Air, water, and food are essential for human survival, but increasing population and industrialization over the past two centuries have led to rising environmental pollution in many regions. This pollution has also affected the quality of air, water, and food. Consequently, there is an urgent need to purify polluted water, particularly due to the presence of heavy metals as common water pollutants. In this study, we focused on the removal of cadmium (Cd) and lead (Pb) from wastewater using a process called biosorption. We employed the leaves of the Phaseolus vulgaris plant as a biosorbent. At a biomass concentration of 0.9 grams, we achieved a significant reduction of 90.56% for cadmium and 58.46% for lead. This purification process occurred within a time frame of 40-50 minutes, with a pH range of 6-7, and at a temperature of 60°C. Our equilibrium modeling revealed that the adsorption process followed the Langmuir model, with high R2 values of 0.9911 mg/g for cadmium and 0.9843 mg/g for lead. The maximum adsorption capacity (q_max) was determined to be 41.49 mg/g for cadmium and 25 mg/g for lead. Overall, our experimental results and modeling data demonstrated that the selected adsorbent effectively removes lead and cadmium metals from wastewater.