Academic Journal
Molecular structure-dependent bioelectrochemical decolorization of azo dyes.
| Title: | Molecular structure-dependent bioelectrochemical decolorization of azo dyes. |
|---|---|
| Authors: | Yang HY; Key Laboratory of Water Pollution Control and Wastewater Reuse of Anhui Province, Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse, Anhui Jianzhu University, Hefei, China; State Key Laboratory of Advanced Environmental Technology Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei, China; Pollution Control and Resource Utilization in Industrial Parks Joint Laboratory of Anhui Province, Hefei, China. Electronic address: younghy@ahjzu.edu.cn., Geng X; Key Laboratory of Water Pollution Control and Wastewater Reuse of Anhui Province, Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse, Anhui Jianzhu University, Hefei, China; State Key Laboratory of Advanced Environmental Technology Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei, China., Quan ZD; Key Laboratory of Water Pollution Control and Wastewater Reuse of Anhui Province, Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse, Anhui Jianzhu University, Hefei, China., Yu L; Key Laboratory of Water Pollution Control and Wastewater Reuse of Anhui Province, Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse, Anhui Jianzhu University, Hefei, China., Huang XH; Key Laboratory of Water Pollution Control and Wastewater Reuse of Anhui Province, Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse, Anhui Jianzhu University, Hefei, China., Li WH; Key Laboratory of Water Pollution Control and Wastewater Reuse of Anhui Province, Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse, Anhui Jianzhu University, Hefei, China., Xue TZ; Key Laboratory of Water Pollution Control and Wastewater Reuse of Anhui Province, Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse, Anhui Jianzhu University, Hefei, China., Mu Y; State Key Laboratory of Advanced Environmental Technology Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei, China. |
| Source: | Bioelectrochemistry (Amsterdam, Netherlands) [Bioelectrochemistry] 2026 Aug; Vol. 170, pp. 109229. Date of Electronic Publication: 2026 Jan 19. |
| Publication Type: | Journal Article |
| Language: | English |
| Journal Info: | Publisher: Elsevier Country of Publication: Netherlands NLM ID: 100953583 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1878-562X (Electronic) Linking ISSN: 15675394 NLM ISO Abbreviation: Bioelectrochemistry Subsets: MEDLINE |
| Imprint Name(s): | Original Publication: [Amsterdam?] : Elsevier, 2000- |
| MeSH Terms: | Azo Compounds*/chemistry , Azo Compounds*/metabolism , Azo Compounds*/isolation & purification , Electrochemical Techniques*/methods , Water Pollutants, Chemical*/chemistry , Water Pollutants, Chemical*/isolation & purification , Coloring Agents*/chemistry, Kinetics ; Electrodes ; Molecular Structure |
| Abstract: | Azo dyes, containing one or more azo bonds (-N=N-), are widely used but pose environmental and health risks due to their toxicity and resistance to degradation. Bioelectrochemical systems (BESs) offer a potential approach for their reductive degradation, yet the role of molecular structure in degradation remains unclear. In this study, nine representative azo dyes were examined to access how substituent type and position affect degradation kinetics and electron transfer under controlled cathodic potentials in BESs. Electron-withdrawing substituents (e.g., -SO (Copyright © 2026 Elsevier B.V. All rights reserved.) |
| Competing Interests: | Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. |
| Contributed Indexing: | Keywords: Azo dyes; Bioelectrochemical systems; Kinetics; Molecular structure; Structure-activity relationship |
| Substance Nomenclature: | 0 (Azo Compounds) 0 (Water Pollutants, Chemical) 0 (Coloring Agents) |
| Entry Date(s): | Date Created: 20260122 Date Completed: 20260701 Latest Revision: 20260701 |
| Update Code: | 20260701 |
| DOI: | 10.1016/j.bioelechem.2026.109229 |
| PMID: | 41570540 |
| Database: | MEDLINE |
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| Header | DbId: cmedm DbLabel: MEDLINE An: 41570540 AccessLevel: 3 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Molecular structure-dependent bioelectrochemical decolorization of azo dyes. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AU" term="%22Yang+HY%22">Yang HY</searchLink>; Key Laboratory of Water Pollution Control and Wastewater Reuse of Anhui Province, Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse, Anhui Jianzhu University, Hefei, China; State Key Laboratory of Advanced Environmental Technology Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei, China; Pollution Control and Resource Utilization in Industrial Parks Joint Laboratory of Anhui Province, Hefei, China. Electronic address: younghy@ahjzu.edu.cn.<br /><searchLink fieldCode="AU" term="%22Geng+X%22">Geng X</searchLink>; Key Laboratory of Water Pollution Control and Wastewater Reuse of Anhui Province, Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse, Anhui Jianzhu University, Hefei, China; State Key Laboratory of Advanced Environmental Technology Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei, China.<br /><searchLink fieldCode="AU" term="%22Quan+ZD%22">Quan ZD</searchLink>; Key Laboratory of Water Pollution Control and Wastewater Reuse of Anhui Province, Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse, Anhui Jianzhu University, Hefei, China.<br /><searchLink fieldCode="AU" term="%22Yu+L%22">Yu L</searchLink>; Key Laboratory of Water Pollution Control and Wastewater Reuse of Anhui Province, Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse, Anhui Jianzhu University, Hefei, China.<br /><searchLink fieldCode="AU" term="%22Huang+XH%22">Huang XH</searchLink>; Key Laboratory of Water Pollution Control and Wastewater Reuse of Anhui Province, Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse, Anhui Jianzhu University, Hefei, China.<br /><searchLink fieldCode="AU" term="%22Li+WH%22">Li WH</searchLink>; Key Laboratory of Water Pollution Control and Wastewater Reuse of Anhui Province, Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse, Anhui Jianzhu University, Hefei, China.<br /><searchLink fieldCode="AU" term="%22Xue+TZ%22">Xue TZ</searchLink>; Key Laboratory of Water Pollution Control and Wastewater Reuse of Anhui Province, Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse, Anhui Jianzhu University, Hefei, China.<br /><searchLink fieldCode="AU" term="%22Mu+Y%22">Mu Y</searchLink>; State Key Laboratory of Advanced Environmental Technology Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei, China. – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22100953583%22">Bioelectrochemistry (Amsterdam, Netherlands)</searchLink> [Bioelectrochemistry] 2026 Aug; Vol. 170, pp. 109229. <i>Date of Electronic Publication: </i>2026 Jan 19. – Name: TypePub Label: Publication Type Group: TypPub Data: Journal Article – Name: Language Label: Language Group: Lang Data: English – Name: TitleSource Label: Journal Info Group: Src Data: <i>Publisher: </i><searchLink fieldCode="PB" term="%22Elsevier%22">Elsevier </searchLink><i>Country of Publication: </i>Netherlands <i>NLM ID: </i>100953583 <i>Publication Model: </i>Print-Electronic <i>Cited Medium: </i>Internet <i>ISSN: </i>1878-562X (Electronic) <i>Linking ISSN: </i><searchLink fieldCode="IS" term="%2215675394%22">15675394 </searchLink><i>NLM ISO Abbreviation: </i>Bioelectrochemistry <i>Subsets: </i>MEDLINE – Name: PublisherInfo Label: Imprint Name(s) Group: PubInfo Data: <i>Original Publication</i>: [Amsterdam?] : Elsevier, 2000- – Name: SubjectMESH Label: MeSH Terms Group: Su Data: <searchLink fieldCode="MM" term="%22Azo+Compounds%22">Azo Compounds*</searchLink>/<searchLink fieldCode="MM" term="%22Azo+Compounds+chemistry%22">chemistry</searchLink> <br /><searchLink fieldCode="MM" term="%22Azo+Compounds%22">Azo Compounds*</searchLink>/<searchLink fieldCode="MM" term="%22Azo+Compounds+metabolism%22">metabolism</searchLink> <br /><searchLink fieldCode="MM" term="%22Azo+Compounds%22">Azo Compounds*</searchLink>/<searchLink fieldCode="MM" term="%22Azo+Compounds+isolation+%26+purification%22">isolation & purification</searchLink> <br /><searchLink fieldCode="MM" term="%22Electrochemical+Techniques%22">Electrochemical Techniques*</searchLink>/<searchLink fieldCode="MM" term="%22Electrochemical+Techniques+methods%22">methods</searchLink> <br /><searchLink fieldCode="MM" term="%22Water+Pollutants%2C+Chemical%22">Water Pollutants, Chemical*</searchLink>/<searchLink fieldCode="MM" term="%22Water+Pollutants%2C+Chemical+chemistry%22">chemistry</searchLink> <br /><searchLink fieldCode="MM" term="%22Water+Pollutants%2C+Chemical%22">Water Pollutants, Chemical*</searchLink>/<searchLink fieldCode="MM" term="%22Water+Pollutants%2C+Chemical+isolation+%26+purification%22">isolation & purification</searchLink> <br /><searchLink fieldCode="MM" term="%22Coloring+Agents%22">Coloring Agents*</searchLink>/<searchLink fieldCode="MM" term="%22Coloring+Agents+chemistry%22">chemistry</searchLink><br /><searchLink fieldCode="MH" term="%22Kinetics%22">Kinetics</searchLink> ; <searchLink fieldCode="MH" term="%22Electrodes%22">Electrodes</searchLink> ; <searchLink fieldCode="MH" term="%22Molecular+Structure%22">Molecular Structure</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Azo dyes, containing one or more azo bonds (-N=N-), are widely used but pose environmental and health risks due to their toxicity and resistance to degradation. Bioelectrochemical systems (BESs) offer a potential approach for their reductive degradation, yet the role of molecular structure in degradation remains unclear. In this study, nine representative azo dyes were examined to access how substituent type and position affect degradation kinetics and electron transfer under controlled cathodic potentials in BESs. Electron-withdrawing substituents (e.g., -SO<subscript>3</subscript><superscript>-</superscript>, -NO<subscript>2</subscript>) and o-/m- substitution enhanced azo bond cleavage, while p-substitution or steric hindered degradation. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) revealed that higher reduction currents and lower charge-transfer resistance correlated with faster degradation. Quantitative structure-activity relationship (QSAR) analysis identified that the -N=N- group and other molecular features such as atom count, are key determinants of azo dyes removal. Experimental and theoretical calculations showed that molecular structure regulates the electron transfer efficiency from electrode to dye by affecting the electron density and steric hindrance of the azo bond, thereby determining degradation kinetics. This study deepened the influence of the molecular structure on azo dyes bioelectrochemical removal, and provided optimized guidance for the treatment of wastewater containing azo dyes by BESs.<br /> (Copyright © 2026 Elsevier B.V. All rights reserved.) – Name: Abstract Label: Competing Interests Group: Ab Data: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. – Name: SubjectMinor Label: Contributed Indexing Group: Data: <i>Keywords: </i>Azo dyes; Bioelectrochemical systems; Kinetics; Molecular structure; Structure-activity relationship – Name: NumberCAS Label: Substance Nomenclature Group: ID Data: 0 (Azo Compounds)<br />0 (Water Pollutants, Chemical)<br />0 (Coloring Agents) – Name: DateEntry Label: Entry Date(s) Group: Date Data: <i>Date Created: </i>20260122 <i>Date Completed: </i>20260701 <i>Latest Revision: </i>20260701 – Name: DateUpdate Label: Update Code Group: Date Data: 20260701 – Name: DOI Label: DOI Group: ID Data: 10.1016/j.bioelechem.2026.109229 – Name: AN Label: PMID Group: ID Data: 41570540 |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.bioelechem.2026.109229 Languages: – Code: eng Text: English PhysicalDescription: Pagination: StartPage: 109229 Subjects: – SubjectFull: Kinetics Type: general – SubjectFull: Electrodes Type: general – SubjectFull: Molecular Structure Type: general – SubjectFull: Azo Compounds chemistry Type: general – SubjectFull: Azo Compounds metabolism Type: general – SubjectFull: Azo Compounds isolation & purification Type: general – SubjectFull: Electrochemical Techniques methods Type: general – SubjectFull: Water Pollutants, Chemical chemistry Type: general – SubjectFull: Water Pollutants, Chemical isolation & purification Type: general – SubjectFull: Coloring Agents chemistry Type: general Titles: – TitleFull: Molecular structure-dependent bioelectrochemical decolorization of azo dyes. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Yang HY – PersonEntity: Name: NameFull: Geng X – PersonEntity: Name: NameFull: Quan ZD – PersonEntity: Name: NameFull: Yu L – PersonEntity: Name: NameFull: Huang XH – PersonEntity: Name: NameFull: Li WH – PersonEntity: Name: NameFull: Xue TZ – PersonEntity: Name: NameFull: Mu Y IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 08 Text: 2026 Aug Type: published Y: 2026 Identifiers: – Type: issn-electronic Value: 1878-562X Numbering: – Type: volume Value: 170 Titles: – TitleFull: Bioelectrochemistry (Amsterdam, Netherlands) Type: main |
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