Dynamic Adsorption of Cr (Ⅵ) Ions from Aqueous Solution by Canna Edulis Ker Residue in a Fixed-bed Column

摘要

A continuous dynamic adsorption in a fixed-bed column was studied by canna edulis ker residue (CEKR) as an adsorbent for the removal of Cr (Ⅵ) ions from aqueous solution. The dynamic adsorption process was simulated by some mathematic models, to determine the characteristic parameters of the column. The results indicated that CEKR could effectively absorb Cr (Ⅵ) ions from aqueous solution. Breakthrough time reaching saturation increased significantly with the increase of the temperature, while the bed depth increased and the pH value decreased, hi comparison, the initial metal concentration is able to slightly affect the adsorption. Some mathematical models could calculate the rate constants, correlation coefficients, the equilibrium adsorption and kinetic parameters, however, they were not suitable for the description the dynamic adsorption of Cr (Ⅵ) ions in the fixed-bed column.