This work evaluated fly ash from a brick-making company, with the aim of analyzing its adsorptive capacity of lead in an aqueous solution. The adsorbent material was supplied by a brick manufacturing company located in the municipality of Cogua, Cundinamarca. Adsorption tests of lead (Pb2 +) in aqueous solution were carried out in batch mode. Initial pH and initial concentration of solute in aqueous solution were analyzed in order to determine their influence on the efficiency of the treatment. This was measured in terms of percentage of lead removal and adsorption capacity. Results show that cv adsorption capacity reached a maximum value of 65.74 mg g-1 when the initial pH of the solution is 4.79 and lead concentration is 200 mg L-1. Additionally, lead removal reached a maximum value of 73.8% under the same conditions. Graphical analysis of experimental results allows observing that pH affects the percentage of lead removal, but not the adsorption capacity of lead reached by the material studied. The analysis of the kinetics of lead adsorption on fly ash led to the results being adjusted to a kinetic model of pseudo second order, whose kinetic coefficient was 0.00396 g mg-1 min-1.