This study investigated the potential of Pyrolyzed Ficus Benjamina (PF) on the removal of cationic dye, Crystal Violate (CV), by batch biosorption processes. The consequence of contact time and temperature are examined. Characteristics of PF were investigated using Scanning Electron Microscopy (SEM), Energy-Dispersive X-ray spectroscopy (EDX), Brunauer– Emmett–Teller (BET), and Fourier Transform Infrared spectroscopy (FT-IR). The SEM analysis proved the influence of the pyrolysis process on enhancing the Ficus surface morphology by being rough and porous. The FT-IR analysis exposed the attachment of different anion functional groups, principally carboxyl, amino, and hydroxyl groups which mainly connected with the lignin chain and improved CV removal during the biosorption process. The results indicated that the biosorption efficiency of CV reached approximately 97% after 20 min of the contact time. The PF maximum biosorption capacity was 24.19 mg/L PF under the optimum conditions. The pseudo-second-order model provided the best fit to the kinetic model. The thermodynamics results revealed that CV removal using PF is a spontaneous and endothermic process. This study proved that PF is a sustainable and affordable biosorbent for CV removal from industrial outflowing.