The equilibrium time, the yield and the extraction capacity increase with the initial pH of the aqueous solution, the maximum extraction capacity of Pb2+ per the SCB is about 3.32 mg/g. In the operating condition used, a mass of 0.8 g of the SCB is enough sufficient to purify a lead solution with 20 ppm. The treatment of a mixture of metal shows that the SCB presents the sequence of following selectivity: Pb2+ > Cd2+ > Zn2+ > Cu2+ > Co2+