Dechlorination of dioxins with Pd/C in ethanol-water solution under mild conditions

摘要

Dechlorinations of polychlorinated dibenzo-p-dioxins(PCDDs),polychlorinated dibenzofurans(PCDFs)and coplanar polychlorinated biphenyls(co-PCBs)were carried out in ethanol-water solution of NaOH in the presence of Pd/C catalyst with using of H2.The dechlorination of octachlorodibenzo-p-furan(OCDF)proceeded with Pd/C under mild conditions(atmospheric pressure and <100°C)to give a chlorine-free product,dibenzo-p-furan(DF),in high yield.After a reaction of 3 h at 50°C,98.8% of OCDF was degraded and the yield of DF was 85.2%.PCDD/Fs and co-PCBs extract from fly ash of commercial solid-waste incinerator was degraded in this catalytic system at 50°C for 6 h.Pd/C exhibited excellent reaction activity in this catalytic system.In the dechlorination of environmental sample,the concentrations of toxic congeners and TEQ decreased to a promising level.