Reduction of hexachlorobenzene by nanoscale zero-valent iron: Kinetics, pH effect, and degradation mechanism

Shih, Yang-hsin; Hsu, Chen-Fa; Su, Yu

doi:10.1016/j.seppur.2010.10.015

Cited by 159 publications

(71 citation statements)

References 35 publications

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“…Shih et al [106] studied the degradation mechanism of zero-valent iron nanoparticles toward the dehalogenation of hexachlorobenzene (HCB). Their study focused on the pH dependence, effect of mass concentration of zero-valent iron nanoparticles, and temperature on the dehalogenation process.…”

Section: Applications Of Nanoparticles In the Remediation Of Organohamentioning

confidence: 99%

“…However, around 60 % of HCB were remediated using ZVI NPs after 96 h at 45 ° C while in the same time period, only 40 % of HCB were degraded at 5 ° C and 25 ° C. Analysis of the degradation reaction products showed that HCB was dechlorinated. Figure 7 shows the changes in concentration of each component with the time [106] . By-product analysis indicated that degradation starts with the loss of one chlorine atom and formation of pentachlorobenzene (PCB).…”

Section: Applications Of Nanoparticles In the Remediation Of Organohamentioning

confidence: 99%

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Nanoscale materials for organohalide degradation via reduction pathways

Bolandi

Nick

Obare

2012

Nanotechnology Reviews

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The unique chemical and physical properties of nanoscale materials have led to important roles in several scientifi c and technological fi elds. Environmental chemistry processes have benefi ted from the enhanced reactivity of nanoscale particles relative to their bulk counterparts with contaminants. Here, we describe recent advances in the synthesis and characterization of metallic and bimetallic nanoparticles that have been effective toward degrading toxic organohalide contaminants. We then review the degradation mechanisms involved in the reactions of nanoscale particles with organohalides via reduction pathways. We also discuss an emerging area -the degradation of organohalides via multi-electron transfer pathways.

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Section: Applications Of Nanoparticles In the Remediation Of Organohamentioning

confidence: 99%

Section: Applications Of Nanoparticles In the Remediation Of Organohamentioning

confidence: 99%

Nanoscale materials for organohalide degradation via reduction pathways

Bolandi

Nick

Obare

2012

Nanotechnology Reviews

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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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“…Nanoscale zerovalent metals can degrade chloroethenes, PBDEs, and other contaminants with a fast kinetics and high efficiency [22][23][24][25][26]. There are still some limitations by using nano-metals, such as: toxic by-products generation due to incomplete dehalogenation [23], potential hazardous effect from nanoparticles [27], and large requirement for metals.…”

Section: Introductionmentioning

confidence: 99%