Photocatalytic degradation of a textile dye by illuminated tungsten oxide nanopowder

Abstract

In this study, photocatalytic degradation of Acid Orange 7 (AO7) by tungsten oxide nanopowder under UV irradiation was investigated with variation of pH, WO3 dosage, initial AO7 concentration, purging gas, type of organic compounds and initial hydrogen peroxide concentration. Removal efficiency was decreased by increasing pH and initial AO7 concentration. The removal efficiency of AO7 was increased by purging of oxygen gas and by addition of hydrogen peroxide. The reaction rate constant (kobs) was decreased from 0.0225 to 0.0006 min-1 with increasing initial AO7 concentration from 5 to 50 mg/L, respectively. © 2015 Science & Technology Network, Inc