Abstract:
In the water treatment field. Advanced oxidation processes (POA) are a promising alternative
to conventional methods. It allows the degradation in aqueous medium of toxic organic and
inorganic molecules recalcitrant to conventional methods. The aim of this study is to evaluate
the effectiveness and the applicability of an advanced oxidation process, called heterogeneous
photocatalysis (UV / TiO2) for the treatment of water polluted by dyes such as Carmoisine
Supra (CS). In this process, often everything happens on the surface and the adsorption of
organic compounds on the surface of the photocatalyst grains is the key step in the
heterogeneous photocatalysis process. The amount of the adsorbed dye (CS) is measured by
UV-Visible spectrum. The study has shown that it is advantageous to operate at room
temperature, at basic pH with a quantity of TiO2 equal to 1g / L. The mechanism of adsorption
on the chosen catalyst is described by pseudo-first order kinetics and that the adsorption
isotherms of the dye on the catalyst are L-type (Langmuir). In addition, an application of
several adsorption models (two, three and four parameters) has shown that the model of
(Weber and Van Vliet) with four parameters is well suited to describe the experimental results
while the models of (Fowler and Guggenheim) and (Hill and Boer) do not represent the
experimental adsorption isotherm well. On the other hand, the photocatalytic degradation of
this dye is carried out in aqueous suspension in the presence of titanium dioxide TiO2 in a Sun
test CP+. The discoloration of the suspension is effective in determining the general
mechanism of photocatalysis. The disappearance of the substrate follows pseudo first order
kinetics and the Langmuir-Hinshelwood model is well suited to describe the kinetics of
photocatalytic degradation of this dye
