【摘 要】
：
As nitrobenzene (NB) is structurally stable and difficult to degrade due to the presence of an electron withdrawing group (nitro group).The sequential nanoscale zero valent iron-persulfate (NZVI-Na2S2O8) process was proposed in this study for the degradat
【机 构】
：
Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering,North University of China,Taiy
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As nitrobenzene (NB) is structurally stable and difficult to degrade due to the presence of an electron withdrawing group (nitro group).The sequential nanoscale zero valent iron-persulfate (NZVI-Na2S2O8) process was proposed in this study for the degradation NB-containing wastewater.The results showed that the NB degradation efficiency and the total organic carbon removal efficiency in the sequential NZVI-Na2S2O8 process were 100％ and 49.25％,respectively,at a NB concentration of 200 mg L-1,a NZVI concentration of 0.75 g L-1,a Na2S2O8 concentration of 26.8 mmol L-1,an initial pH of 5,and a reaction time of 30 min,which were higher than those (88.53％ and 35.24％,respectively) obtained in the NZVI/Na2S2O8 process.Sulfate radicals (SO4·-) and hydroxyl radicals (·OH) generated in the reaction were identified directly by electron paramagnetic resonance spectroscopy and indirectly by radical capture experiments,and it was shown that both SO4-and ·OH played a major role in the sequential NZVI-Na2S2O8 process.The possible pathways involved in the reduction of NB to aniline(AN) and the further oxidative degradation of AN were determined by gas chromatography-mass spectrometry.
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