Cited by 102Advanced oxidation water treatmentEnzyme-mediated dye degradationCoagulation and Flocculation Studies

Carbonate-activated hydrogen peroxide oxidation process for azo dye decolorization: Process, kinetics, and mechanisms

Li, Yang, Li, Lei, Chen, Zi-Xi, Zhang, Jie, Gong, Li, Wang, Yi-Xuan, Zhao, Han-Qing, Mu, Yang·2018·Chemosphere

Abstract

Advanced oxidation processes offer effective solutions in treating wastewater from various industries. This study is the first time to investigate the potential of carbonate-activated hydrogen peroxide (CAP) oxidation process for the removal of organic pollutant from highly alkaline wastewaters. Azo dye acid orange 7 (AO7) was selected as a model pollutant. The influences of various parameters on AO7 decolorization by the CAP oxidation were evaluated. Furthermore, the active species involved in AO7 degradation were explored using scavenger experiments and electron spin resonance analysis. Additionally, AO7 degradation products by the CAP oxidation were identified to elucidate possible transformation pathways. Results showed that the CAP oxidation had better AO7 decolorization performance compared to bicarbonate-activated hydrogen peroxide method. The AO7 decolorization efficiency augmented from 3.70 ± 0.76% to 54.27 ± 2.65% when carbonate concentration was increased from 0 to 50 mM at pH 13.0, and then changed slightly with further increasing carbonate concentration to 70 mM. It increased almost linearly from 5.95 ± 0.32% to 94.03 ± 0.39% as H 2 O 2 concentration was increased from 5 to 50 mM. Moreover, trace amount of Co(II) could facilitate AO7 decolorization by the CAP reaction. Superoxide and carbonate radicals might be the main reactive oxygen species involved in the CAP process. Finally, a possible degradation pathway of AO7 by the CAP oxidation was proposed based on the identified products.

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Crossref · 10.1016/j.chemosphere.2017.10.126

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Authors
Li, Y., Li, L., Chen, Z.-X., Zhang, J., Gong, L., Wang, Y.-X., Zhao, H.-Q., & Mu, Y.
Affiliations
University of Science and Technology of China (CN)
Corresponding author
Mu, Yang
Venue
Chemosphere
Publisher
Elsevier BV
Published
2018-02
Volume
192
Pages
372-378
ISSN
0045-6535 (ISSN-L)
OpenAlex
W2767448621
Cited by
102
References
57
Citations by year
2026: 6 · 2025: 8 · 2024: 18 · 2023: 12 · 2022: 12 · 2021: 13 · 2020: 11 · 2019: 13 · 2018: 8 · 2016: 1
FWCI
4.67
Type
journal article
Language
en
Open access
closed
Locations
  • Chemosphere (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Natural Science Foundation of China (51538012, 51478446)
  • Global Experts
  • Fundamental Research Funds
Topics
  • Physical Sciences › Environmental Science › Water Science and Technology › Advanced oxidation water treatment
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Enzyme-mediated dye degradation
  • Physical Sciences › Environmental Science › Water Science and Technology › Coagulation and Flocculation Studies
Keywords
azo dye decolorization, Acid Orange 7, alkaline wastewater treatment, advanced oxidation processes, superoxide, carbonate radical, cobalt(II) catalysis, degradation pathways, reactive oxygen species, hydrogen peroxide activation
MeSH terms
Azo Compounds, Benzenesulfonates, Bicarbonates, Carbonates, Coloring Agents, Environmental Pollutants, Hydrogen Peroxide, Kinetics, Oxidation-Reduction, Peroxides, Environmental Restoration and Remediation

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