Photocatalytic degradation of methyl orange

with immobilized TiO2 nanoparticles:

effect of pH and some inorganic anions


N. Barka1*, A. Assabbane1, A. Nounah2, J. Dussaud3, Y. Ait Ichou1

1 Laboratoire de Chimie Physique, Département de Chimie, Facultés des Sciences, B.P. 8106 Hay Dakhla, Agadir, Maroc

2 Laboratoire des Sciences de l'Environnement, Dépt. Génie Urbain et Environnement, EST-Salé, B.P.227, Salé Médina, Maroc

3 AHLSTROM Research & Services, ZI de l’Abbaye, 38780 pont-Evêque, France

* Corresponding author. E-mail:

Received: 18 September 2006; revised version accepted: 16 December 2007




     The photocatalytic degradation of Methyl Orange (MO) as a model pollutant compound was investigated using HPK 125W UV lamp as irradiation source, and titanium dioxide (TiO2) immobilized on paper in batch reactor. The effect of pH and some inorganic anions such as Cl-, NO3-, SO42-, CH3COO- and HPO42-, commonly present in real effluents, on the photocatalytic degradation was also studied. The photocatalytic degradation rate follows pseudo-first order kinetic with respect to (MO) concentration. The experimental results show that the photocatalytic degradation depends on the pH of the solution and is greater in acid pH zone. The presence of Cl-, SO42-, NO3- anions leads to an increase of the effectiveness of the photocatalytic degradation. However, the presence of HPO42 and CH3COO - anions decreases differently the photocatalytic efficiency.


Keywords: Photocatalytic degradation; Methyl orange; Supported TiO2 photocatalyst; Inorganic anions; Batch reactor.

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