High UV/visible light activity of mixed phase titania: A generic mechanism

Synergistic effect of the mixed phase in titania photocatalyst on its performance compared to the pristine phases has been investigated in terms of the bulk and interfacial behavior of the phases in contact. The experiments were conducted under both UV and visible light irradiations. The photoactivi...

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Bibliographic Details
Published in:Solar energy materials and solar cells 2011-07, Vol.95 (7), p.1901-1907
Main Authors: NAIR, Ranjith. G, PAUL, Samrat, SAMDARSHI, S. K
Format: Article
Language:English
Subjects:
Anatase
Catalysis
Catalysts
Chemistry
Exact sciences and technology
General and physical chemistry
Irradiation
Light irradiation
Photochemistry
Physical chemistry of induced reactions (with radiations, particles and ultrasonics)
Rutile
Titanium dioxide
Wavelengths
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Summary:Synergistic effect of the mixed phase in titania photocatalyst on its performance compared to the pristine phases has been investigated in terms of the bulk and interfacial behavior of the phases in contact. The experiments were conducted under both UV and visible light irradiations. The photoactivity variation has been correlated with the changes in the ratio of anatase to rutile phases (A/R ratio), and their unique response to UV and visible radiations. For this, a set of pure (rutile or anatase) and mixed phases (with varying A/R ratio) titania nanoparticles were synthesized. The physico-chemical characterization was done using SEM, XRD, EDAX, UV-DRS, PL and FTIR analyses. The activity of catalysts in UV and visible light was investigated by monitoring the degradation of phenol. The results show that the mixed phase catalysts show enhanced photoactivity compared to pristine phases across the irradiation wavelength range. Further, the catalysts having a narrow range of high A/R ratio (>1) around 5.0 show high UV activity while those having low A/R ratio (
ISSN:0927-0248
1879-3398
DOI:10.1016/j.solmat.2011.02.017