Enhancement of photocatalytic activity of P25 TiO2 by vanadium-ion implantation under visible light irradiation

An ion-implantation method was used to prepare V-ion-implanted P25 TiO2 photocatalysts. Their photocatalytic activity for the degradation of formic acid under visible light irradiation (lambda>450 nm) was investigated. Upon implantation of V ions into the lattice of P25 TiO2, the photoactivity wa...

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Bibliographic Details
Published in:Journal of colloid and interface science 2007-07, Vol.311 (2), p.497-501
Main Authors: JINKAI ZHOU, TAKEUCHI, Masato, RAY, Ajay K, ANPO, Masakazu, ZHAO, X. S
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Photochemistry
Physical chemistry of induced reactions (with radiations, particles and ultrasonics)
Surface physical chemistry
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Summary:An ion-implantation method was used to prepare V-ion-implanted P25 TiO2 photocatalysts. Their photocatalytic activity for the degradation of formic acid under visible light irradiation (lambda>450 nm) was investigated. Upon implantation of V ions into the lattice of P25 TiO2, the photoactivity was remarkably enhanced. HRTEM images showed that the implanted V ions existed in the form of VO2(T) in the lattice of P25 TiO2. The intensity of photoluminescence (PL) spectra of V-ion-implanted P25 TiO2 decreased with the increase of the amount of implanted V ions, indicating the decrease of electron-hole pair recombination. It was also observed that the lower the PL intensity of V-ion-implanted P25 TiO2, the higher the photoactivity.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2007.03.007