负载型光催化膜降解高浓度甲基橙溶液

Photocatalytic degradation of methyl orange of high concentration with TiO_2 membrane

以负载型TiO2/活性炭光催化膜降解高浓度甲基橙水溶液为处理体系,研究了负载膜型与微粉型光催化剂降解活性,考察了催化剂用量、溶液初始质量浓度、溶液pH值等对降解性能的影响。探讨了初始质量浓度对降解反应动力学的影响,确定了降解反应级数为一级,得出了不同初始质量浓度下的反应半衰期表示式。

The photocatalytic degradation of methyl orange solution, which initial concentration was higher than 600 mg·L-1, was studied with TiO2 membrane. The TiO2 membrane of mean diameter 50 ~ 100 nm was immobilized on the activated carbon particles of mean diameter 300 - 500 um. The experimental result showed that the photocatalytic activity of TiO2 membrane was higher than that of TiO2 powder photocatalyst of mean diameter 0.33 um. Effects of the photocatalyst dosage, the initial concentration and pH value of the methyl orange solution on the degradation rate were discussed. The photocatalytic reaction was efficient under the condition of the photocatalyst dosage 0.2 wt% , pH = 4.0 and different initial concentrations, and the degradation rate corresponded with the first-order kinetics equation.