Dechlorination of PCBs, CAHs, herbicides and pesticides neat and in soils at 25 °C using Na/NH3

Pittman, Charles U.; He, Jinbao

doi:10.1016/s0304-3894(01)00372-7

Cited by 31 publications

(10 citation statements)

References 9 publications

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“…The effectiveness of the homogeneous SET reagents employed in this work to promote the dechlorination reaction in an ethereal solvent parallels the results previously reported by the group of Pittman in the degradation of several POPs with Na in liquid NH 3 [29,30] and is further highlighted by the results obtained in the presence of catalytic amounts of C 10 H 8 , employed as an electron shuttle.…”

Section: Discussionsupporting

confidence: 84%

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Active-alkali metal-promoted reductive cleavage of chlorinated phenols

et al. 2012

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We investigated the degradation of chlorinated phenols under reductive electron transfer reaction conditions. Although Li and Na metal proved useless, activated forms of these metals, either their soluble naphthalene radical anions or 1,2-diarylethane dianions, promoted the degradation of the starting materials to various extents. Additionally, efficient dehalogenation of the sodium salts of several mono-, di-, and tri-chlorophenols was obtained by their reduction with an excess of Na metal and a catalytic amount of naphthalene.

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Section: Discussionsupporting

confidence: 84%

“…However, despite their ready availability and high reducing power [28], only two reports concern the reductive dehalogenation of chlorophenols with Na metal in liquid ammonia [29,30].…”

Section: Introductionmentioning

confidence: 99%

Active-alkali metal-promoted reductive cleavage of chlorinated phenols

et al. 2012

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“…Moreover, the efficiency of the biological processes decreases as the initial concentration of PCP in contaminated soils increases [139]. According to Pittman and He [140], bioremediation processes can often be cost effective and can be used insitu. However, bioremediation processes are very sensitive to the temperature, the moisture content, the geology/morphology of the site and the nature of the contaminants to be remediated [129].…”

Section: Biological Treatmentmentioning

confidence: 99%

Treatment technologies used for the removal of As, Cr, Cu, PCP and/or PCDD/F from contaminated soil: A review

Guemiza

Coudert

Metahni

et al. 2017

Journal of Hazardous Materials

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The contamination of soils by metals such as arsenic, chromium, copper and organic compounds such as pentachlorophenol (PCP) and dioxins and furans (PCDD/F) is a major problem in industrialized countries. Excavation followed by disposal in an appropriate landfilling is usually used site to manage these contaminated soils. Many researches have been conducted to develop physical, biological, thermal and chemical methods to allow the rehabilitation of contaminated sites. Thermal treatments including thermal desorption seemed to be the most appropriate methods, allowing the removal of more than 99.99% of organic contaminants but, they are ineffective for inorganic compounds. Biological treatments have been developed to remove inorganic and hydrophobic organic contaminants but their applications are limited to soils contaminated by easily biodegradable organic compounds. Among the physical technologies available, attrition is the most commonly used technique for the rehabilitation of soils contaminated by both organic and inorganic contaminants. Chemical processes using acids, bases, redox agents and surfactants seemed to be an interesting option to simultaneously extract organic and inorganic contaminants from soils. This paper will provide an overview of the recent developments in the field of decontamination technologies applicable for the removal of As, Cr, Cu, PCP and/or PCDD/F from contaminated soils.

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“…Ca/NH 3 treatment can also be used for the same effect. However, laboratory studies revealed that Ca is less efficient than Na in the case where the contaminated soils contain considerable amount of water (Pittman and He 2002;Kulkarni et al 2008). Studies conducted on the treatment of PBCs by base-catalysed de-chlorination have reported that concentration of these pollutants in contaminated soil were reduced from as high as 4,000 ppm to less than 2 ppm.…”

Section: Supercritical Water Oxidationmentioning

confidence: 99%

Pollutant Diseases, Remediation and Recycling

2013

Environmental Chemistry for a Sustainable World

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Dechlorination of PCBs, CAHs, herbicides and pesticides neat and in soils at 25 °C using Na/NH3

Cited by 31 publications

References 9 publications

Active-alkali metal-promoted reductive cleavage of chlorinated phenols

Active-alkali metal-promoted reductive cleavage of chlorinated phenols

Treatment technologies used for the removal of As, Cr, Cu, PCP and/or PCDD/F from contaminated soil: A review

Pollutant Diseases, Remediation and Recycling

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