It is a known fact that one of the indispensable elements of life is high-quality drinkable water. With climate change and global warming, the increase in water consumption in certain sectors and the irregular distribution of population density negatively affect water quality. Wastes resulting from agricultural and food production activities and wastes generated from household use have structurally similar characteristics. These wastes contain active components and functional groups that can be used in both water/wastewater treatment and the medical/cosmetic sectors. Although it is a very diverse type of waste, the waste of banana fruit, which is consumed extensively all over the world, has been used in water treatment. In this study, banana peels (BnP) discarded as waste were used in powder form to remove Cd⁺² from the synthetic solution. Cd⁺² ion is a toxic and bioaccumulative heavy metal commonly found in industrial wastewater. Therefore, this method was chosen due to the simple design of adsorption. For evaluation, at a constant mixing speed (150±5 rpm) and 100±3 mg/L Cd⁺² dose, the effects of pH (2, 4, 6, and 8), contact time (5, 15, 30, 45, 60, and 90 minutes), BnP dose (0.1, 0.5, 1.0, 2.0, 3.0, and 5.0 g), and temperature (20, 25, 30, and 35 ⁰C) were examined. For adsorption efficiency, Langmuir and Freundlich isotherms, and pseudo-first and second-order kinetics were tested. The experimental results showed that a 70% to 85% efficiency was achieved under optimum conditions for the Cd⁺² removal of BnP.