摘要
以300 W汞灯为光源,纳米TiO2为光催化剂,甲基橙为目标降解物,以分光光度法测定其脱色率,以重铬酸钾法测定其COD降解率,研究了在不同溶液pH值、甲基橙初始浓度及TiO2投加量等条件下的甲基橙光催化降解效率.结果表明,甲基橙溶液脱色率和COD降解率并不一致,脱色比COD降解更容易发生;将脱色率、COD降解率等指标的变化综合考虑,才能更全面准确地判断光催化反应的效率.
Using 300 W mercury lamp as light source, nano-TiO2 as photocatalyst and methyl orange as degradant, we measured the decolorization rate by UV/Vis spectroscopy and COD degradation rate by potassium dichromate method. The efficiency of photocatalytic degradation of methyl orange at different pH values, the initial concentration of methyl orange and TiO2 dosage were studied. The results showed that the decolorization rate of methyl orange solution and COD degradation rate were not consistent, and the decolorization was more likely to occur than the COD degradation. Only when we consider the decolorization rate together with the COD degradation rate, can we determine the efficiency of photocatalytic reaction more fully and accurately.
出处
《浙江外国语学院学报》
2011年第4期105-112,共8页
Journal of Zhejiang International Studies University
基金
浙江省大学生科技创新活动计划项目(2011R418004)
关键词
二氧化钛
光催化降解
脱色率
COD降解率
titanium dioxide
photocatalytic degradation
decolorization rate
COD degradation rate
