The study assessed the potential application of periwinkle shells and bamboo culms carbon as biosorbents for the competitive sorption of cadmium and lead ions from aqueous solution. The bamboo culms and periwinkle shells were carbonized (pyrolyzed) at 500°c. These were milled, sieved with shaker sieve and some of the carbon (bamboo and periwinkle) were blended in a rotary blender in the ratio of 1:1. The bamboo and periwinkle carbon were characterized and used to determine the amount absorbed (q^t) mg/g. The applicability of equilibrium isotherms models and equilibrium kinetics models were examined for the experimental data. The results from the competitive sorption systems shows that sorption maxima (mgg^-1) for the Cd, and Pb ions followed the order Cd²⁺ > Pb²⁺ for the sorbents. In equilibrium kinetics, the experimental data fits pseudo second order equation.