Degradation of 2, 2′, 4, 4′-Tetrabrominated diphenyl ether (BDE-47) via the Fenton reaction driven by the dissimilatory metal-reducing bacterium Shewanella oneidensis MR-1. (November 2020)

• Record Type: Journal Article
• Authors: Peng, Zhaofeng; Shi, Meimei; Xia, Kemin; Dong, Yiran; Shi, Liang
• Is Part Of: Environmental pollution. Volume 266:Part 1(2020)
• Publication Date: 2020-11
• Subjects: 2, 2′, 4, 4′-tetrabrominated diphenyl ether -- Fenton reaction -- Shewanella oneidensis MR-1 -- Fe(III) (oxyhydr)oxides -- Degradation; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2020.115413
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: A microbially facilitated approach was developed to degrade 2, 2′, 4, 4′-tetrabrominated diphenyl ether (BDE-47). This approach consisted of biological production of Fe(II) and H2 O2 by the dissimilatory metal-reducing bacterium Shewanella oneidensis MR-1 during the repetitive anoxic/oxic cycles and abiotic production of hydroxyl radical (HO ● ) with the biologically produced Fe(II) and H2 O2 via Fenton reaction. Under the condition tested, BDE-47 did not inhibit the growth of S. oneidensis MR-1. Water soluble Fe(III)-citrate and the solid minerals ferrihydrite [Fe(III)2 O3 0.5H2 O] and goethite [Fe(III)OOH] were tested in this study. Under anoxic condition, the amounts of Fe(II) produced by S. oneidensis MR-1 varied among the Fe(III)s tested, which decreased in the order of Fe(III)-citrate > ferrihydrite > goethite. Under subsequent oxic condition, H2 O2 was produced via O2 reduction by S. oneidensis MR-1. The amounts of H2 O2 detected also varied, which decreased in the order of the reactions with Fe(III)-citrate > goethite > ferrihydrite. S. oneidensis MR-1 maintained its ability to produce Fe(II) and H2 O2 for up to seven anoxic/oxic cycles. At each end of anoxic/oxic cycle, HO ● was detected. The amount of HO ● produced decreased in the order of the reactions with ferrihydrite > goethite > Fe(III)-citrate, which was opposite to that of H2 O2 detected. Compared to the controls without HO ●, the amounts of BDE-47 in the reactions with HO ● decreased. The more HO ● in the reaction, the less amount of BDE-47 detected. Furthermore, no BDE-47 degradation was observed when HO ● was scavenged or ferrihydrite was either omitted or replaced by nitrate. Finally, identification of degradation products, such as hydroxylated BDE-47 and trisBDE, dibromophenol and monobromophenol, suggested that OH-addition and Br-substitution by HO ● were the main mechanisms for degrading BDE-47. Collectively, all these results demonstrated for the first time that the Fenton reaction driven by S. oneidensis MR-1 degraded BDE-47 effectively. Graphical abstract: Image 1 Highlights: BDE-47 is degraded via the Fenton reaction driven by Shewanella oneidensis MR-1. BDE-47 degradation is impacted by the Fe(III)s tested. More BDE-47 is degraded with ferrihydrite than that of goethite. More HO ● is produced with ferrihydrite and goethite than that with Fe(III)-citrate. Abstract : BDE-47 is degraded via the Fenton reaction driven by Shewanella oneiden sis MR-1 and the degradation is impacted by the Fe(III)s tested.