Removing lead ions was investigated from aqueous solutions using corncob (MRLZ) by abatch system, depending on the contact time, dose biosorbent, and initial pH of the solutionand initial concentration of the solution of Pb (II). To determine the kinetic parameters,experimental data were correlated using three mathematical models (Peudo primer orden,Pseudo second order and Elovich). The experimental equilibrium data were correlated usingtwo-parameter models: Langmuir and Freundlich; model that best adjusted was the Langmuir.The influence of competing ions observing a decrease in the percentage of biosorption of Pb(II) was studied. The MRLZ has a maximum capacity of monolayer biosorption 7,9 mg /g. Itwas possible to remove 97% of the Pb (II) content in mine wastewater.