Photocatalytic degradation of malachite green in aqueous solution using TiO2 nanocatalyst
Paper Details
Photocatalytic degradation of malachite green in aqueous solution using TiO2 nanocatalyst
Abstract
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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