Photocatalysis of Acid Orange 10 in the presence of TiO2 under UV-irradiation

Moussa ABBAS
2021 Zenodo  
Orange G, Acid Orange 10 asulfonated azo dye, is used in silk, wool products and dyeing. It is recalcitrant to oxidative degradation, and persists in aquatic environment. The photodegradation technique is one of the processes studied over the past twenty years. Its large-scale application has grown steadily. As we will see right after, the entity that would absorb the light is a semiconductor characterized by a relatively weak Prohibited Band. Several photocatalysts have been tested sach as:
more » ... 2 .The degradation of Orange G onto TiO2 material has been investigated at batch conditions. The effects of contact time (0-60 min), initial pH (3-11), adsorbent dosage (0.1-1 g/L), and OG concentration (10-40 mg/L) on the OG adsorption by TiO2 material have been studied. The high intensity light sources increase the degradation efficiency. The experimental results showed that the efficiency of the photocatalytic process strongly depends on the pH while the initial rate of the photocatalytic reaction is proportional to the catalyst dose, but above a certain value it becomes constant and sometimes decreases. The adsorption is an important parameter controlling the apparent kinetic constant of the degradation. The photocatalytic degradation rate was favored for high concentrations of solution in agreement with Langmuir–Hinshelwood (L-H) model. The degradation rate was found to be pH and temperature dependent with a high degradation rate at high temperature.
doi:10.5281/zenodo.5515415 fatcat:kfaunl6gufcu3o5v25huotc4he