Reductive dechlorination of polychlorinated dibenzo-p-dioxins by zerovalent iron in subcritical water.
A new method for reductive dechlorination of polychlorinated dibenzo-p-dioxins (PCDDs) and remediation of contaminated soils is described that uses zerovalent iron as the dechlorination agent and subcritical water as reaction medium and extractive solvent. It is found that the zerovalent iron can be applied for stepwise dechlorination of octachlorinated dibenzo-p-dioxin (OCDD) on various matrixes in subcritical water. By using iron powder as matrix higher chlorinated congeners were practically completely reduced to less than tetra-substituted homologues. A significant part of residual OCDD, when it was spiked in to soils, and formed less chlorinated congeners are extracted with water in the given conditions. The solubility of OCDD was increased by a 4-6 orders over its solubility at ambient conditions. The new method of contentious-flow extraction is described.
Kluyev
Nikolay
N
Institute of Ecology and Evolution RAS, Moscow, Russia. kluyv@online.ru
Cheleptchikov
Andrei
A
Brodsky
Efim
E
Soyfer
Vladimir
V
Zhilnikov
Vladimir
V
D017606:Chlorine Compounds / Q000737:chemistry; D004787:Environmental Pollution / Q000517:prevention & control*; D007501:Iron / Q000737:chemistry*; D010084:Oxidation-Reduction; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000032:analysis / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*; D012995:Solubility; D014867:Water / Q000737:chemistry
D017606:Chlorine Compounds; D000072317:Polychlorinated Dibenzodioxins; D012989:Soil Pollutants; D014867:Water; D007501:Iron