Dechlorination of chlorinated methanes by Pd/Fe bimetallic nanoparticles

Wang, Xiangyu; Chen, Chao; Chang, Yu Lin; Liu, Huiling

doi:10.1016/j.jhazmat.2008.04.027

Cited by 151 publications

(68 citation statements)

References 44 publications

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“…The removal efficiency of BDE209 in the presence of Pd was more than 3.5 times higher than that without Pd, indicating the engagement of Pd (presumably as a catalyst) in the degradation. This result also agreed with other reports in which rapid dehalogenation occurred in the presence of catalyst Pd [16,17,19]. In addition to potential catalysis by Pd, the large surface area of nanoparticles is also expected to contribute to the removal of PBDEs [28].…”

Section: Discussionsupporting

confidence: 92%

“…Hydrogen (H 2 ) can only be used efficiently for the debromination of BDE209 via hydrodebromination in the presence of Pd [16,17,19]. In this process, H 2 is adsorbed by Pd (catalyst) and dissociated into atomic H to join in the debromination of BDE209 in the NZVI/Pd.…”

Section: Discussionmentioning

confidence: 99%

“…However, nZVI alone was not effective for removing PBDEs [10]. Iron (Fe)-based bimetallic nanoparticles have been tested to degrade PBDEs in the presence of organic solvents [9,[16][17][18]. In such systems, catalytic hydrogenation was proposed as the major pathway for the debromination of PBDEs [19].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

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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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“…Luo et al (2010a) found that the rate constant increased with increasing solution pH (4-8) in debromination of TBBPA by Zn/Fe nanoparticles, yielding a positive linear correlation between log k values and the solution pH with a slope of 0.08 (R 2 = 0.90). Wang et al (2009) suggested that the optimal pH value for the highest dechlorination efficiency of chlorinated methane by Pd/ Fe nanoparticles was 7, rather than at acidic conditions. They explained that at acidic conditions, the contact (or adsorption) between target pollutants and nanoparticles may be hindered by minute H 2 bubbles produced from rapid corrosion of iron.…”

Section: Effect Of Solution Phmentioning

confidence: 99%

Reductive debromination of tetrabromobisphenol A by Pd/Fe bimetallic catalysts

Huang

Peng

et al. 2013

Chemosphere

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“…Further improvement of ZVI technology was achieved by adding Pd metal to ZVI nanoparticles (particle size 80-100 nm), which resulted in higher CF degradation rates (CF halflife 30 min) and decreased DCM formation (up to 70% of degradation products was methane). [35][36][37] Supported Pd catalysts like Pd-on-alumina (Pd/Al 2 O 3 ) are an effective material for the ambient-pressure, room-temperature hydrodechlorination (HDC) of many organochloride compounds dissolved in water. 36,[38][39][40][41][42][43][44][45][46][47][48] We previously showed that Pd metal supported on gold nanoparticles (Pd-on-Au NPs) were much more active than Pd-only catalysts.…”

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confidence: 99%

Chloroform hydrodechlorination behavior of alumina‐supported Pd and PdAu catalysts

et al. 2013

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SignificanceChloroform is a common groundwater contaminant that is very difficult to remove. Chemically converting it into a less toxic form through heterogeneous catalysis is an attractive approach over conventional physical removal methods if it can be done economically. In this study, we explore the efficacy of supported precious metal catalysts for chloroform hydrodechlorination. We find that Pd/Al 2 O 3 is catalytically active for this reaction (6.4 L/g Pd /min) at room temperature, atmospheric pressure, in buffered water, and in the presence of hydrogen gas, and that Pd deposited on commercial Au/ Al 2 O 3 shows activities as high as 22.4 L/g Pd /min, suggestive of some Pd metal located on top of Au domains. The primary reaction product is methane, with selectivity values exceeding 90%. Surface-enhanced Raman spectroscopy shows evidence of chloroform adsorption and dechlorination on the catalyst surface under aqueous conditions. The results highlight the potential of ambient-condition reductive catalysis to remove chloroform from water.

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Dechlorination of chlorinated methanes by Pd/Fe bimetallic nanoparticles

Cited by 151 publications

References 44 publications

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

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

Reductive debromination of tetrabromobisphenol A by Pd/Fe bimetallic catalysts

Chloroform hydrodechlorination behavior of alumina‐supported Pd and PdAu catalysts

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