This research prepared an adsorbent surface of green mint plants, subjected to chemical and physical activation and combined with a resinous substance (4-aminophenol-formaldehyde). The surface was characterized using techniques (X-ray, SEM, FT-IR), and this surface was applied to the removal of potassium permanganate by adsorption process at a (λmax = 545 nm). The best concentration of Malachite green was determined, and it was found that the best concentration is 0.01 mg/L, the best adsorbent surface weight is 0.05gm, the best time is 45 min, and the best temperature is 303 K. The best permanganate removal percentage determined these quantities, and the equilibrium constant was also found. For the adsorption process and finding the thermodynamic functions, it was found that the value of the enthalpy is (−26.881 kJ), which is a process that produces heat and Adsorption of the physical type. As for Gibbs, free energy is an automatic process because its negative sign, and the process is random for entropy because is negative sign. Freundlich and Lankmeyer isotherms were also applied, and it was found that the adsorption process follows the Freundlich isotherms.