Visible-light photocatalysis with phosphorus-doped titanium(IV) oxide particles prepared using a phosphide compound

Authors: Motoki Iwase, Keiji Yamada, Tsutomu Kurisaki, Orlando Omar Prieto-Mahaney, Bunsho Ohtani, Hisanobu Wakita

Abstract:
Doping titanium(IV) oxide(TiO₂) with phosphorus (P) having negative charges was attempted in order to obtain P-doped TiO₂ with a red shift of the absorption edge and visible-light photocatalytic activity. P-doped TiO₂ was synthesized through the hydrolysis of titanium tetraisopropoxide in a suspension containing phosphide. The P-doped TiO₂ nanoparticles exhibited a pale yellow color. The UV–vis diffuse reflection spectra of P-doped TiO₂, which was calcined at 450–600^◦C, showed a continuous and tailing absorption in the visible region. XRD patterns of P-doped TiO₂ showed the presence of anatase phase up to a temperature of 500^◦C and the appearance of rutile phase from a temperature over 550 ◦C. The red shift of the absorption edge was not associated with the phase transformation from anatase to rutile. The XPS P2p spectra of P-doped TiO₂ indicated the decrease of P⁵⁺ and the increase of P³⁻ during sputtering. The results suggested the presence of phosphate on the surface and the presence of P3− on the inner side of P-TiO₂. The action spectra of photocatalytic reaction for acetaldehyde decomposition revealed visible light activity of P-doped TiO₂. P-doped TiO₂ calcined at 475^◦C was the most active in degradation of phenol under visible light. The P-content was found to play a key role in determining the spectral response in visible area and the photocatalytic activity under visible light irradiation. 

Keywords:
Titania
Phosphorus
Photocatalysis
Phosphorus-doped titania
Phosphide

Published in: Applied Catalysis B: Environmental (Volumes 132–133, Pages 1-552, 27 March 2013)

Publisher: Elsevier  

ISSN Information: 0926-3373

Visible-light photocatalysis with phosphorus-doped titanium(IV) oxide particles prepared using a phosphide compound

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