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Jingjuan Qiao, Weizhou Jiao, Youzhi Liu. Degradation of nitrobenzene-containing wastewater by sequential nanoscale zero valent iron-persulfate process. Green Energy&Environment, 2021, 6(6): 910-919. doi: 10.1016/j.gee.2020.07.018
Citation: Jingjuan Qiao, Weizhou Jiao, Youzhi Liu. Degradation of nitrobenzene-containing wastewater by sequential nanoscale zero valent iron-persulfate process. Green Energy&Environment, 2021, 6(6): 910-919. doi: 10.1016/j.gee.2020.07.018
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Degradation of nitrobenzene-containing wastewater by sequential nanoscale zero valent iron-persulfate process

doi: 10.1016/j.gee.2020.07.018

  • Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, North University of China, Taiyuan, Shanxi, 030051, China

  • Received date 17 December 2019, Accepted date 22 July 2020, RevRecd date 20 July 2020, Publish date 31 December 2021,
    Abstract
  • 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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