Heterogeneous photocatalytic reactions of nitrite oxidation and Cr(VI) reduction on iron-doped titania prepared by the wet impregnation method

J.A. NAVÍO; G. COLÓN; M. TRILLAS; J. PERAL; X. DOMÈNECH; J.J. TESTA; D. RODRÍGUEZ; J.R. PADRÓN; M.I. LITTER

APPLIED CATALYSIS B-ENVIRONMENTAL

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 1998 vol. 16 p. 187 - 196

0926-3373

Samples of iron-doped titania prepared by the wet impregnation method from TiO2 (Degussa P-25) and two different precursors, Fe(NO3)3.9H2O and Fe(III) acetylacetonate, were tested as photocatalysts in two reactions: nitrite oxidation and Cr(VI) reduction at pH 6.5. Whereas samples prepared from Fe(NO3)3.9H2O containing low amounts of iron (less than 2 wt.%) were more ef®cient for nitrite oxidation than pure TiO2, specimens obtained from Fe(III) acetylacetonate were less active. In the case of Cr(VI) reduction, all doped samples were less active than TiO2 with no sensibly differential activity. Different mechanistic pathways and structural and surface properties of the samples are invoked to explain the observed behavior.