微波/过氧化氢降解水中甲基红

摘要

The synergy effect of microwave/peroxide degradation to the methyl red in water was investigated.The initial concentration of substate,pH,the amount of hydrogen peroxide,reaction time,and temperature were examined respectively, and a mathematical model was established in order to study the degradation of methyl red.The results showed that the degradation was enhanced under alkaline conditions and a longer reaction time.If low residual concentration was demanded with high initial concentration,a high value Z ,the oxidation severity was required.The degradation of methyl red is a first order reaction,of which the reaction rate constant is 0.1 72 4 min-1 and the activation energy is 126.6 kJ/mol.The degradation rate can be as high as 78% in following conditions:initial mass concentration 130 mg/L,volume fraction of hydrogen peroxide 1.6%,reaction at 473 K for 12 min,pH=10.%研究了微波/过氧化氢协同作用下水中甲基红的降解。考察了甲基红初始质量浓度、pH、H 2 O 2加入量、反应时间、温度等因素对降解率和降解量的影响,并建立了甲基红降解的数学模型。结果表明,碱性条件下、反应时间延长有利于甲基红的降解,甲基红初始质量浓度越大,则氧化苛刻度 Z 值越大,甲基红降解反应动力学为一级反应,反应速率常数为0.1724 min-1,降解量的活化能126.6 kJ/mol。在 H 2 O 2加入体积分数为1.6%、甲基红初始质量浓度为130 mg/L、反应温度473 K、反应时间为12 min、pH=10的条件下,甲基红的降解率可达到78%。