Industrial activity generates huge amounts of waste, whose storage can lead to serious problems of groundwater pollution by infiltration of landfill leachates. Geomaterials used as water barriers may be a solution to this problem. This work is devoted to the elaboration of new geomaterials based on Algerian clay, activated carbon, cement, and polymer for containment of stored waste and the study of their performances towards inorganic pollutants. Thus we elaborated a set of three geomaterials GM1, GM2, and GM3 with various clay and activated carbon contents and whose polymer and cement compositions are maintained constant. The higher clay content (80%) was used in preparing GM1.The retention properties towards lead were assessed by the adsorption isotherms of geomaterials and their minerals constituents. The study of lead adsorption isotherms on geomaterials showed mainly that GM1, with the highest clay and lowest activated carbon contents and with the highest specific surface area, is very effective for trapping lead. Moreover, its adsorption capacity is pH-dependant; the highest Pb2+ amount adsorbed is obtained for pH12. On the other hand, it has been shown that the retention of lead is a result of the components contribution: clay, activated carbonm and cement.