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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

Postal Subscription Code 80-969

2018 Impact Factor: 2.809

Front. Chem. Sci. Eng.    2022, Vol. 16 Issue (11) : 1595-1605    https://doi.org/10.1007/s11705-022-2204-9
RESEARCH ARTICLE
High-gravity intensified iron-carbon micro-electrolysis for degradation of dinitrotoluene
Jiaxin Jing, Weizhou Jiao(), Zhixing Li, Kechang Gao, Jingwen Zhang, Gaomiao Ren, Youzhi Liu
Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, North University of China, Taiyuan 030051, China
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Abstract

The application of iron–carbon (Fe–C) micro-electrolysis to wastewater treatment is limited by the passivation potential of the Fe–C packing. In order to address this problem, high-gravity intensified Fe–C micro-electrolysis was proposed in this study for degradation of dinitrotoluene wastewater in a rotating packed bed (RPB) using commercial Fe–C particles as the packing. The effects of reaction time, high-gravity factor, liquid flow rate and initial solution pH were investigated. The degradation intermediates were determined by gas chromatography-mass spectrometry, and the possible degradation pathways of nitro compounds by Fe–C micro-electrolysis in RPB were also proposed. It is found that under optimal conditions, the removal rate of nitro compounds reaches 68.4% at 100 min. The removal rate is maintained at approximately 68% after 4 cycles in RPB, but it is decreased substantially from 57.9% to 36.8% in a stirred tank reactor. This is because RPB can increase the specific surface area and the renewal of the liquid–solid interface, and as a result the degradation efficiency of Fe–C micro-electrolysis is improved and the active sites on the Fe–C surface can be regenerated for continuous use. In conclusion, high-gravity intensified Fe–C micro-electrolysis can weaken the passivation of Fe–C particles and extend their service life.

Keywords high-gravity technology      rotating packed bed      Fe–C micro-electrolysis      dinitrotoluene wastewater      active sites     
Corresponding Author(s): Weizhou Jiao   
Online First Date: 01 November 2022    Issue Date: 13 December 2022
 Cite this article:   
Jiaxin Jing,Weizhou Jiao,Zhixing Li, et al. High-gravity intensified iron-carbon micro-electrolysis for degradation of dinitrotoluene[J]. Front. Chem. Sci. Eng., 2022, 16(11): 1595-1605.
 URL:  
https://academic.hep.com.cn/fcse/EN/10.1007/s11705-022-2204-9
https://academic.hep.com.cn/fcse/EN/Y2022/V16/I11/1595
Fig.1  Schematic view of high-gravity intensified Fe–C micro-electrolysis: 1) reservoir; 2) centrifugal pump; 3) valve; 4) flow meter; 5) RPB; 6) frequency conversion motor.
Characteristic parameter Value
Rotor inner radius/mm 60
Rotor outer radius/mm 180
Rotor height/mm 30
Packing type Fe–C particles
Packing porosity/(m3?m?3) 0.49
Tab.1  Characteristic parameters of RPB
Fig.2  Variations of (a) pH and (b) removal rate of nitro compounds and total iron concentration in the wastewater with reaction time (pH = 1.1, Q = 80 L?h?1, β = 104).
Fig.3  Effects of operating parameters on the removal rate of nitro compounds and the total iron concentration in the solution: (a, b) high-gravity factor (Q = 80 L?h?1, pH = 1.1), (c, d) liquid flow rate (β = 46.22, pH = 1.1), and (e, f) initial solution pH (β = 46.22, Q = 80 L?h?1).
Fig.4  Comparison between RPB and STR in single and cycling experiments (pH = 1.1, t = 100 min; for RPB: β = 46.22, Q = 80 L?h?1; for STR: r = 200 r?min?1).
Fig.5  SEM images and EDX spectra of Fe–C packing: (a) fresh Fe–C packing; Fe–C packing used for four cycles in (b) STR and (c) RPB.
No. Retention time/min Compound Mass spectrometry (m/z)
1 6.71–6.92 Nitrobenzene 123.1
2 10.94–11.07 3-Nitrotoluene 137.14
3 18.59–18.68 Dinitrotoluene 182.13
4 19.24–19.35 2,4-Dinitrobenzene 168.11
5 19.68–19.76 2,6-Dinitrotoluene 182.13
Tab.2  Compositions of dinitrotoluene wastewater
Fig.6  Gas chromatogram of dinitrotoluene wastewater.
Fig.7  High-gravity intensified Fe–C micro-electrolysis for degradation of nitrobenzene by ultraviolet–visible spectroscopy (pH = 1.1, t = 100 min, β = 46.22, Q = 80 L?h?1).
No. Retention time/min Compound Mass spectrometry (m/z)
1 5.76–6.05 Aniline 93.13
2 7.56–7.94 Nitrosobenzene 107.11
3 20.14–20.31 Azobenzene 182.22
Tab.3  Intermediates by GC–MS
Fig.8  GC–MS analysis of high-gravity intensified Fe–C micro-electrolysis for degradation of nitrobenzene.
Fig.9  Degradation mechanism of nitrobenzene by Fe–C micro-electrolysis.
Fig.10  Changes in the concentration of nitrobenzene and aniline (pH = 1.1, t = 60 min, β = 46.22, Q = 80 L?h–1).
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