Mathematical Modelling of Pilot-Plant Photomineralization of Chlorophenols in Aqueous Solution, by Photocatalytic Membranes Immobilizing Titanium Dioxides.

Photomineralization of 4-chloro phenol, 2,4-dichloro phenol, and pentachloro phenol, in 9.9x10-4 - 3.8x10-5 M aqueous solutions, in the presence of stoichiometric hydrogen peroxide, was studied using PHOTOPERM CPP/313 membranes containing immobilized 30+-3 wt% TiO2, by following analytically both disappearance of absorbable chloro-organics (AOX), and mineralization of total organic carbon (TOC) content. Experiments were carried out in a PHOTOPERM WP pilot plant, using monochromatic irradiation (254 nm) in the adsorption range of semiconductor, with an absorbed power of 22+-1 W. The initial rate of photodegradation, both regarding AOX and TOC analysis, was studied as a function of the initial concentration of substrate using the linearized form of the Langmuir-Hinshelwood equation, from which the rate constant k and apparent adsorption constants K were evaluated. These parameters, which are unable to fit the whole photomineralization kinetic curves either than at degradation times approaching zero, were employed to optimize, by numerical integration, a kinetic model which considers appearance and disappareance of all intermediates ...

TATTI Luca;  NIEGO Davide;  ROTA Fabrizio;  BRUZZI Paolo;  BELLOBONO Ignazio Renato;  MORONI Alberto;  BONARDI Mauro;  BIANCHI Michele;  MUNTAU Herbert Wilhelm; 

1996-10-03

JRC13870

https://publications.jrc.ec.europa.eu/repository/handle/JRC13870,