Role of zero-valent iron in the degradation of organochlorine substances in groundwater

Vodyanitskiĭ, Yu. N.; Mineev, V. G.; Шоба, С. А.

doi:10.3103/s0147687414040085

Cited by 5 publications

(2 citation statements)

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“…Fe (III) is insoluble and may precipitate and deposit a hydroxide film on the surfaces of nZVIs, decreasing their activities. The formation of hydrogen would also deactivate the reactive sites on nZVIs [25]. The gradual loss of nZVI activity may have caused the gradual decrease in the efficiency at which the endosulfan was removed in our experiments.…”

Section: Resultsmentioning

confidence: 93%

“…Some chlorinated pesticides (e.g., endosulfan) can accept electrons and undergo reductive dechlorination [4] [16] [25]. The coupling of the iron oxidation and pesticide reduction reactions is often highly energetically Percentage removal of endosulfan between days also depicted a significant difference (p < 0.001).The percentage removal of endosulan is significantly higher after 28 days, followed by that in 21 days.…”

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confidence: 99%

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Nano-Phytotechnological Remediation of Endosulfan Using Zero Valent Iron Nanoparticles

Pillai¹,

Jesitha²

2016

JEP

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Endosulfan, an organochlorine pesticide, is known for its toxicity and ability to accumulate in the environment. In India endosulfan was banned only in 2011 and hence toxic residues are still persistent in the environment. The abilities of three plant species Chittaratha (Alpinia calcarata), Tulsi (Ocimum sanctum), and Lemongrass (Cymbopogon citratus) to remove endosulfan from soil in the absence and presence of zerovalent iron nanoparticles (nZVIs) (1000 mg/Kg of soil), i.e., by phytoremediation and nano-phytoremediation, were determined. Extracted soil samples from the experimental plot were analyzed using Gas Chromatograph with Electron Capture Detector (GC-ECD) and final dehalogenated product was confirmed by Mass Spectrometer (MS). A. calcarata had the best efficiency compared to the other two plant species and the efficiency decreased in the order A. calcarata > O. sanctum> C. citrates. The initial endosulfan removal rate was high (82% was removed within 7 days) when nano phytoremediation experiments were conducted with A. calcarata but then gradually decreased, probably because the activity of nZVI decreased over time. The nZVI endosulfan degradation mechanism appears to involve hydrogenolysis and sequential dehalogenation which was confirmed by GC-MS analysis. Only small amounts of endosulfan were accumulated in the plants because the added nZVIs might have promoted the reductive dechlorination of endosulfan.

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confidence: 93%

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confidence: 99%