Abstract :
Heterogeneous photocatalysis in a water solution is recognised as a method of totally eliminating most recalcitrant
organic pollutants found in such solutions. Our current work has tried to show that the heterogeneous photocatalysis
process can also be a selective elimination method in the case of the mixture: 4-hydroxybenzoic acid (4-HBz) and
benzamide (Bz) at semi-pilot plant scale (190 dm3) under conditions of solar irradiation. The photocatalysis experiments
performed by us were done at the ‘‘Plataforma Solar de Almer ıa’’ and were carried out in the compound parabolic
collectors’ CPC system. We investigated in particular the influence of TiO2 loading, the effect of 4-HBz
concentration and the effect of the presence of chloride anions and pH on the selectivity of the reaction process.
2004 Elsevier Ltd. All rights reserved.
