摘要
以水溶液中苯并噻唑(BTH)为目标污染物,考察了初始pH、H2O2体积分数、n(H2O2)/n(Fe2+)、温度对其芬顿氧化降解效果的影响;借助高效液相色谱-质谱技术(HPLC-MS)对反应体系降解产物进行分析测定,提出了苯并噻唑的可能降解机制。结果表明,最佳降解条件为:pH=2.5,30%H2O2投加量为4 m L/L,n(H2O2)/n(Fe2+)=10∶1,温度为30℃,反应时间为60 min,此时,苯并噻唑去除率高达94.37%。苯并噻唑芬顿氧化降解符合一级反应动力学,根据计算,反应活化能为97 k J/mol。HPLC-MS结果显示,苯并噻唑降解中间产物为2-羟基苯并噻唑,然后噻唑环C—N键进一步断裂,生成2-甲磺酰基硝基苯。
The influences of initial pH value,H2O2 volume fraction,n（ H2O2）/n（ Fe^2＋） and temperature on the degradation efficiency of benzothiazole in aqueous solution by Fenton process is studied.The degradation products in the reaction system are analyzed by HPLC-MS. The degradation mechanism of benzothiazole is proposed. The experimental result show that the optimum oxidation degradation conditions are as follows： pH = 3,dosage of H2O2（ 30%） is 4 m L·L^-1,n（ H2O2）/n（ Fe^2＋） = 10 ∶1,temperature at 30℃ and reaction time is 60 min.The removal rate of benzothiazole is94. 37% under optimum conditions. The degrading of benzothiazole by Fenton system follows first-order kinetic model.Based on calculation,the activation energy for degradation is about 97 k J·mol^-1.The results by HPLC-MS show that the intermediate degradation product of benzothiazole is 2-hydroxy-benzothiazole,then C—N bond in thiazole ring is broken off to form 2-methylsulfonynitrobenzene eventually.
作者
韩香云
张磊
陈天明
张玉国
HAN Xiang-yun ZHANG Lei CHEN Tian-ming ZHANG Yu-guo(School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China Yancheng City Environmental Monitoring Center Station, Yancheng 224002, China)
出处
《现代化工》
CAS
CSCD
北大核心
2017年第8期117-120,共4页
Modern Chemical Industry
基金
江苏省科技厅政策引导类计划(产学研合作)--前瞻性联合研究项目(BY2015057-32)
