where b is the Langmuir constant and C0 the initial heavy metals concentration (mg/L). RL value indicates the type of isotherm. According to McKay et al. (1982), RL values between 0 and 1 indicate favorable adsorption (Tab. 2). R2(correlation coefficient) values approaching to one, clearly suggest that Langmuir isotherm holds good to explain adsorption of Ni(II) and Co(II) on Banana peel. Banana peel have high removal efficiency for Co(II) as compared to Ni(II). KF (ultimate adsorption capacity), as calculated from Freundlich isotherm is 1.98 for Ni(II) and 2.47 for Co(II). R2 values given in Table 1, indicate that isotherm holds good for Ni(II) and Co(II).