Over the last few years, the pollution due to heavy metals has reached critical levels. It may often end up in ground and surface water short-term poisoning because of its occurrence in aqueous waste streams and soils surrounding many industrial areas. Consequently, the development of advanced methods that can combine high efficiency to remove heavy metal pollutants from waste streams and low cost is needed. In this context, abundant and inexpensive materials such as clays and clay minerals are often implicated. Several substances such as kaolin, montmorillonite and illite are commonly used in order to remove lead, copper, zinc and cadmium from acid aqueous solutions [1-10]. However, if all these materials show a certain activity, the results obtained remain below expectations. Several studies dealing with the sorption of heavy metals on extractant-loaded solid supports have been performed during the last decade with the aim to improve the sorption capacity [11-15]. Surface modification of the latter was shown to be an important feature for developing their practical applications such as fillers and adsorbents. This was obtained by means of intercalation reactions through interlamellar grafting of organic molecules [16-26]. Although organophosphorous and pyrazolone chelating extractants are often used in the liquid-solid extraction process of metals [11, 17 - 18, 27 - 38], any investigation concerning clays functionalized by pyrazolones is not described in the literature. In this work, the solvent extraction reagents DTMPPA and HTMDDP are introduced by the dry impregnation method into a montmorillonite clay previously treated. The obtained sorbents are characterized by infrared spectroscopy, chemical analysis and X-ray diffraction and their behaviors with respect to the extraction of copper from dilute sulfate solutions are compared.