Preparation Of Fe³⁺/TiO₂ And Photocatalytic Degradation Of Reactive Brilliant Blue X-BR

Reactive brilliant blue X-BR is widely used in printing and dying industry,untreated reactive brilliant blue X-BR waste water can cause serious pollution to the environment and water bodies. However, the research on the high efficient degradation method for reactive brilliant blue X-BR is scarce, so how to safely and efficiently degrade reactive brilliant blue X-BR waste water has become a research point.In this paper, simple and low-cost ultrasound-impregnated was used to prepare Fe³⁺/TiO₂ photocatalyst. The factors affecting the photocatalytic efficiency were optimized and structure characterizations, including XRD and particle size analysis.Then, the degradation of reactive brilliant blue X-BR with Fe³⁺/TiO₂ was carried out.The effects of conditions were initial concentration of reactive brilliant blue X-BR,dosage of Fe³⁺/TiO₂, pH, reaction atmosphere, external sacrificial agent and irradiation power of UV light. Furthermore, the change of pH during reactive brilliant blue X-BR was researched in this paper, the Fe³⁺/TiO₂ and TiO₂ degradation efficiency were compared on the degradation of reactive brilliant blue X-BR.When the concentration was 0.75 g/L, calcination temperature was 450 ℃,calcination time was 2.5 h, Fe³⁺/TiO₂ was prepared. XRD pattern proved that Fe3+ was doped on the surface of TiO₂ and the data of laser particle size analysis suggested that the particle size of catalyst did not grow apparently during the preparation procedure.The experimental results showed that when the radiation power was 15W（λ=254 nm）,the reactive brilliant blue X-BR initial concentration was 20 mg/L, the photocatalyst dosage was 3.0 g/L, and the pH value of the solution was 7.0, the reaction time was 90 min, the photocatalytic degradation efficiency of reactive brilliant blue X-BR with Fe³⁺/TiO₂ was 93.15%. At the oxygen atmosphere, Fe³⁺/TiO₂ photocatalytic degradation of reactive brilliant blue X-BR showed a higher degradation efficiency,which showed that Fe³⁺/TiO₂ photocatalytic degradation of reactive brilliant blueX-BR was a photocatalytic oxidation reaction. Fe³⁺/TiO₂ photocatalytic degradation of reactive brilliant blue X-BR showed higher degradation efficiency at higher radiation intensity. Whether the initial pH of the reaction solution was acidic or alkaline, the solution pH value tends to be neutral, showed that it was beneficial for the emission of reactive brilliant blue X-BR waste water. Compared with pure TiO₂, the efficiency of Fe³⁺/TiO₂ was greatly improved. The presence of H₂O₂ can improve the photocatalytic degradation, for H₂O₂ and Fe3+ can form a like-Fenton system, and its degradation effect was greater than the individual H₂O₂ and Fe³⁺/TiO₂. The reaction of reactive brilliant blue X-BR was simulated with different reaction kinetics models, the results showed that pseudo first order reaction kinetics can best describe the reaction, and then the apparent reaction rate constant of Fe³⁺/TiO₂ photocatalytic degradation of reactive brilliant blue X-BR was calculated.