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  • Mathematical modelling of laboratory-scale kinetics of photomineralization of phenols and chlorophenols in aqueous solution, by photocatalytic membranes immobilizing titanium dioxide

Abstract

During photodegradation of phenol at least 20 intermediates are on the route from substrate to carbon dioxide, when carrying out experiments onto photocatalytic membranes; only a restricted number of these have been identified. The possibility of treating kinetics of all intermediates as if they were constituted by a series of molecules, the behaviour of which could be in some way mediated, has been proposed and tested for phenol. Its temporal disappearance from an illuminated TiO(2) suspension has been shown to fit satisfactorily experimental data, relative also to the appearance of CO(2), as if they were consistent with the appearance and disappearance of a hypothetical single intermediate. In order to verify the applicability of this model to photocatalytic degradation onto membranes immobilizing the semiconductor, as well its suitability to scale-up in modular plants, this model, in a modified form, was applied to experimental data of laboratory-scale runs, relative to photodegradation of phenol, 2,6-dimethyl phenol, 1,2,3-benzenetriol, 4-chloro phenol, and 2,4-dichloro phenol, for which photomineralization, in the presence of stoichiometric hydrogen peroxide, was followed primarily by accurate analysis of total organic carbon content of aqueous solutions. With phenol and 2,6-dimethyl phenol the rate of disappearance of the starting molecules was also measured. By this way a thorough examination of the fate of intermediates, and of their impact on modelling of kinetics, was intended.

Additional information

Authors: ROTA F ET AL, University of Milan, Department of Physical Chemistry and Electrochemistry (IT);BIANCHI M ET AL, JRC Ispra (IT)
Bibliographic Reference: Article: Chemosphere (1996)
Record Number: 199611083 / Last updated on: 1996-09-30
Category: PUBLICATION
Original language: en
Available languages: en