Degradation of naproxen in aqueous solution by dielectric barrier discharge plasma combined with Fe2+
In this paper,the co-degradation of naproxen(NPX)in aqueous solution by dielectric barrier discharge(DBD)plasma combined with Fe2+was studied and compared with a single DBD plasma sys-tem.The effects of Fe2+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 Estima-tion Software Tool(T.E.S.T.)was used to evaluate the biological toxicity of NPX degradation prod-ucts.The results show that the removal effect of NPX is the best when the concentration of Fe2+is 200 μmol/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.
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