Photocatalytic degradation of organic compounds in aqueous systems by transition metal doped polycrystalline TiO2

被引:276
作者
Di Paola, A
García-López, E
Ikeda, S
Marcì, G
Ohtani, B
Palmisano, L
机构
[1] Univ Palermo, Dipartimento Ingn Chim Proc & Mat, I-90128 Palermo, Italy
[2] Hokkaido Univ, Ctr Catalysis Res, Sapporo, Hokkaido 0600811, Japan
关键词
doped polycrystalline TiO2; heterogeneous photocatalysis; photodegradation of organic compounds;
D O I
10.1016/S0920-5861(02)00048-2
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Some probe catalytic photooxidation reactions with aliphatic and aromatic organic compounds having different acid strengths, i.e. methanoic acid, ethanoic acid, benzoic acid and 4-nitrophenol, were carried out in aqueous systems by using polycrystalline TiO2 powders doped with various transition metal ions (Co, Cr, Cu, Fe, Mo, V and W). The Co-doped powder showed to be more photoactive than the bare TiO2 for methanoic acid degradation while the behaviour of TiO2/Cu and TiO2/Fe was similar to that of the support. TiO2/W was the most efficient sample for the photodegradation of benzoic acid and 4-nitrophenol, TiO2 the most active powder for ethanoic acid. A tentative explanation is provided by taking into account: (i) the dissociation constants (K-a) of the different acids used as substrates; (ii) their aliphatic or aromatic nature; (iii) the points of zero charge (PZC) of the photocatalysts; (iv) their relative rate constants for photoelectron-hole recombination (k(r)) determined by femtosecond pump-probe diffuse reflectance spectroscopy. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:87 / 93
页数:7
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