IntroductionHeavy metals are considered as primary pollutants due to its toxicity and mobility in natural water system. Among the various heavy metals, cadmium is considered as extremely toxic and carcinogenic to human beings. Cadmium is non-biodegradable heavy metal persists in environment for a long time causing harmful effects to aquatic ecosystem even at a very low concentration in water [1,2]. In natural water bodies, the major anthropogenic sources of cadmium contamination that include discharge of wastes and effluent from industries such as metallurgical processes, electroplating, plastics manufacturing, battery manufacturing, pesticide and fertilizer industry and mines [3,4]. Past events like Itai-Itai disease at Toyama Prefecture in Japan showed the extent of health effects due to the contamination of cadmium in water [5]. The cadmium contamination also causes the health effects for instance high blood pressure, bone fraction, destruction of RBCs, reproductive toxicity, hepatic effects and immunological effects [6,7]. The permissible limit of cadmium in drinking water is 0.003 mg/L as guided by World Health Organization (WHO) [8].Several treatment technologies are available for removal of cadmium from water like chemical precipitation, reverse osmosis, ion exchange, membrane filtration, electrolysis etc.[9] but these treatment technologies have found to be expensive, high chemical demanding and least efficient to remove cadmium at low initial concentration. In recent years, biosorption is found to be a promising method than that of other methods as it is non-expensive, easily operational, regenerable and ecofriendly method [10][11][12][13]. Removal of cadmium at low initial concentration has wide applications for treatment of cadmium contaminated water and can effectively acts as a finishing treatment in effluent treatment plants to reduce cadmium level bellow discharge limits of stipulated standards.Various types of agricultural waste materials like rice husk, sugarcane bagasse, saw dust, brazil nutshell, grape stack, mango peels and coconut copra meal etc. are studied as an adsorbent for removal of cadmium and other heavy metal ions from water and waste water [5,12,14]. In literature, it is reported that functional groups like carboxyl, hydroxyl, phosphate, thio and amino present on the walls of agricultural waste AbstractThe use of Dried banana peels as an adsorbent for removal of cadmium ions from aqueous solutions has been studied. Batch experiments have been conducted at different concentrations to evaluate the maximum adsorption capacity of Dried banana peels. The influence of pH, contact time, adsorbent dose was investigated at room temperature. Langmuir and Freundlich adsorption isotherm models used to test equilibrium of adsorption. The process of adsorption was found to be fast and equilibrium has been reached in within 2 hours. The maximum adsorption capacity of cadmium on Dried banana peels is 5.91 mg/g, evaluated by Langmuir adsorption isotherm model. Pseudo-first-order and pseudo-second-...