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N2 Photoreduction and Phenol and Nitrophenol Isomers Photooxidation as Examples of Heterogeneous Photocatalytic Reactions

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Two examples of photoreactions are reported in the present paper: namely the photoreduction of N2 to NH3 in the gas-solid regime and the complete photooxidation of phenol and nitrophenols in the gas-liquid-solid regime (aqueous oxygenated dispersions). Undoped pure and iron ion doped polycrystalline titania specimens were used as photocatalysts. The presence of the dopant, in the case of N2 photoreduction, was essential for the occurrence of the photoprocess; it was, on the contrary, detrimental or indifferent in the case of phenol and nitrophenols photooxidation. The influence of several ions as Cl-, SO42-, Fe2+, Fe3+, Ag+ and of a compound such as H2O2 added to the dispersion was also investigated and the different behaviour of TiO2 (anatase) and TiO2 (rutile) was ascribed to kinetic factors.

Affiliations: 1: Dipartimento di Ingegneria Chimica dei Processi e dei Materiali Università di Palermo Viale delle Scienze 90128 Palermo, ITALY


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