped, V-doped, and N-doped TiO2. The incorporation of V and N in TiO2 lattice induces isolated energy levels near the conduction and valence bands, respectively, causing an effective narrowing of the band gap. In addition, due to the low dopants concentrations, these energy levels can also act as traps for photoexcited holes or electrons thus reducing the recombination between photo-generated charges. Both these effects, namely band narrowing and enhanced charge separation produce synergistic effects to increase the photocatalytic activity of V-N-codoped TiO2.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights▸ V-N-codoped TiO2 nano-photocatalyst with average size of 7 nm was synthesized. ▸ The TiO2 band gap was narrowed up to 2.3 eV when 2% of V and 4% of N are incorporated in TiO2. ▸ Increased visible light absorption and charge separation creates synergistic effect. ▸ Significantly higher photocatalytic activity was obtained with V-N-codoped-TiO2.

Keywords
Photocatalytic degradation; Rhodamine B; Codoping TiO2; Sol–gel method; Ball milling
First Page Preview
Improved visible light photocatalytic activity of TiO2 co-doped with Vanadium and Nitrogen
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 126, 25 September 2012, Pages 47–54
Authors
, , , ,
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