Degradation of γ-HCH spiked soil using stabilized Pd/Fe0 bimetallic nanoparticles: Pathways, kinetics and effect of reaction conditions

Singh, Ritu; Misra, Virendra; Mudiam, Mohana Krishna Reddy; Chauhan, Lalit Kumar Singh; Singh, Rana Pratap

doi:10.1016/j.jhazmat.2012.08.064

Cited by 69 publications

(23 citation statements)

References 46 publications

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“…Three types of nanoparticles (mono nZVI, bare Fe/Ni, and CMC-Fe/Ni) were synthesized using the liquid phase reduction method (Chang et al 2011;Singh et al 2012). The mono nZVI was synthesized based on the following reaction (Eq.…”

Section: Preparation and Characterization Of Nanoparticlesmentioning

confidence: 99%

“…Several factors (e.g., pH, iron dosage, catalyst loading, contaminant concentration, cations) during the synthesis of CMC-stabilized nZVI and the dehalogenation process have been checked for their impacts on dechlorination efficiency (Wang et al 2010;Dong et al 2011;Singh et al 2012). However, there are only a few reports concerning the interaction modes between CMC and nZVI nanoparticles and the consequent change in surface potential due to the adsorption of CMC Phenrat et al 2008;Kim et al 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Less studies investigated consecutive degradative capability in a long time scale (Xu and Bhattacharyya 2005;Parshetti and Doong 2009). As for the degradation of γ-HCH by iron-based bimetallic nanoparticles, modification by Pd has been well documented (Nagpal et al 2010;Singh et al 2012Singh et al , 2013. By contrast, Ni is more cost-effective and also shows high reactivity for removing other types of contaminants (Bokare et al 2008;Kadu et al 2011;Xie et al 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, different catalysts may lead to different reaction pathways and intermediates or final products (Nagpal et al 2010). Interestingly, the intermediates and final products of γ-HCH degradation differ greatly among different references even using the same catalyst (Nagpal et al 2010;Singh et al 2012Singh et al , 2013.…”

Section: Introductionmentioning

confidence: 99%

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Degradation of γ-Hexachlorocyclohexane Using Carboxymethylcellulose-Stabilized Fe/Ni Nanoparticles

Yang

Sun

2015

Water Air Soil Pollut

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Carboxymethylcellulose (CMC)-stabilized and Ni-doped nanoscale zero valent iron (nZVI) particles (CMC-Fe/Ni) were synthesized to remove γ-hexachlorocyclohexane (γ-HCH) in aqueous solution. Fourier transform infrared spectroscopy results suggested that the CMC molecules were adsorbed onto iron primarily through carboxylate groups by monodentate complexation, and hydroxyl groups were also involved in the interactions between CMC and iron. The adsorbed CMC made the zeta potential of Fe/Ni nanoparticles more negative. At reaction pH of 8.3, the absolute value of zeta potential of the CMC-Fe/Ni was almost twice that of the bare one. The stability of colloidal nanoparticles was greatly enhanced as initial CMC concentration increased from 0 to 0.1 % (w/w) and did not increase further with higher CMC doses. Batch studies showed that 99.9 % of 10 mg/L γ-HCH was removed after 4 h at a mono nZVI loading level of 0.1 g/L, while the γ-HCH could be completely removed in 5 min using CMC-Fe/Ni, which exhibited a 13 times greater k obs as compared to that using bare Fe/Ni. Within 20 h, 60 mg/L γ-HCH was totally removed through 6 cycles of consecutive treatment using CMC-Fe/Ni. GC-MS analysis showed that 3,4,5,6-tetrachlorocyclohexene was the main intermediate and chlorobenzene was the final product when using mono nZVI. When treating by Fe/Ni nanoparticles, 1,2,3,4,5-pentachlorocyclohexene, 3,4,5,6-tetrachlorocyclohexene, and 1,4-dichlorobenzene were formed as intermediates and benzene and chlorobenzene as the final products. Possible degradation pathways were proposed based on the identified intermediates, and dehydrochlorination, dichloroelimination, and hydrogenolysis were involved in dechlorination.

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Section: Preparation and Characterization Of Nanoparticlesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Degradation of γ-Hexachlorocyclohexane Using Carboxymethylcellulose-Stabilized Fe/Ni Nanoparticles

Yang

Sun

2015

Water Air Soil Pollut

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“…CMC molecules with higher molecular weights and degree of substitution, i.e., the density of COOÀ groups present in CMC, produce well-dispersed smaller nanoparticles with narrow size distribution range [8]. Besides functioning as a stabilizer, CMC also provides an additional capacity for contaminant removal via adsorption [22,48]. For example, Cr (VI) removal efficiency of CMC-stabilized nZVI is~4 times higher than non-stabilized nZVI [49].…”

Section: Polymersmentioning

confidence: 99%

Stabilization of Zero-Valent Iron Nanoparticles: Role of Polymers and Surfactants

Singh¹,

Misra²

2015

Handbook of Nanoparticles

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In recent years, nanotechnology has emerged as a novel tool for application in various fields of electronics, photonics, magnetic, biomedicine, optics, etc. The ability of nanoparticles to serve as a versatile application tool could be attributed to their unique physicochemical characteristics that significantly differ from their bulk counterparts. Nevertheless, their tendency toward aggregation results in reduced reactivity and longevity which in turn exerts negative impact on their application potential. To overcome this constraint, several surface modifications and particle stabilization methods have been developed using various kind additives such as surfactants, polymers, water-soluble starch, carboxymethyl cellulose, cellulose acetate, polyacrylic acid, etc. These additives effectively control the shape and size of nanoparticles, enhance nanoparticles' stability and mobility, and thereby increase the nanoparticle efficiency. The present chapter provides a brief overview of recent developments in stabilization methods, modification approaches, additives used for stabilization of nanoparticles with special reference to polymers and surfactants, and their mechanism of action. The significance of different additives in relation to nanoparticle efficiency in degrading/reducing environmental contaminants will also be addressed.

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Application of Zero‐valent Iron Nanoparticles for Environmental Clean Up

Singh¹,

Misra²

2014

Advanced Materials for Agriculture, Food, and Environmental Safety

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Degradation of γ-HCH spiked soil using stabilized Pd/Fe0 bimetallic nanoparticles: Pathways, kinetics and effect of reaction conditions

Cited by 69 publications

References 46 publications

Degradation of γ-Hexachlorocyclohexane Using Carboxymethylcellulose-Stabilized Fe/Ni Nanoparticles

Degradation of γ-Hexachlorocyclohexane Using Carboxymethylcellulose-Stabilized Fe/Ni Nanoparticles

Stabilization of Zero-Valent Iron Nanoparticles: Role of Polymers and Surfactants

Application of Zero‐valent Iron Nanoparticles for Environmental Clean Up

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