The adsorption kinetics is influenced by various factors, which include initial heavy metals concentration, amount of adsorbent and time. The initial heavy metals concentration is one of the most important factors that determines the equilibrium concentration, but also determines the uptake rate of heavy metals and the kinetic character. The types of adsorbents for the removal of Ni (II) and Co(II) and their maximum adsorption capacities are shown in Table 1.