介质阻挡放电等离子体协同 $ Fe^{2+} $ 降解水中萘普生

文章利用介质阻挡放电(dielectric barrier discharge, DBD)等离子体与 $ Fe^{2+} $协同降解水中萘普生(NPX)，并与单一DBD等离子体体系进行比较。分别探究 $ Fe^{2+} $浓度、放电功率、初始pH值及天然有机物(natural organic matter, NOM)的质量浓度对NPX去除效果的影响。采用液质联用技术分析NPX降解产物，并使用毒性评估软件工具(Toxicity Estimation Software Tool, T. E. S. T.)分析预测产物的生物毒性。结果表明：在介质阻挡放电等离子体协同 $ Fe^{2+} $体系中，当 $ Fe^{2+} $浓度为200 $ \mu $mol/L、放电功率为71 W、初始pH值为4.0时NPX去除效果最好，而水中NOM的存在会抑制NPX的降解。NPX降解过程较符合准一级反应动力学模型，检测出7种中间产物，提出可能的降解路径。生物毒性预测结果表明，NPX在降解过程中会生成毒性更高的产物。

In this paper, the co-degradation of naproxen(NPX) in aqueous solution by dielectric barrier discharge(DBD) plasma combined with $ Fe^{2+} $ was studied and compared with a single DBD plasma system. The effects of $ Fe^{2+} $ concentration, discharge power, initial pH value and natural organic matter (NOM) concentration on the removal effect of NPX were investigated. The NPX degradation products were analyzed by liquid chromatography time-of-flight mass spectrometry, and the Toxicity Estimation Software Tool(T. E. S. T.) was used to evaluate the biological toxicity of NPX degradation products. The results show that the removal effect of NPX is the best when the concentration of $ Fe^{2+} $ is 200 $ \mu $mol/L, the discharge power is 71 W and the initial pH value is 4.0, and the presence of NOM in aqueous solution will inhibit the degradation of NPX. The degradation process of NPX is consistent with the quasi-first-order reaction kinetics model. Seven intermediate products were detected and the possible degradation paths were proposed. The results of biological toxicity prediction show that NPX will produce more toxic products during degradation.