The linearised form of Freundlich adsorption isotherm was used to evaluate the sorption data. The values of 1/n ranged
between 0.342 and 0.693 which indicates good adsorption (Table 1). According to Kadirvelu and Namasivayam (2000), n
values between 1 and 10 represent beneficial adsorption.The magnitude of K and n shows easy separation of heavy metal ion from wastewater and high adsorption capacity (Ahalya et al.,
2005). The value of n, which is related to the distribution of
bonded ions on the sorbent surface, was found to be greater
than unity indicating that adsorption is favorable. Tien (2002)
found that the magnitude of K and n showed easy uptake of
surface area and dry weight of algal cells. It was found to be the
main factor influencing metal sorption and indicates favorable
adsorption. For Cd, Pb and Co Freundlich model fitted
satisfactorily as depicted by high values of correlation coefficients