Wet air co-oxidation of decabromodiphenyl ether (BDE209) and tetrahydrofuran

Zhao, Hongxia; Zhang, Feifang; Qu, Baocheng; Xue, Xian; Liang, Xinmiao

doi:10.1016/j.jhazmat.2009.03.089

Cited by 13 publications

(10 citation statements)

References 18 publications

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“…In the BDE209/water system, $OH is the primary free radical that contributes to the debromination of BDE209; while both THF$ and $OH are the primary free radicals for the degradation of BDE209 in water/THF system. Previous studies have showed that $OH is the primary free radical that contributes to photocatalytic degradation of contaminants in the pure water system [22] while both THF$ and $OH are the primary free radicals for the degradation of organic pollutants in water/THF system [12]. A previous investigation reported that when THF amounts greatly exceeded BDE209 in the THF/water system, abundant THF$ could be formed, which when combined with $OH resulted in relatively high degradation rates [12].…”

Section: Discussionmentioning

confidence: 99%

“…Organic solvents (including THF and methanol) have been added to dissolve PBDEs [15] in water before subjecting them to oxidative removal processes [11][12][13][14]. Results showed that BDE209 could be removed efficiently in the pure water system without the addition organic solvent (THF).…”

Section: Discussionmentioning

confidence: 99%

“…For comparison, a BDE209/THF/water system was also included as a control. The final THF/water ratio was 1:1 according to Zhao et al [12].…”

Section: Experiments Set-upmentioning

confidence: 99%

“…PBDEs are sparingly soluble in water [15] but readily dissolve in organic solvents such as tetrahydrofuran (THF) and methanol [11][12][13][14]. For this reason, these organic solvents (and others) have been added to various oxidation systems to increase the solubility of PBDEs [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…For this reason, these organic solvents (and others) have been added to various oxidation systems to increase the solubility of PBDEs [11][12][13][14]. Rare information was available on the oxidation of PBDE in pure water systems.…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic degradation of polybrominated diphenyl ethers in pure water system

Zhang

Lü

2014

Front. Environ. Sci. Eng.

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Due to the low water solubility of polybrominated diphenyl ethers, organic solvent is usually added into the oxidation system to enhance the removal efficiency. In this study the photocatalytic degradation of decabromodiphenyl ether (BDE209), a type of polybrominated diphenyl ether used throughout the world, in pure water without the addition of organic solvent was investigated. In the pure water system, BDE209 was not dissolved but dispersed as nano-scale particles with a mean diameter of 166 nm. Most of BDE209 ( > 98%) were removed within 4 h and the final debromination ratio was greater than 80%. Although the addition of organic solvent (tetrahydrofuran, THF) could lead to a relatively high BDE209 degradation rate, the final debromination ratio ( < 50%) was much lower than that in pure water system. Major oxidation intermediates of tetrahydrofuran, including tetrahydro-2-furanol and γ-butyrolactone, were detected indicating the engagement of THF in the BDE209 degradation process. The photocatalytic degradation of BDE209 in the pure water system followed first-order kinetics. The BDE209 degradation rate constant increased from 0.0011 to 0.0023 min -1 as the pH increased from 3 to 9.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…For comparison, a BDE209/THF/water system was also included as a control. The final THF/water ratio was 1:1 according to Zhao et al [12].…”

Section: Experiments Set-upmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photocatalytic degradation of polybrominated diphenyl ethers in pure water system

Zhang

Lü

2014

Front. Environ. Sci. Eng.

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Characterization of the molecular degradation mechanism of diphenyl ethers by Cupriavidus sp. WS

Wang

Bai

Wang

et al. 2015

Environ Sci Pollut Res

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Commonly used flame retardants, such as polybrominated diphenyl ethers, are extremely persistent in the environment, causing serious environmental risks. Certain strains of bacteria are able to degrade several low brominated congeners of PBDEs aerobically. However, the aerobic degradation pathway is not yet well understood, particularly at the genetic level. In this study, we isolated Cupriavidus sp. WS from the environment that could degrade diphenyl ether (DE), 4-bromodiphenyl ether, and 4,4'-bromodiphenyl ether. DE was completely degraded in 6 days without any detectable end-product. Using transposon mutagenesis, several DE degradation-deficient mutants were obtained. Knocking out bphA1, bphA2, and bphA3 eliminated the ability of the Cupriavidus sp. WS bacterium to degrade DE, indicating that the bph genes play a crucial role in DE degradation by this strain. The specific roles of bphA, bphB, and bphC were identified by systematically expressing these genes in Escherichia coli. The dihydrodiol product of BphA was dehydrogenated into 2,3-dihydroxydiphenyl ether by BphB. 2,3-Dihydroxydiphenyl ether was then decomposed into phenol and 2-pyrone-6-carboxylic acid by BphC. Thus, BphA, BphB, and BphC act sequentially in the aerobic degradation of DE, 4-bromodiphenyl ether, and 4,4'-dibromodiphenyl ether by the Cupriavidus sp. WS bacterium.

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Effect of solvent on debromination of decabromodiphenyl ether by Ni/Fe nanoparticles and nano zero-valent iron particles

Tan

Liang

Wen

et al. 2016

Environ Sci Pollut Res

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Nano zero-valent iron (nZVI) and its modified nanomaterials are widely used in the degradation of some halogenated organic pollutants. In this study, we explored the effects of different proportions of tetrahydrofuran (THF) (50, 60, 70, 80, 90, and 100 %) on the degradation of decabromodiphenyl ether (BDE209) by Ni/Fe and nZVI nanoparticles with reference to the degradation kinetics, products, and pathway. The results illustrated that the effects of solvent on the degradation of BDE209 were similar when the two kinds of nanomaterials were used, although the Ni/Fe bimetallic nanoparticles exhibited a better catalytic activity compared with the pure nZVI during the degradation of BDE209. The apparent reaction rate constant (k ) increased with the proportion of the water in the system, enhancing the degradation of BDE209. In terms of degradation products, a high proportion of THF led to an accumulation of higher-brominated BDEs, inhibiting the further debromination of BDE209. The inhibitory effect of the solvent (THF) can be explained that water played a role of hydrogen donor during the reductive degradation of BDE209 in the THF/water system. However, the proportion of THF in the degradation system posed no effect on the BDE209 debromination pathway and debromination location. The difficulty of para-debromination was observed in all of the solvent systems.

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Wet air co-oxidation of decabromodiphenyl ether (BDE209) and tetrahydrofuran

Cited by 13 publications

References 18 publications

Photocatalytic degradation of polybrominated diphenyl ethers in pure water system

Photocatalytic degradation of polybrominated diphenyl ethers in pure water system

Characterization of the molecular degradation mechanism of diphenyl ethers by Cupriavidus sp. WS

Effect of solvent on debromination of decabromodiphenyl ether by Ni/Fe nanoparticles and nano zero-valent iron particles

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