Environmental characteristics and formations of polybrominated dibenzo-p-dioxins and dibenzofurans

Yang, Lili; Liu, Guorui; Shen, Jia; Wang, Minxiang; Yang, Qiuting; Zheng, Minghui

doi:10.1016/j.envint.2021.106450

Cited by 26 publications

(6 citation statements)

References 116 publications

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“…The hydrophobic interactions are dominant in the case of hydrophobic organic contaminants with values of octanol participation coefficients higher than six (log K ow > 6). The π−π interactions/stackings are relevant in the case of organic contaminants with planar structures (polycyclic aromatic hydrocarbons (PAHs) [ 58 ], co-planar polychlorinated biphenyls (PCBs) [ 59 ], polychlorinated dibenzo-p-dioxins and polychlorinated dibenzo-p-furans (PCDDs/Fs) [ 60 ], and polybrominated dibenzo-p-dioxins and dibenzofurans (PBDDs/Fs) [ 61 ], etc. ), while acid−base interactions with MOF structures are relevant in the case of organic contaminants with acid−base properties (possibly for chlorophenols and bromophenols).…”

Section: Removal Of Priority and Emerging Organic Contaminants From W...mentioning

confidence: 99%

Recent Progress in the Removal of Legacy and Emerging Organic Contaminants from Wastewater Using Metal–Organic Frameworks: An Overview on Adsorption and Catalysis Processes

Badea

Niculescu

2022

Materials

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Water covers about 70% of the Earth’s surface, but the amount of freshwater available for human use is only 2.5% and, although it is continuously replenished via the water cycle, freshwater is a finite and limited resource. The Earth’s water is affected by pollution and while water quality is an issue of global concern, the specific regulations on contaminants of emerging concern (CECs) are limited. In order to achieve the goals set by EU regulations, the treatment of wastewater is a scientifically and technologically challenging issue. Metal–organic frameworks (MOFs) are promising materials used for the removal of priority and emerging contaminants from wastewater, since they can mitigate those contaminants via both adsorption as well as catalysis processes. MOFs can offer selective adsorption of CECs by various adsorption mechanisms. The catalytic removal of priority and emerging organic contaminants from wastewater using MOFs implies Fenton, electro-Fenton, and photo-Fenton processes. Overall, MOFs can be considered as promising materials for the elimination of priority and emerging organic contaminants from various wastewater types, but the involved processes must be studied in detail for a larger number of compounds.

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Section: Removal Of Priority and Emerging Organic Contaminants From W...mentioning

confidence: 99%

Recent Progress in the Removal of Legacy and Emerging Organic Contaminants from Wastewater Using Metal–Organic Frameworks: An Overview on Adsorption and Catalysis Processes

Badea

Niculescu

2022

Materials

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“…Furthermore, their structural analogs in which bromine substitutes all of the chlorine atoms i.e. polybrominated dioxins and dibenzofurans (PBDD/Fs) have similar physicochemical properties but their half-lives are reported to be longer than that of the chlorinated ones [36]. It has been found that the thermal discharge of waste electronic items releases PBDDs and PBDFs up to 50-500 times in comparison to that of PCDD/Fs [37].…”

Section: Dioxins and Dibenzofuransmentioning

confidence: 99%

Persistent Organic Pollutants- A Silent Threat to the Agro-ecosystem and Surrounding Environment

Rani

Duhan

Kumar

et al. 2022

IJPSS

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Persistent organic pollutants (POPs) are a class of hazardous, bio-accumulative, biomagnified, and extremely persistent chemicals with plausible extended off-site mobility in the environment or agro-ecosystem. These constitute a wide variety of chemicals, their sources may be either natural or anthropogenic. These are contaminants of emerging concerns for researchers as well as environmentalists. These contaminants are supposed to cause toxicity in terms of their carcinogenic, genotoxic, neurotoxic, and endocrine disruptors nature. Therefore, it is very important to discuss various kinds of POPs present in the environment and their detection methods. Various extraction and analytical techniques have been strategized to determine the POPs in soil and food samples either quantitatively or qualitatively. The literature lacks a comprehensive review over various POPs present in the environment, different techniques of their extraction and analysis, along with their toxicity in agro-ecosystem. The present review is expected to fulfills this gap by considering all the necessary aspects discussed above.

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“…Polybrominated dibenzofurans (PBDFs) are dioxin-like compounds with high toxicity . As the characteristic byproducts of polybrominated diphenyl ethers (PBDEs), the most frequently used brominated flame retardants (BFRs), PBDFs with higher toxicity can be generated during degradation of PBDEs, treatment of wastes containing PBDEs, and general industrial processes . Due to the multisource release, PBDFs have been detected in various environmental compartments such as soil, air, sediments, aqueous solution, etc., − and PBDF levels in samples are significantly positive related with the detected PBDE concetration. − Although commercial penta-PBDEs, octa-PBDEs, and deca-PBDEs have been listed in the Stockholm Convention and their phase-out has been conducted worldwide, PBDEs’ legacy is still a considerable problem in the environment, because their health risk will still last for a long time due to the toxicity of their own and potential byproducts like PBDFs.…”

Section: Introductionmentioning

confidence: 99%

“…Currently, the contamination by PBDFs is mainly attributed to their direct release from waste treatment and general industrial processes, where the thermal processes dominate PBDF formation. 3 PBDF formation from other processes like PBDE degradation by chemical remediation methods is also a potential contamination source. Photolysis, zero-valent iron (ZVI) reduction, photocatalysis, and oxidation are efficient methods for PBDE degradation.…”

Section: ■ Introductionmentioning

confidence: 99%

Hydrogen-Donor-Controlled Polybrominated Dibenzofuran (PBDF) Formation from Polybrominated Diphenyl Ether (PBDE) Photolysis in Solutions: Competition Mechanisms of Radical-Based Cyclization and Hydrogen Abstraction Reactions

Liang

et al. 2023

Environ. Sci. Technol.

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Polybrominated dibenzofurans (PBDFs) are characteristic dioxin-like products of polybrominated diphenyl ether (PBDE) photolysis. In this study, competition mechanisms of radical-based cyclization and hydrogen abstraction reactions are proposed in PBDF formation. Commonly, the ortho C−Br bond dissociation during photolysis generates aryl radicals, which undergo intramolecular cyclization to form PBDFs or hydrogen abstraction with hydrogen donors (such as organic solvents and water) to form lower brominated PBDEs. By using 2,4,4′-tribromodiphenyl ether (BDE-28) as the model reactant, the experimental PBDF formation ratios in various solutions are explained quantitatively by the calculated rate constants of cyclization and hydrogen abstraction reactions using the density functional theory (DFT) method. The solvent effect of pure and mixed solvents on PBDF formation is illustrated successfully. The structure-related hydrogen donation ability for hydrogen abstraction controls the bias of competition reactions and influences PBDF formation. Water resulted to be the most significant generation of PBDFs. Fulvic and humic acid display higher hydrogen donation ability than small-molecule organics due to the partitioning effect in aqueous solution. Quantitative structure−activity relationship (QSAR) models of the calculated rate constants for 512 cyclization and 319 hydrogen abstraction reactions using 189 PBDEs as the initial reactants in water are established, revealing the high risk of PBDF formation in aqueous solution.

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Environmental characteristics and formations of polybrominated dibenzo-p-dioxins and dibenzofurans

Cited by 26 publications

References 116 publications

Recent Progress in the Removal of Legacy and Emerging Organic Contaminants from Wastewater Using Metal–Organic Frameworks: An Overview on Adsorption and Catalysis Processes

Recent Progress in the Removal of Legacy and Emerging Organic Contaminants from Wastewater Using Metal–Organic Frameworks: An Overview on Adsorption and Catalysis Processes

Persistent Organic Pollutants- A Silent Threat to the Agro-ecosystem and Surrounding Environment

Hydrogen-Donor-Controlled Polybrominated Dibenzofuran (PBDF) Formation from Polybrominated Diphenyl Ether (PBDE) Photolysis in Solutions: Competition Mechanisms of Radical-Based Cyclization and Hydrogen Abstraction Reactions

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