二氧化钛紫外光催化降解甲基橙废水的动力学研究

Kinetic Study on Degradation of Methyl Orange Wastewater by UV-Photocatalytic in TiO_2 Suspension

以甲基橙为研究对象,探讨了在253.7 nm UV的照射下TiO2光催化降解甲基橙的影响因素以及光催化反应的动力学模型。结果表明,当TiO2投加量为30 mg.L-1、反应时间为120 min、甲基橙初始浓度为10 mg.L-1、pH值为5时,甲基橙降解率达到99.57%。TiO2投加量、甲基橙浓度、pH值对光催化降解的表观一级速率常数有很大影响。光催化降解甲基橙反应动力学符合准一级Langmuir-Hinshel wood方程。

Photocatalytic degradation of methyl orange irradiated by 253.7 nm UV lamp in TiO2 suspension has been studied. The results showed that the degradation rate of methyl orange could reach 99. 57% when TiO2 dosage was 30 mg · L^-1 ,the reaction time was 120 rain,the initial methyl orange concentration was 10 mg· L^-1 and the pH value was 5. The photocatalytic degradation reaction of methyl orange follows pseudo-firstorder Langmuir-Hinshelwood kinetics equation.