J. Bio. Env. Sci.5(4), 301-310, October 2014
The main objective of this work was to study the degradation of the Malachite Green (MG) in aqueous solution by using titanium dioxide as a photocatalyst in a Multi-tube photoreactor. The effects of operating conditions such as initial substrate concentration, catalyst loading, pH value, inorganic salts and light intensity on the removal efficiency were evaluated. The apparent first-order rate constants (kap) were used to evaluate the degradation efficiency of MG. The optimum conditions were evaluated with initial concentration ranging from 5-50 mg/L, and TiO2 dosing ranging from 0.05-1.0 g/L in the presence of three UV-C lamps. The optimum condition was found to be 0.1 g/L of TiO2 and 10 mg/L of MG at pH=5. However, the presence of HCO3- anion leads to an increase in the effectiveness of the photocatalytic degradation. Results showed considerable reductions of MG concentration using UV/TiO2 process. Finally, this process compared with UV/H2O2 process. The results of this work proof that photocatalysis is a promising technology to reduce dyestuff (MG) from aqueous solutions.
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