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Most of these methods suffer from drawbacks such as high capital, operational cost, time consumption, equipment complexity and the disposal of the residual metal sludge (Amuda and Ibrahim, 2006). Adsorption is the process of collecting soluble substances (adsorbate) that are in solution, on a suitable interface (with adsorbent). The interface can be between the liquid and a gas, a solid, or another liquid. Absorption offers the best solution since the process is cheap, fast and fewer complexes coupled with the fact that sophisticated items of equipment are not required to conduct the experiments (ASTM, D4607).

Competitive Sorption of Lead and Cadmium (II) Ions from Aqueous Media Using Carbon from Bamboo Culms and Periwinkle Shells