CIESC Journal ›› 2018, Vol. 69 ›› Issue (6): 2664-2671.doi: 10.11949/j.issn.0438-1157.20171310

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Degradation mechanism of Astrazon Pink FG solution by glow discharge electrolysis

LU Quanfang1,2, YU Jie2, YANG Cailing2, LI Minrui3   

  1. 1. Editorial Department of the University Journal, Northwest Normal University, Lanzhou 730070, Gansu, China;
    2. College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, Gansu, China;
    3. School of Geography and Tourism, Shaanxi Normal University, Xi'an 710119, Shaanxi, China
  • Received:2017-09-27 Revised:2017-12-11 Online:2018-06-05 Published:2017-12-18
  • Supported by:

    supported by the National Natural Science Foundation of China (21567025, 21367023) and the Natural Science Foundation of Gansu Province (17JR5RA077, 17JR5RA075).

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Abstract:

The degradation process of Astrazon Pink FG was investigated in aqueous solution by glow discharge electrolysis (GDE) technique. The active species such as HO·, H· and O· were detected by emission spectrum of GDE. The decolorization rate, removal rate of total organic carbon (TOC), solution pH, conductivity and intermediate products of the degradation solution at different discharge time were determined by ultraviolet spectrum, TOC analyzer, pH meter, conductivity meter and ion chromatography. The degradation mechanism of Astrazon Pink FG solutions was proposed according to various analysis results. The results showed that under the 600 V discharge voltage, highly active species such as HO·, O· and H· are produced. The decolorization rate and TOC removal rate of 200 ml 20 mg/L Astrazon Pink FG are up to 99.0% and 72.6% after treating 120 min. The solution pH is decreased and then increased. However, the conductivity of degradation solution is increased and then decreased. Ion chromatography test showed that the degradation process can produce a variety of small organic molecules, such as lactate, acetate, formate, malonate, malate, succinate and oxalate. Hydroxyl radical (HO·) plays a major role for the degradation of Astrazon Pink FG. It is found that under the HO·, the chemical bonds of Astrazon Pink FG is broken, and then hydroxylation of benzene ring is formed. After that, some of benzoquinone and lower molecular weight organic acids are produced. Finally, all of organic compounds are completely mineralized into Cl-, NO3-, CO2 and H2O.

Key words: GDE, plasma, dye, waste water, degradation, HO·, degradation mechanism

CLC Number: 

  • X703

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