m kargar razi - Dep.Chem.Azad Univ.,North BranchTehran,Iran
m Seyed Sajadib - Dep.Chem.Shahid Beheshti Univ.,Tehran,Iran
m Mahmoudian - Dep.Chem.Azad Univ.,North BranchTehran,Iran

Zeolites are alumina- silicate materials with properties to attract positive-charged ions and, therefore, are widely used sequestration of cationic pollutants. Surface –modified zeolite materials have been developed from commercial zeolites by treating them with surface modifiers like heaxdecyltrimetyl ammonium bromide and tetra methyl ammonium bromide, cetyl pyridinium chloride, Dodecyl trimethyl ammonium bromide and tetradecyl trimethyl ammonium chloride as tailoring agents. The adsorbent has been evaluated for removal of chromate anion from industrial waste water and aqueous solutions. Obtained data from chromate adsorption was shown that adsorption for modified zeolites A and Clinoptilolite using the quarternary amine was more than of natural clinoptilolite.

clinoptilolite, chromate ion, waste water, tailoring agent, zeolite-A