Photocatalytic degradation of Reactive blue 21 dye by visible light induced/ nano-TiO2 Parisa rasuoli vanehabad

In this research, the efficacy of titanium dioxide nanoparticles in the presence of visible light and induced visible light for the removal of reactive blue 21 from aqueous solutions was investigated. The experiments were studied in a box with visible and fluorescent light bulbs, to study the effect of various parameters such as irradiatioin time, amount of catalyst, pH, initial concentration and temperature. The results showed that the performance of nano-TiO2/induced visible light system is better than nano-TiO2/visible light. Operational parameters showed that in nano-TiO2/induced visible light system at irradiation time of 10 min, the amount of 1 g of the catalyst and an alkaline media (pH =9) dye removal efficiency was over 40%. Also, the results showed that the removal efficiency decreased with increasing the dye concentration. Kinetic studies showed that the removal of reactive blue 21 by nano-TiO2/induced visible light system obeys zero-order model. In other words, the color removal rate is independent of concentration.