A comparison of metal uptake capacities of original and modified
orange peel was performed. Metal uptake capacities were
determined by contacting 0.5 g of the original and modified orange
peels with a synthetic solution of Cd ions in a mechanical shaker at
200 rpm for 1 h. A relatively high initial concentration of 600 mg/L
(10.676 meq/L) of Cd (II) ions were chosen in order to achieve
saturation of all sites so that the sorption capacity could be determined.
A pH value of 5.0 0.1 was maintained throughout the
experiment by adding 0.1 N NaOH or HCl.