Removal of Cd(Ⅱ) ions by oxidized coconut coir

摘要

Biosorption potential of oxidized coconut coir (OCC) for removal of Cd(II) from aqueous medium at batch and column level was studied. Lignin and cellulose groups of coir were modified to acidic groups. Optimum biosorption was observed at pH 6. Isotherm data revealed that Langmuir gives best fit for experimental results with maximum adsorption capacity of 12.35mg/g compared to unmodified coconut coir (5.29mg/g). The column experiments were conducted as a function of flow rate, bed height, and influent Cd(II) concentration. Biosorption has best performance at 10mg/L inlet concentration, 5ml/min flow rate and 7 cm bed height.