Abstract: The utilization of renewable and cost-effective biomass for the production of activated carbon represents an innovative approach to environmental remediation.In this work, environmentally friendly carbon materials derived from cocopeat were employed to create a cocopeat-based magnetic activated carbon (CPAC-Fe3O4) nanocomposite for the removal of mercury from aqueous solutionsThe CPAC-Fe3O4 nanocomposite underwent comprehensive characterization using SEM, FTIR, BET, XRD, and VSM analyses.The optimization process revealed a maximum adsorption capacity of 204.08 mg/g under specific conditions: initial Hg concentration of 20 mg/L, pH of 6, temperature of 25 °C, and adsorbent dose of 0.01 g within 60 min.Isotherm and kinetic modeling exhibited strong agreement with the Freundlich isotherm (0.9749) and pseudo-second-order (0.9997) kinetic models, indicating a favorable chemisorption process.Furthermore, thermodn. anal. suggested that the adsorption process is endothermic and spontaneous.The adsorption mechanism was elucidated based on FTIR anal.The results highlight the CPAC-Fe3O4 nanocomposite as a promising and sustainable candidate for effective water purification