Molecular sieves have been used for the removal of cobalt from acqueous solutions. Metal adsorption increases with increase in initial cobalt concentration,pH decreases with increasing pore diameter and particle size. The equilibrium data well supported by Frundlich, Langmuir, Frundlich-Langmuir, Redlich-Peterson, Lineweaver-Burk isotherms. Final empirical equation has been developed incorporating all the variables of study