钨酸钠-双氧水体系催化氧化降解亚甲基蓝  

Degradation of methylene blue by catalytic oxidation in Na_2WO_4-H_2O_2 system

作　　者：高立新[1] 张大全[1] 顾茸义[1] 

机构地区：[1]上海电力学院能源与环境工程学院,上海200090

出　　处：《化工进展》2011年第4期895-900,共6页Chemical Industry and Engineering Progress

基　　金：上海市科委能力建设项目(08160512600)

摘　　要：研究了钨酸钠-双氧水体系对亚甲基蓝模拟印染废水的催化氧化降解效果。结果表明,当0.01 mol/L的钨酸钠溶液的加入量为7.0 mL、30%的双氧水溶液的加入量为3.5 mL、反应温度60℃、反应40 min后,对100 mL浓度为10 mg/L的亚甲基蓝模拟废水的脱色率接近100%。反应在较宽的pH值范围(1～14),都有较好的去除效果。紫外可见光谱分析表明,原水样在664 nm、614 nm和292 nm、244 nm处的特征吸收波峰消失了,降解为小分子物质。在此条件下的亚甲基蓝降解速率常数为0.0879 min-1,活化能较低,为34.61 kJ/mol。反应符合一级反应动力学模型。The degradation of methylene blue by catalytic oxidation in Na2WO4-H2O2 system was discussed.The results showed that the degradation rate of methylene blue was near 100% after 40 min of reaction in Na2WO4-H2O2 system.The optimum conditions for 100mL methylene blue（10 mg/L）degradation were as follows：reaction temperature 60 ℃,sodium tungstate（0.01 mol/L）dosage 7.0 mL,30% H2O2 solution dosage 3.5mL.The degradation of methylene blue was effective in a wide range of pH value（1～14）.The UV-Vis spectroscopic analyses found that the characteristic absorption peaks originally in 664 nm,614 nm and 292 nm,244 nm disappeared,indicating that hazardous organic compounds were transformed into small molecules.Under these conditions,reaction rate constant for methylene blue degradation was 0.0879 min^-1,activation energy was 34.61 kJ/mol.The degradation of methylene blue in Na2WO4-H2O2 system accorded well with the first-order kinetics mode1.

关 键 词：钨酸钠 催化氧化 亚甲基蓝 

分 类 号：X703[环境科学与工程—环境工程] TQ035[化学工程]