Synthesis and Characterization of Fe-doped TiO2/Al2O3 Catalyst for Degradation of Direct Red 16 Dye by Visible Light Irradiation

فاقد چكيده فارسي

In this study, Fe-TiO2/Al2O3 powder nano-catalysts were synthesized by sol-gel technology for degrading Direct Red 16 dye under visible light. All of the synthesized catalysts were calcinated within a furnce at temperature of 550°C. Initially, optimal ranges of Fe-TiO2 and TiO2/Al2O3 catalysts were obtained by screening method under optimum pH of 2.8. For these catalysts, the values obtained from performing screening were selected within the range of 3 to 7 and 0.1 to 0.3, respectively. The optimum contents of Fe-TiO2/Al2O3 for maximum degrading of the dye was obtained based on RSM, 99% in 120 minutes. The contents of the synthesized catalyst for having this maximum photocatalytic activity was 7wt.% of Fe-TiO2/Al2O3 with mass ratio of Al2O3/TiO2 as 0.11/1 in. The experimental result for this catalyst content was 98.3%. Increasing of the amount of Fe3+ to TiO2 particles results in reduction of energy capacity band gap and enhancing the activity of visible light.