Biocharmodified with metal oxides has proved high capacities in removing heavy metals in wastewater. The successful coating of Fe-Mn oxide particles on the BC surface was confirmed through EDX and FT-IR spectra. Fe-Mn@BC exhibited a specific surface area 4.34 times higher than that of BC (SFe-Mn@BC= 69.636 m2/g; SBC= 16.03 m²/g), resulting in a maximum adsorption capacity for Pb2+ of 1164.95 mg/g, surpassing BC's capacity of 828.84 mg/g. The optimal conditions for Pb2+ removal by Fe-Mn@BC were an initial Pb2+ concentration of 50 mg/L, an adsorbent amount of 0.01 g, an adsorption time of 60 minutes, and an adsorption temperature of 313 K. The adsorption behavior of Pb2+ on Fe-Mn@BC was well-described by the pseudo second-order kinetic and Freundlich models. This process involved a heterogeneous multilayer mechanism that was both spontaneous and endothermic.The adsorption mechanism comprised intra-particle diffusion and chemisorption interactions, includingco-precipitation, complexation, ion exchange, and hydrogen bonding.  Eichhornia crassipes stem biochar enhanced with iron/manganese binary oxide can efficiently remove Pb2+ from wastewater.