摘要
利用H2O2为氧化剂,高温密闭条件下对硝基苯废水进行了降解研究.通过正交实验,分析了氧化剂种类、硝基苯初始浓度、反应温度和反应时间对硝基苯降解率的影响.利用HPLC分别对降解过程产物进行了分析,实验结果表明:H2O2在密闭高温条件下形成的自由基攻击硝基苯分子,硝基苯降解过程按硝基苯→硝基酚类→二氧化碳和水的途径进行,降解过程中产生的微量邻、间、对硝基酚类物质不会累积.H2O2在反应过程中消耗不显著,具有相对的化学稳定性.H2O2热氧化硝基苯的降解反应符合一级动力学方程,反应表观速率常数K表观=0.0073min-1.
The removal of nitrobenzene （ NB ） has been investigated by using H2O2 as oxidizer and the reaction products were analyzed by HPLC. The effects of catalysts, initial concentration of NB, reaction temperature and time on NB degradation were studied by orthogonal layout experimental design. The results showed that free radical formed by H2O2 in thermal oxidized condition could attack the NB molecule, and NB degradation follows the steps as nitrobenzene→nitrophenol→carbon dioxide and water. There is no accumulation of the trace intermediate products of o-, m-, p- nitrophenol and H2O2 has remained relative stable during reaction process. The nitrobenzene degradation kinetics was in accordance with first-order and the observed reaction rate constant K was 0. 0073 min^-1
出处
《环境化学》
CAS
CSCD
北大核心
2009年第5期670-674,共5页
Environmental Chemistry
基金
973计划资助项目(2007CB613504)
教育部重大科技资助项目(307009)
关键词
H2O2
硝基苯
降解
机理
动力学.
H2O2, nitrobenzene, degradation, mechanism, kinetics.
