The present composites (NMO/Modified AC) were prepared and utilized for the removal of Pb (П) from waste water through batch adsorption. Nano manganese oxide (NMO) was prepared by simple co-precipitation method / modified activated carbon which treated with HNO3 (4M, 6M and 8M). The synthesized samples NMO, NMO/(4M,6M,8M) AC and AC were characterized using X-Ray Diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and Scanning Electron Microscope (SEM). Batch experiments were carried out under several conditions such as pH, temperature, contact time, competing cation, and initial lead(П) ion concentration to remove lead (П) ions from liquid waste. The results revealed that NMO, NMO / (4M, 6M, 8M) AC, and AC have a high adsorption efficiency (>99%). The adsorption results from the applied experiments fit Langmuir isotherm, and the kinetic data follow pseudo-second-order model. in addition, the evaluation of thermodynamic parameters (∆G°, ∆S° and ∆H°) from Van̕t Hoff equation indicated the spontaneous and exothermic nature of adsorption.