fulltext.study @t Gmail

Surface properties and visible light activity of W-TiO2 photocatalysts prepared by surface impregnation and sol–gel method

Paper ID Volume ID Publish Year Pages File Format Full-Text
46388 46438 2012 9 PDF Available
Title
Surface properties and visible light activity of W-TiO2 photocatalysts prepared by surface impregnation and sol–gel method
Abstract

Preparation route of new tungsten-containing TiO2 powders (W-TiO2) and their activity under visible light are reported. The photocatalysts were prepared by the sol–gel method and by grinding anatase powder with a dopant precursor followed by calcinations (surface impregnation method). Tungsten oxide and tungsten hexacarbonyl were used as tungsten sources in both photocatalyst preparation procedure. The obtained photocatalysts were subsequently characterized by a BET method, X-ray photoelectron emission spectroscopy (XPS) and X-ray powder diffraction analysis (XRD). Degradation efficiency of phenol and formation of phenol degradation by-products were compared for two systems: W-doped TiO2 under visible light and P-25 under UV irradiation. The highest photoactivity under visible light was observed for 3%-W-TiO2 and it was three times higher than photoactivity of pure TiO2. Phenol oxidation in the presence of W-TiO2 and visible light leads to formation of hydroxyproduct (catechol) and phenol ring cleavage products (muconic aldehyde).

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► W-TiO2 powders showed higher photoactivity under visible light. ► The preparation method effect on photoactivity/surface properties was investigated. ► Different phenol degradation mechanism in the presence of W-TiO2/Vis was observed. ► Phenol oxidation under Vis light leads to formation of hydroxyproduct. ► The presence of OH radical in W-TiO2 system was confirmed by methanol oxidation.

Keywords
W-TiO2; Modified-TiO2; Doped-TiO2; Tungsten; Visible light photocatalysis; Heterogeneous photocatalysis
First Page Preview
Surface properties and visible light activity of W-TiO2 photocatalysts prepared by surface impregnation and sol–gel method
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 - Volumes 117–118, 18 May 2012, Pages 351–359
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