The effect of particle size, > 850, 600-850, 425-600, 300-425,
212-300 and 150-212 µm, was determined by agitation 0.1 g of
banana peel and 100 ml of Cd(NO3)2.4H2O solution at the
concentration of 50 mg/l. Agitation contact time was kept for 24
hrs which is sufficient to reach equilibrium with a constant
agitation speed of 150 rpm at 25 ๐
C. A pH value of 3to 6 were
maintained throughout the experiment by adding 0.1 N NaOH or
HNO3 before each the experiment.