Photocatalytic properties of ZrO2 and Fe/ZrO2 semiconductors prepared by a sol-gel technique

被引:132
作者
Botta, SG
Navío, JA
Hidalgo, MC
Restrepo, GM
Litter, MI
机构
[1] Comis Nacl Energia Atom, Ctr Atom Constituyentes, Unidad Act Quim, RA-1650 San Martin, Buenos Aires, Argentina
[2] Univ Sevilla, CSIC, Ctr Mixto, Inst Ciencia Mat Sevilla, Seville 41092, Spain
关键词
heterogeneous photocatalysis; zirconia; titania; nitrite; EDTA; Cr(VI);
D O I
10.1016/S1010-6030(99)00150-1
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The photocatalytic efficiency of pure and 0.5-20 wt.% Fe-containing ZrO2 samples, prepared by a sol-gel technique, was tested in the transformation of environmentally important substrates, such as nitrite, EDTA and Cr(VI) and compared with that of TiO2 (Degussa P-25). All samples were active, although the efficiency was lower than that of TiO2. Nevertheless, the presence of iron increased the activity for nitrite photooxidation, with the maximum efficiency at 5 wt.% Fe content. At higher Fe content, the efficiency decreased but it was always higher than that of the undoped sample. For EDTA oxidation and Cr(VI) reduction, the same trend was observed. Remarkably, Cr(VI) reduction in the presence of EDTA was strongly accelerated, all zirconia samples being as active as P-25, although initial rates were lower and somewhat detrimentally affected by the presence of iron. The photocatalytic activity depends on the structural, surface and optical properties of the sample, on the preparation conditions and on the nature of the photocatalytic reaction. (C) 1999 Elsevier Science S.A. All rights reserved.
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页码:89 / 99
页数:11
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