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《工程(英文)》 >> 2019年 第5卷 第5期 doi: 10.1016/j.eng.2019.08.003

DNAN的高级氧化过程研究

a Center for Environmental Systems, Stevens Institute of Technology, Hoboken, NJ 07030, USA
b US Army RDECOM-ARDEC, Picatinny, NJ 07806, USA

收稿日期: 2018-04-26 修回日期: 2018-12-02 录用日期: 2019-06-04 发布日期: 2019-08-12

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摘要

2,4-二硝基茴香醚(DNAN)是用于替代2,4,6-三硝基甲苯(TNT)的钝感炸药的一种重要成分。为了研究初始pH和过氧化氢(H2O2)剂量对DNAN降解动力学和降解途径的影响,开展了DNAN的光催化H2O2氧化实验。结果显示,初始pH为4~7且H2O2剂量为1500~4500 ppm,使用UV/ H2O2处理浓度为250 ppm的DNAN溶液时,DNAN的降解服从零级反应动力学。但是,当H2O2剂量为750 ppm时,DNAN的降解服从类一级反应动力学。结果表明,DNAN易于被UV/H2O2氧化降解。当H2O2剂量为1500 ppm且初始pH为7时,3 h内DNAN浓度从250 ppm降到1 ppm以内;但3 h内总有机碳(TOC)和总碳(TC)浓度从100 ppm降到70 ppm以下,9 h后降到5 ppm以下,说明生成了其他有机化合物。这些中间产物氧化为CO2的速度慢于DNAN的氧化速度。UV/H2O2氧化过程中,生成的CO2释放到空气中,因为溶液pH迅速降低到3左右。9 h的UV/H2O2处理后,DNAN中的N绝大多数转化为硝态氮。研究表明,UV/H2O2氧化是处理DNAN废水的有效技术。

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