Modelling of quantum yields in photocatalytic membrane reactors immobilising titanium dioxide

Bellobono, Ignazio Renato; de Martini, Giulia; Tozzi, Paola Maria; Canevali, Carmen; Morazzoni, Franca; Scotti, Roberto; Bianchi, Riccardo

doi:https://doi.org/10.1155/IJP/2006/26870

International Journal of Photoenergy

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Volume 2006 | Article ID 026870 | https://doi.org/10.1155/IJP/2006/26870

Modelling of quantum yields in photocatalytic membrane reactors immobilising titanium dioxide

Ignazio Renato Bellobono,¹Giulia de Martini,²Paola Maria Tozzi,²Carmen Canevali,³Franca Morazzoni,³Roberto Scotti,³and Riccardo Bianchi⁴

Received19 Feb 2006

Revised25 Apr 2006

Accepted04 May 2006

Published29 Aug 2006

Abstract

For some model molecules (methanoic and ethanoic acids, methane, and phenol), systematic investigations of quantum yields were carried out in the present paper, as a function of concentration and of absorbed radiant power. Quantum yields Φ∞, calculated from rates, followed an apparently Langmuirian function of initial concentration C0, by which Φ∞ values at “infinite” concentration could be obtained. By having thus established that quantum yields of photomineralisation Φ∞ are independent of radiation wavelength, within the absorption range of semiconductor, but depend on radiant power, such a dependency was experimentally investigated. For all the investigated molecules, the maximum allowable values reached in the low radiant power range clearly appeared as a plateau. On the contrary, at high radiant power values, another plateau, at a value of about 1/4-1/5 with respect to the maximum value, was evident. This was interpreted on the basis of a competition kinetics of hydroxyl radicals with themselves, leading to hydrogen peroxide formation, other than with substrate or intermediate molecules leading to full mineralisation. Modelling of quantum yields as a function of concentration and radiant power thus allows a fully consistent and trustworthy design of photoreactors.

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Copyright © 2006 Ignazio Renato Bellobono et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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