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- Title
The production of rice straw-derived biochar and its application for enhanced decolorization of azo dye as the role of redox mediator.
- Authors
Cong Ding; Jingjing Yang; Tianyin Huang; Wei Wu; Liming Zhang; Wenjun Xia; Jiabin Chen
- Abstract
The rice straw biochar (RSB) was prepared from rice straw by chemical/thermal treatment, and then characterized by scanning electron microscopy, Brunauer-Emmett-Teller, Fourier transform infrared spectroscopy, and Raman spectra. RSB was used to enhance the chemical or biological decolorization of an azo dye, orange G (OG), to evaluate the redox mediator property. Results showed that RSB could significantly accelerate the chemical reduction of OG with Na2S as the electron donor. Such an accelerating effect was positively related to RSB loading, Na2S concentration, and temperature, but negatively related to pH. In the anaerobic biological decolorization of OG, the addition of RSB could enhance the decolorization rate from 53.7% to 83.5% after 48 h. The synergistic effect of RSB on the biological decolorization of OG could be attributed to the role of redox mediator of the oxygen group on the surface of RSB, which could accelerate the electrons transfer from substrate to azo bond. The functioning of RSB as a redox mediator to enhance the decolorization rate was further verified in a continuous flow up-flow anaerobic sludge blanket reactor. Finally, the decolorization products of OG were analyzed by UV-vis and gas-chromatography and mass spectrometry, and the mechanism was subsequently proposed.
- Subjects
RICE straw; AZO dyes; ANAEROBIC reactors; FOURIER transform infrared spectroscopy; BIOCHAR; OXIDATION-reduction reaction; ELECTRON donors
- Publication
Desalination & Water Treatment, 2020, Vol 201, p369
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2020.25946