Determination of Optimum Amounts of Effective Parameters in Reactive Dyes Removal Using Photocatalytic Reactions by Immobilized TiO2 Nano Particles on Concrete Surface

In this study the effective parameters in removal of two azo dye including Reactive Black 5 (RB5) and Reactive Red 120 (RR120) using photocatalytic method (by TiO2 nanoparticles immobilized on the concrete support) were investigated. The effect of parameters such as photocatalyst amount, initial pH, dye concentration and UV power were determined. The results showed that increase of dye concentration and decrease in pH caused decrease in dye removal rate. In order to compare dyes removal, benzene and phenol rings removal were measured in UV254 and UV310 nm wavelengths, respectively. The results in the optimum conditions showed that RB5 removal rate was more than RR120 as the removal rate was reached to 99 percent after two and half hours.