Abstarct: In this study for the first time, the removal of lead (II) ion was investigated using modified pine cone with meldram's acid from effluent . This study reports the potential use of meltram's acid modified pine cone (MPC) to remove lead ions. The physicochemical properties of pine cones were determined before and after modification with meldram's acid using the FT-IR, XRD, FESEM and EDX techniques. several series of discontinuous experiments, were done and the optimal value's such as contact time, pH, adsorbent value, lead solution concentration and temperature were determined discontinuous. Experimental data were fitted by four different isotherm models including Longmoir, Frondelich, Dubinin-Radushkich, and Tamkin. baxsed on the obtained results, the highest correlation coefficient corresponded to the isothermal Langmuir was equal to 0.9989 and the maximum adsorption capacity of the absorber is 416.67 mg/g at temperature 298 K and a value of R2 =0.9747 $ for the Dobinin- Radushkovich isotherm . It can be stated that the process of surface adsorption follows the Langmuir and Dobinin- Radushkovich isotherm. Three adsorption kinetic models include pseudo-first order, pseudo-second order and intra-particle diffusion were used to analyse experimental data. The second-order model showed a better descxription of the laboratory data. Thermodynamic parameters such as ∆H , ∆S and ∆G were also examined, describing the results of heater absorption, disorder increase in adsorbent surface, and spontaneous surface adsorption process. َAlso Absorbent recovery studies were performed to evaluate the potential for adsorption reconstruction using HCl, HNO3 and Na2-EDTA in three cycles. baxsed on these findings, MPC can be used as a low-cost, environmentally friendly and effective adsorbent for water treatment