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Carbonate-activated hydrogen peroxide oxidation process for azo dye decolorization: Process, kinetics, and mechanisms
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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In the citing paper
“The degradation was increased from 0 to more than 90% by increasing the concentration of H2O2 from 0 to 50 mM at a fixed CO3 2 -concentration of 10 mM.”
From Advanced Oxidation Processes for Degradation of Water Pollutants—Ambivalent Impact of Carbonate Species: A Review (2023) · cites this paper as [81]
In the citing paper
“The super oxide radical can be converted into 1 O2 [81].”
From Advanced Oxidation Processes for Degradation of Water Pollutants—Ambivalent Impact of Carbonate Species: A Review (2023) · cites this paper as [81]
In the citing paper
“A scavenging experiment with methanol and tert-butanol shows an insignificant effect on the degradation, indicating a negligible effect of · OH.”
From Advanced Oxidation Processes for Degradation of Water Pollutants—Ambivalent Impact of Carbonate Species: A Review (2023) · cites this paper as [81]
In the citing paper
“However, the para-benzoquinone and ascorbic acid had a prominent effect on the degradation. It indicates that the superoxide radical is strongly involved in the process.”
From Advanced Oxidation Processes for Degradation of Water Pollutants—Ambivalent Impact of Carbonate Species: A Review (2023) · cites this paper as [81]
In the citing paper
“Li et al. used CO3 2 -as an activator of H2O2 in the degradation of an azo dye, acid orange 7 (AO7). Nearly 83% degradation was reported after 8 h at an initial pH of 12.”
From Advanced Oxidation Processes for Degradation of Water Pollutants—Ambivalent Impact of Carbonate Species: A Review (2023) · cites this paper as [81]
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“The super oxide radical can be converted into 1 O 2 [81].”
Metadata
- 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
- 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 › Immunology and Microbiology › Applied Microbiology and Biotechnology › 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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