Multicomponent Mass Transport Model for the Sorption of Metal Ions on Bone Char

摘要

The sorption of binary mixtures of copper/cadmium and copper/zinc ions onto bone char was studied infixed beds.The effects of solution flow rate,initial dye concentration,and bone char particle size range were investigated.A mass transport model based on film-surface diffusion and the IAS model for the equilibrium relationship was used to develop theoretical fixed-bed breakthrough curves.The model incorporates the Sips isotherm for the first time in fixed-bed predictions,since this isotherm gives an excellent correlation of the experimental equilibrium data.The model was used to determine the optimum surface diffusivities as 7.37 X 10~(-10) and 2.73 X 10~(-9) cm~2/s for copper and cadmium in the Cu/Cd system; and 1.61 X 10~(-9) and 2.43 X 10~(-9) cm~2/s for copper and zinc in the Cu/Zn system.