Catalytic detoxification of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans in fly ash.
An efficient catalytic detoxification method for polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) in fly ash produced by municipal waste incinerator has been studied using palladium on carbon (Pd/C) catalyst. As one of the trace components in fly ash, the detoxification of PCDD/Fs is very difficult because of the interferences of other persistent components with higher concentrations. However, the detoxification reaction of PCDD/Fs shows higher activity in water/isopropanol solution using commercial Pd/C catalyst at 40 degrees C under normal pressure. The results indicated that the catalytic degradation of PCDFs has been found to be easier than that of PCDDs. Moreover, the dechlorination ratios were higher for octa- and hepta-chlorinated congeners than those for tetra- and penta-chlorinated ones. The detoxification process worked well in water. The dechlorination efficiencies of almost all of the PCDD/Fs congeners can reach over 99% within a shorter reaction time.
Yang
Zhijun
Z
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, PR China.
Xia
Chuanhai
C
Zhang
Qing
Q
Chen
Jiping
J
Liang
Xinmiao
X
D019840:2-Propanol / Q000737:chemistry; D001572:Benzofurans / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D002713:Chlorine / Q000737:chemistry; D060729:Coal Ash; D000072338:Dibenzofurans, Polychlorinated; D004785:Environmental Pollutants / Q000737:chemistry; D004787:Environmental Pollution / Q000517:prevention & control; D006859:Hydrogen / Q000737:chemistry; D017745:Incineration; D007220:Industrial Waste; D010165:Palladium / Q000737:chemistry*; D052638:Particulate Matter / Q000737:chemistry; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000737:chemistry; D018505:Waste Management / Q000379:methods*; D014867:Water / Q000737:chemistry
D001572:Benzofurans; D060729:Coal Ash; D000072338:Dibenzofurans, Polychlorinated; D004785:Environmental Pollutants; D007220:Industrial Waste; D052638:Particulate Matter; D000072317:Polychlorinated Dibenzodioxins; D014867:Water; D002713:Chlorine; D010165:Palladium; D002244:Carbon; D006859:Hydrogen; D019840:2-Propanol