The present study investigated the adsorption of fluorides in natural zeolites clinoptilolite-type, sourced in Sonora, Mexico, and modified with Fe. Characterization of the material was carried out along with determination of kinetic parameters varying time and concentration of reagents to calculate maximum adsorption capacity. To determine thermodynamic parameters temperature was varied for accurate characterization of the adsorption process. It was found that the zeolite fixed Fe in its structure without model significant modification, likewise when put in contact with a fluoride solution (F-), it was capable of taking up these ions through adsorption due to the interaction between the sorbato and the pollutant. The kinetics best fit Pseudo-second-order model with Qmax=0.91 mgg-1, therefore it indicates that the process is reversible, spontaneous and endothermic what can favor the reuse of the material.