Fe3+掺杂TiO2溶胶光催化降解甲基橙动力学研究

摘要

The sol-gel method was used to prepare TiO2 sol and Fe3+/TiO2 sol of different doping amounts of Fe3+ and TiO2.Degradation rate of methyl orange was tested as an organic contaminant.The kinetic behavior was studied on photocatalytic methyl orange of Fe3+ / TiO2 sol.The results showed the optimal concentration ratio of doping Fe3 + and TiO2 was 0.1％,the photocatalytic efficiency of TiO2 could be improved to 84.2％,and the optical response of titanium dioxide was shifted to the infrared region.Langmuir model was found to be in better correlation with the photocatalytic degradation of methyl orange.R2＞0.92 showed the degradation reaction was more suitable for the pseudo-first-order Langmuir-Hinshelwood equations.%采用溶胶-凝胶法制备TiO2溶胶和不同掺杂量Fe3+/TiO2溶胶,以甲基橙作为有机模拟污染物研究Fe3+/TiO2溶胶光催化甲基橙动力学行为和最佳降解条件.结果表明,掺杂Fe3+与TiO2的最适浓度比为Fe3+∶TiO2=0.1％,可将TiO2的光催化效果提高到84.2％,影响降解因素依次为钛醇比＞Fe3+浓度＞pH.光催化甲基橙降解过程符合Langmuir 等温吸附方程;R2＞0.92的结果表明:该降解反应较符合准一级Langmuir-Hinshelwood方程.