Adsorption studies of cadmium(II) were conducted on 623oK or 723oK carbonized banana peels named as BP623 and
respectively BP723 as well as on the dried ones (BP). Carbonization enhances the quality of organic by-product used as
adsorbent, reduces the equilibrium time and improves the quality of the final product (water). Evaluation of the effects of pH,
contact time and solution temperature showed that the uptake of cadmium(II) ions was highly dependent on these factors, and
increased with increasing pH and solution temperature.
Furthermore, the presence of carbo-acid groups on the surface of banana peels by-product enhanced the uptake of cadmium(II)
cations on the adsorbents surface. The maximum adsorption capacity was obtained with 623oK carbonized banana peels (119.84
mg/g). In addition, the desorption of cadmium(II) ions was carried out with various concentration of hydrochloric acid and the
desorption rate increase with decreasing acid concentration. The maximum desorption rate of 89.65% was obtained for BP623.