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Quantum Yield of Heterogeneous Photocatalytic Systems: Further Application of an Experimental Method for Determining the Absorbed Photon Flow

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The present paper reports additional results obtained with a method already proposed and used to measure absorbed and reflected photons during the occurrence of heterogeneous process carried out in the presence of a polycrystalline semiconductor solid suspended in aqueous solution. The limit of validity of the method is discussed and the influence of various parameters is reported. Moreover, the quantum yield for a probe photoreaction, i.e. 4-nitrophenol photo-oxidation carried out in aqueous suspensions containing various amounts of polycrystalline TiO2 (anatase) of different particle sizes, was determined by using monochromatic (λ = 366 nm) or polychromatic light (λ = 300-400 nm). The results indicated that the quantum yield was higher when light in the range 300-400 nm was used.

Affiliations: 1: Dipartimento di Ingegneria Chimica dei Processi e dei Materiali, University of Palermo, Viale delle Scienze, 90128 Palermo, Italy; 2: Instituto de Catálisis y Petroleoquimica, CSIC, Campus de la Universidad Autónoma, Cantoblanco, 28049 Madrid, Spain


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