Modeling the effects of methanol on iron dechlorination of a complex chlorinated NAPL

Chen, Xiaosong; Clark, Clayton J.

doi:10.1016/j.jhazmat.2008.08.055

Cited by 9 publications

(2 citation statements)

References 16 publications

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“…The difference in reaction rates types can be attributed to the varying mechanisms of treatment. Oxidation utilizing ZVI has been shown to be dependent upon the rate of adsorption of a contaminant solute to the iron surface (Clark et al, 2003;Chen and Clark, 2009). Therefore, the linear rate of disappearance was found as combination of what was adsorbed on the iron surface and what was oxidized once there.…”

Section: Bpa Degradation With Zvimentioning

confidence: 99%

Evaluation of Potential Degradation of Bisphenol A by Zero-Valent Iron (ZVI)

Clark

Cooper

Martin

et al. 2012

Environmental Forensics

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This study examined the potential degradation of bisphenol-A (BPA) in water by zero-valent iron (ZVI). Experimentation showed BPA in water degraded when contacted with ZVI and displayed a first-order degradation rate constant of 0.0072 hr −1 and half-life of 96.3 hours with an initial concentration of 2 ppm. Analysis showed absence of BPA from ZVI surface suggesting that as it contacted the iron surface, it degraded; further suggesting ZVI may treat BPA at high concentrations. These results paralleled others examining ZVI treatment of other contaminants. Therefore, ZVI may be optimized to treat water contaminated with BPA at natural conditions.

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Section: Bpa Degradation With Zvimentioning

confidence: 99%

Evaluation of Potential Degradation of Bisphenol A by Zero-Valent Iron (ZVI)

Clark

Cooper

Martin

et al. 2012

Environmental Forensics

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“…In such systems, catalytic hydrogenation was proposed as the major pathway for the debromination of PBDEs [19]. Since water could provide protons more quickly than organic co-solvents such as methanol, the degradation efficiency was usually inhibited by organic co-solvents [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Removing polybrominated diphenyl ethers in pure water using Fe/Pd bimetallic nanoparticles

Zhang

Lü

et al. 2015

Front. Environ. Sci. Eng.

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Polybrominated diphenyl ethers (PBDEs) have been widely used as fire-retardants. Due to their high production volume, widespread usage, and environmental persistence, PBDEs have become ubiquitous contaminants in various environments.Nanoscale zero-valent iron (ZVI) is an effective reductant for many halogenated organic compounds. To enhance the degradation efficiency, ZVI/ Palladium bimetallic nanoparticles (nZVI/Pd) were synthesized in this study to degrade decabromodiphenyl ether (BDE209) in water. Approximately 90% of BDE209 was rapidly removed by nZVI/Pd within 80 min, whereas about 25% of BDE209 was removed by nZVI. Degradation of BDE209 by nZVI/Pd fits pseudo-first-order kinetics. An increase in pH led to sharply decrease the rate of BDE209 degradation. The degradation rate constant in the treatment with initial pH at 9.0 was more than 6.8 Â higher than that under pH 5.0. The degradation intermediates of BDE209 by nZVI/Pd were identified and the degradation pathways were hypothesized. Results from this study suggest that nZVI/Pd may be an effective tool for treating polybrominated diphenyl ethers (PBDEs) in water.

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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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Modeling the effects of methanol on iron dechlorination of a complex chlorinated NAPL

Cited by 9 publications

References 16 publications

Evaluation of Potential Degradation of Bisphenol A by Zero-Valent Iron (ZVI)

Evaluation of Potential Degradation of Bisphenol A by Zero-Valent Iron (ZVI)

Removing polybrominated diphenyl ethers in pure water using Fe/Pd bimetallic nanoparticles

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

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