Transition metal doped TiO2: physical properties and photocatalytic behaviour

Autor: A. Di Paola, S. Ikeda, G. Marcì, B. Ohtani, L. Palmisano
Jazyk: angličtina
Rok vydání: 2001
Předmět:
Zdroj: International Journal of Photoenergy, Vol 3, Iss 4, Pp 171-176 (2001)
Druh dokumentu: article
ISSN: 1110-662X
1110662X
DOI: 10.1155/S1110662X01000216
Popis: Two probe photocatalytic reactions, i.e. ethanoic acid and 4-nitrophenol photooxidation, were carried out in different experimental conditions by using suspensions of transition metal (Co, Cr, Cu, Fe, Mo, V and W) doped polycrystalline TiO2 powders in aqueous systems. A beneficial influence of the presence of metal species was observed only with the samples containing copper and tungsten. In particular, the TiO2/Cu powders showed to be more photoactive of bare TiO2 for the ethanoic acid oxidation while the TiO2/W samples were more efficient for 4-nitrophenol degradation. A tentative interpretation is provided on the basis of the values of the points of zero charge of the powders and of the rate constants of recombination of photogenerated electrons and holes, determined by femtosecond pump-probe diffuse reflectance spectroscopy (PP-DRS).
Databáze: Directory of Open Access Journals
Externí odkaz: