Natural clays have played a significant role in the adsorption of water pollutants in recent decades. Clays and their modified forms have been examined extensively for the adsorption of both inorganic and organic pollutants by many researchers. The utilization of sodium montmorillonite and various organically modified forms for ferrous ion adsorption was investigated in this study. In our investigation, adsorption isotherms show the physisorption type of Fe(II) adsorption on sodium montmorillonite while The adsorption of iron ions on the modified montmorillonite with 3-mercaptopropyl trimethoxysilane exhibits mixed physisorption and chemisorption characters. The kinetics of adsorption is best represented by pseudo-second-order for all three clays' samples in our investigation, and the adsorption exhibits mixed Boyd film and intraparticle diffusion processes.