title: Enhancement of photocatalytic activity of P25 TiO2 by vanadium-ion implantation under visible light irradiation.
abstract: 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.
authors.affiliation: Department of Chemical and Biomolecular Engineering, Faculty of Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117576.
authors.forename: Jinkai
authors.initials: J
authors.lastname: Zhou
authors.forename: Masato
authors.initials: M
authors.lastname: Takeuchi
authors.forename: Ajay K
authors.initials: AK
authors.lastname: Ray
authors.forename: Masakazu
authors.initials: M
authors.lastname: Anpo
authors.forename: X S
authors.initials: XS
authors.lastname: Zhao