<p>In this work, an attempt has been made to coat the Potamogeton Crispus macrophyte on magnetite nanoparticles (MNPs) to study their performance for the removal of methylene blue dye from wastewater. The adsorption study was carried out at 298 K to 308 K. The MNPs were characterized using BET surface area analysis, XRD and FTIR spectroscopy. The study has also examined the effects of adsorbent dose, dye concentration, pH and contact time on methylene blue removal. Increasing the adsorbent dose from 0.02 g to 0.1 g enhanced the dye removal efficiency, and the maximum methylene blue dye removal efficiency is found to be 60.4 % at the adsorbent dose of 0.1 g. The effect of initial concentration was analyzed for removal of methylene blue by increasing its concentration from 2 to 10 ppm and the removal efficiency has been observed as 72.6% for a 10 ppm solution. Similarly, as the pH increased from 2 to 10, the dye removal efficiency observed as 86.2% at pH 10. Finally, the effect of contact time revealed that longer durations led to higher removal efficiency, with a maximum of 89.1% observed at 12 hours. The adsorption data were analyzed using the Freundlich model, which suggests the formation of a monolayer. Kinetic studies reveal that the adsorption followed a pseudo-second-order (PSO) model with R² values of 0.94 for PSO and 0.978 for the Freundlich isotherm, indicating a good fit to the experimental data.</p>