Details

Autor(en) / Beteiligte

• Primo, Ana
• Corma, Avelino
• García, Hermenegildo

Titel

Titania supported gold nanoparticles as photocatalyst

Ist Teil von

• Physical chemistry chemical physics : PCCP, 2011-01, Vol.13 (3), p.886-91

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2011

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• This Perspective is focused on the photocatalytic activity of gold nanoparticles supported on titania (Au/TiO 2 ). Titania is the most widely used photocatalyst, but its limited activity under visible light irradiation has motivated the quest for modified titania materials absorbing visible light. The review starts by justifying how doping with metallic elements is a related strategy, but different, to that leading to the use of Au/TiO 2 in photocatalysis. Data supporting and confirming the photoactivity of gold nanoparticles in colloidal solutions are briefly presented to justify the possibility of gold photosensitization of titania by electron injection into the conduction band. After describing the most common procedures used to prepare Au/TiO 2 , the central part of this article is focused on the photocatalytic activity reported for Au/TiO 2 for hydrogen generation, dye decoloration, phenoldecomposition and carboxylic acid degradation, among other processes. Emphasis is given to the role that parameters like Au loading, particle size, surface area, spatial structuring and others play on the photocatalytic activity. One important issue has been to distinguish those reports using visible light from those other in which direct titania excitation by UV light has been used. These Au/TiO 2 photocatalysts can find real applications in the near future for environmental remediation and for hydrogen generation. Irradiation at the Au surface plasmon band introduces visible-light photocatalytic activity in titania that depends on the particle size and loading.