Catalytic dechlorination of Aroclor 1242 by Ni/Fe bimetallic nanoparticles

Zhang, Zhen; Hu, Sai; Baig, Shams Ali; Tang, Jie; Xu, Xinhua

doi:10.1016/j.jcis.2012.07.024

Cited by 40 publications

(20 citation statements)

References 17 publications

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“…In our study, we observed a lower efficiency of reductive dechlorination of Aroclor 1248 using bimetallic NPs than Zhang et al [20], who reported that 95.8% of Aroclor 1242 was dechlorinated by Ni/nFe after 24 h. This is in contrast to the 89% of total chlorine removed from Aroclor 1248 by Pd/nFe after a 6-day treatment in the present study. Several factors could determine the efficiency of Aroclor dechlorination.…”

Section: Discussioncontrasting

confidence: 87%

Nano/bio treatment of polychlorinated biphenyls with evaluation of comparative toxicity

Nguyen

Jeon

et al. 2015

Journal of Hazardous Materials

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The persistence of polychlorinated biphenyl (PCB) Aroclor 1248 in soils and sediments is a major concern because of its toxicity and presence at high concentrations. In this study, we developed an integrated remediation system for PCBs using chemical catalysis and biodegradation. The dechlorination of Aroclor 1248 was achieved by treatment with bimetallic nanoparticles Pd/nFe under anoxic conditions. Among the 32 PCB congeners of Aroclor 1248 examined, our process dechlorinated 99%, 92%, 84%, and 28% of tri-, tetra-, penta-, and hexachlorinated biphenyls, respectively. The resulting biphenyl was biodegraded rapidly by Burkholderia xenovorans LB400. Benzoic acid was detected as an intermediate during the biodegradation process. The toxicity of the residual PCBs after nano-bio treatment was evaluated in terms of toxic equivalent values which decreased from 33.8×10(-5)μgg(-1) to 9.5×10(-5)μgg(-1). The residual PCBs also had low cytotoxicity toward Escherichia coli as demonstrated by lower reactive oxygen species levels, lower glutathione peroxidase activity, and a reduced number of dead bacteria.

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Section: Discussioncontrasting

confidence: 87%

Nano/bio treatment of polychlorinated biphenyls with evaluation of comparative toxicity

Nguyen

Jeon

et al. 2015

Journal of Hazardous Materials

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“…1). Fe/Ni and Fe 0 nanoparticles are aggregated in form of chains, which has been attributed to magnetic interactions between adjacent metallic particles (Lowry and Johnson 2004;Sun et al 2006b;Zhang et al 2012;Schrick et al 2012), as well as to the natural tendency of these particles to remain in the most thermodynamically stable state (Cushing et al 2004;Kanel et al 2006). TEM images of nanoparticles ( Fig.…”

Section: Characterization Of Iron Nanoparticlesmentioning

confidence: 98%

“…However, the nature of by-products should be quite different with respect to the investigated degradation reaction. In the case of reductive transformation, formation of lower-chlorinated PCBs or biphenyl is A c c e p t e d m a n u s c r i p t expected (Wang and Zhang 1997;Fang and Al-Abed 2008;Zhang et al 2012), while the oxidation of PCBs gives a variety of more complex by-products including ringopened compounds (Anitescu and Tavlaride, 2005).…”

Section: Direct Oxidationmentioning

confidence: 99%

“…For this aim, ZVI, bimetallic Fe/Ni nanoparticles, magnetite and Nisubstituted magnetite were synthesized and characterized. It was reported that the deposition of second passive metal such as Ni or Pd on iron surfaces enhances the dechlorination of various organic compounds (Xu et al 2007;Choi et al 2008;Grittini et al 2009;Zhuang et al 2011;Zhu et Zhang 2011;Zhang et al 2012).…”

Section: Introductionmentioning

confidence: 99%

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Removal of PCBs in contaminated soils by means of chemical reduction and advanced oxidation processes

Rybnikova

Usman

Hanna

2016

Environ Sci Pollut Res

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Although the chemical reduction and advanced oxidation processes have been widely used individually, very few studies have assessed the combined reduction/oxidation approach for soil remediation. In the present study, experiments were performed in spiked sand and historically contaminated soil by using four synthetic nanoparticles (Fe(0), Fe/Ni, Fe3O4, Fe3 - x Ni x O4). These nanoparticles were tested firstly for reductive transformation of polychlorinated biphenyls (PCBs) and then employed as catalysts to promote chemical oxidation reactions (H2O2 or persulfate). Obtained results indicated that bimetallic nanoparticles Fe/Ni showed the highest efficiency in reduction of PCB28 and PCB118 in spiked sand (97 and 79 %, respectively), whereas magnetite (Fe3O4) exhibited a high catalytic stability during the combined reduction/oxidation approach. In chemical oxidation, persulfate showed higher PCB degradation extent than hydrogen peroxide. As expected, the degradation efficiency was found to be limited in historically contaminated soil, where only Fe(0) and Fe/Ni particles exhibited reductive capability towards PCBs (13 and 18 %). In oxidation step, the highest degradation extents were obtained in presence of Fe(0) and Fe/Ni (18-19 %). The increase in particle and oxidant doses improved the efficiency of treatment, but overall degradation extents did not exceed 30 %, suggesting that only a small part of PCBs in soil was available for reaction with catalyst and/or oxidant. The use of organic solvent or cyclodextrin to improve the PCB availability in soil did not enhance degradation efficiency, underscoring the strong impact of soil matrix. Moreover, a better PCB degradation was observed in sand spiked with extractable organic matter separated from contaminated soil. In contrast to fractions with higher particle size (250-500 and <500 μm), no PCB degradation was observed in the finest fraction (≤250 μm) having higher organic matter content. These findings may have important practical implications to promote successively reduction and oxidation reactions in soils and understand the impact of soil properties on remediation performance.

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“…Chlorinated aromatic compounds that are used on a large scale in chemical, pesticide, energetic material and petrochemical industries, eventually get released in wastewater (CERI, 2007;Zhang et al, 2012). In South Asian countries, nearly 14% of the global land is in use for agricultural activities with enormous consumption of organochlorine pesticides (OCP) (Atapattu and Kodituwakku, 2009).…”

Section: Introductionmentioning

confidence: 99%

Efficacy of zero-valent copper (Cu0) nanoparticles and reducing agents for dechlorination of mono chloroaromatics

2016

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Catalytic dechlorination of Aroclor 1242 by Ni/Fe bimetallic nanoparticles

Cited by 40 publications

References 17 publications

Nano/bio treatment of polychlorinated biphenyls with evaluation of comparative toxicity

Nano/bio treatment of polychlorinated biphenyls with evaluation of comparative toxicity

Removal of PCBs in contaminated soils by means of chemical reduction and advanced oxidation processes

Efficacy of zero-valent copper (Cu0) nanoparticles and reducing agents for dechlorination of mono chloroaromatics

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