Photocatalytic properties of aqueous systems containing TiO2 nanoparticles

0359747 - ÚFCH JH 2012 RIV NL eng J - Journal Article
Paušová, Š. - Krýsa, J. - Jirkovský, Jaromír - Forano, C. - Prevot, V. - Mailhot, G.
Photocatalytic properties of aqueous systems containing TiO2 nanoparticles.
Catalysis Today. Roč. 161, č. 1 (2011), s. 140-146. ISSN 0920-5861. E-ISSN 1873-4308
R&D Projects: GA MŠMT 1M0577
Institutional research plan: CEZ:AV0Z40400503
Keywords : TiO2 nanoparticles * photocatalysis * aging
Subject RIV: CG - Electrochemistry
Impact factor: 3.407, year: 2011

This work describes the aging of aqueous colloidal TiO2 nanoparticles at different temperatures and pH values. Emphasis was particularly given to the behaviour in the alkaline region, since this has not yet been properly reported. Aging of colloidal TiO2 suspensions has previously been investigated using spectroscopic methods (band gap energy determination) and a dynamic light scattering method (particle size determination). The photocatalytic activity, representing the most important property of TiO2 nanoparticles, was determined through the quantum yield of 4-chlorophenol degradation. It was found that the size of acidic colloidal TiO2 particles depends on the storing temperature; lower temperature leads to a small increase in particle size. The process of aging of TiO2 nanoparticles consists in slow re-crystallization that leads to slightly larger particles, and it seems that this process is faster at higher temperatures.
Permanent Link: http://hdl.handle.net/11104/0197469