Molecular structure-dependent bioelectrochemical decolorization of azo dyes.

Λεπτομέρειες βιβλιογραφικής εγγραφής
Τίτλος: Molecular structure-dependent bioelectrochemical decolorization of azo dyes.
Συγγραφείς: 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.
Πηγή: Bioelectrochemistry (Amsterdam, Netherlands) [Bioelectrochemistry] 2026 Aug; Vol. 170, pp. 109229. Date of Electronic Publication: 2026 Jan 19.
Τύπος έκδοσης: Journal Article
Γλώσσα: English
Στοιχεία περιοδικού: 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-
Ιατρικοί όροι (MeSH): 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
Περίληψη: 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., -SO3-, -NO2) 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.
(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
Βάση Δεδομένων: MEDLINE