2012 Volume 38 Issue 5 Pages 329-333
Zirconium(IV), which has strong affinity for phosphate ions, was loaded to zeolite for the adsorption and a removal of phosphate ions. At saturation, the amount of zirconium loaded to zeolite reached 1.20 mol/kg. Adsorption of phosphate ions by the zirconium-loaded zeolite was 100% in the range of pH 2–4. At above pH 4, the percentage adsorption decreased. At pH 7, the capacity of Zr-zeolite to adsorb phosphate ions was 0.65 mol/kg, while that of H-zeolite was 0.13 mol/kg. Adsorption of phosphate ions in secondary effluent containing other ions was fast and selective.