REMOVAL OF PB(II), CD(II), NI(II) AND MIXTURE OF METAL-IONS BY ADSORPTION ONTO WASTE FE(III) CR(III) HYDROXIDE AND FIXED-BED STUDIES/

Adsorption of Pb(II), Cd(II) and Ni(II) onto Fe(III)/Cr(III) hydroxide , a waste material from a fertilizer industry, has been investigated b y batch mode and fixed bed studies. Parameters studied for batch mode tests include particle size, adsorbent dosage and ionic strength. The adsorption of metal ions increased with increase in adsorbent dosage a nd decrease in particle size. The adsorption obeys Freundlich isotherm model. There was no significant effect by changing the ionic strength using NaNO3. Combined metals removal by the adsorbent shows the order of adsorption as Pb(II) > Cd(II) > Ni(II).