Fig. 2 shows the adsorption of PCDDs and PCDFs on activated carbon at various initial concentrations. A linear correlation is found between the adsorbed PCDDs and PCDFs and the initial concentration of dioxins-contained n-hexane. The correlation coefficients (R2 ) were 0.981 for PCDDs and 0.998 for PCDFs,respectively. than those of PCDDs. This is possibly due to the different concentrations of PCDDs and PCDFs in the solution. Since the dioxins were extracted from fly ash of municipal solid waste incinerators, their solution shows similar fingerprints as the fly ash. The amount of PCDFs is always three to four times as much as PCDDs. Because the activated carbon adsorption could make the residual concentrations of both PCDDs and PCDFs at similar low level, PCDFs with higher initial concentrations in the n-hexane solvent would have more removal
efficiencies.
Fig. 2 shows the adsorption of PCDDs and PCDFs on activated carbon at various initial concentrations. A linear correlation is found between the adsorbed PCDDs and PCDFs and the
initial concentration of dioxins-contained n-hexane. The correlation coefficients (R2 ) were 0.981 for PCDDs and 0.998 for PCDFs,respectively.