6533b85dfe1ef96bd12be5a4
RESEARCH PRODUCT
Some working principles of heterogeneous photocatalysis by semiconductors
Mario Schiavellosubject
Aqueous solutionbusiness.industryChemistryGeneral Chemical EngineeringPhotoelectrochemistryInorganic chemistryNanotechnologyElectron holeElectrocatalystChemical speciesSemiconductorAdsorptionElectrochemistryPhotocatalysisbusinessdescription
The present paper outlines some of the principles which are the working base for the photocatalytic processes: we refer to those photocatalytic processes performed using irradiated semiconductors. The steps related to the photoproduction of electron-hole pairs and their separation are discussed. It is also shown how the step of pair separation induces the formation of various chemical species, some of which are useful for the oxidation reactions. It is also shown that in order to reach a detailed description of photocatalytic processes it is necessary to have the knowledge of both the electronic and the physicochemical features of the semiconductors. The paper finally reports a case study related to the solid system, Cr2O3·TiO2, used as the photocatalyst for two reactions, namely the photoreduction of N2 in the presence of H2O vapour and the photo-oxidation of aqueous solutions of phenol. The results are discussed taking into account the basic principles outlined in the paper.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1993-01-01 | Electrochimica Acta |