Journal
BIOELECTROCHEMISTRY
Volume 128, Issue -, Pages 9-16Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.bioelechem.2019.02.008
Keywords
Bioelectrochemical systems; Diazo dye; Kinetics; Response surface methodology; Decolorization pathway
Funding
- Natural Science Foundation of China [51538012, 51478446, 51469006]
- Fundamental Research Funds for the Central Universities
- Startup Fund for Advanced Talents of AHJZU [2018QD05]
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Bioelectrochemical systems (BESs) have shown great potential for azo dye removal. However, comprehensive evaluation of the bioelectrochemical decolorization performance for reactive diazo dyes remains limited, particularly the kinetics and operation parameter optimization. This study evaluated the decolorization of the diazo dye Reactive Black 5 (RB5) in BESs, particularly with regard to kinetics, parameter optimization using response surface methodology (RSM), and the degradation pathway. The results indicated that the pseudo-first-order kinetic rate constant of RB5 decolorization increased from 0.023 +/- 0.001 to 0.146 +/- 0.008 h(-1) with a decrease in cathode potential from -400 mV to -500 my. RSM optimization suggested that the linear effects of RB5 concentration, cathode potential and hydraulic retention time (HRT), interaction of RB5 concentration with cathodic HRT, and the quadratic effect of cathodic HRT were most influential on the bioelectrochemical decolorization of RB5. Further, the decolorized RB5 products in the BESs were characterized by ultraviolet-visible spectrophotometry, Fourier-transform infrared spectroscopy, and liquid chromatograph-mass spectrometry. From this, a potential decolorization mechanism is proposed based on cleavage of azo bonds. (C) 2019 Elsevier B.V. All rights reserved.
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