Decoloration of waste PET alcoholysis liquid by an electrochemical method

Disperse Red 60 simulated polyester alcoholysis liquid decoloration by electro-Fenton with Fe O catalyst was studied. The influences of the main operating parameters such as catalyst dosage (0.3-0.9 g/L), current density (60-120 mA/cm ) and pH (1-7) were optimized by response surface methodology (RSM...

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Bibliographic Details
Published in:Water science and technology 2018-05, Vol.77 (10), p.2463-2473
Main Authors: Li, Yanyan, Li, Mengjuan, Lu, Jing, Li, Xiaoqiang, Ge, Mingqiao
Format: Article
Language:English
Subjects:
Absorption spectra
Alcohol
Alcoholysis
Analytical methods
Catalysis
Catalysts
Chemical oxygen demand
Chemistry
Chromatography
Color
Color removal
Computer simulation
Current density
Decoloring
Degradation
Dispersion
Dyes
Electrochemistry
Fourier transforms
Infrared analysis
Infrared spectra
Infrared spectroscopy
Intermediates
Iron oxides
Liquid chromatography
Mass spectrometry
Mass spectroscopy
Oxidation
pH effects
Response surface methodology
Thermogravimetric analysis
Ultraviolet radiation
Ultraviolet spectra
Water treatment
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Summary:Disperse Red 60 simulated polyester alcoholysis liquid decoloration by electro-Fenton with Fe O catalyst was studied. The influences of the main operating parameters such as catalyst dosage (0.3-0.9 g/L), current density (60-120 mA/cm ) and pH (1-7) were optimized by response surface methodology (RSM) based on Box-Behnken surface statistical design (BBD). In optimal conditions, the initial concentration of 25 mg/L disperse red polyester alcoholysis liquid was catalyzed by 0.6 g/L Fe O , and the decoloration efficiency was 97.18% with the current density of 90 mA/cm and initial pH of 4.6. There was a relative error of 1.18% with the predicted model when the predictive value was 98.25% under the same conditions. In addition, ultraviolet-visible absorption spectra (UV-Vis), Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA) were used to study the degradation mechanism during decoloration. The intermediates were identified and the proposed degradation pathways were investigated by liquid chromatography-mass spectrometry (LC-MS) analysis.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2018.191