Abstract
Binary Zr-Fe hydroxides with Zr/Fe molar ratios of 0.33, 1.0 and 3.0 were synthesized by a co-precipitation method at room temperature. The materials are amorphous with high surface area (189-220 m2 g-1) . Phosphate adsorptive properties of the materials were investigated by a batch method. Distribution coefficients (Kd) of oxo-anions at pH 9 from a mixed anion solution show the selectivity sequence as follows: Cl-, NO3-, SO42- < HPO42-. The phosphate uptakes from a single electrolyte at pH 2 are 75 mg-P g-1 for the present material, 50 mg-P g-1 for amorphous ZrO (OH) 2·1.5H2O, and 28 mg-P g-1 for low crystalline akaganeite (FeOOH·H2O) . The results suggest that binary Zr-Fe hydroxide can act as phosphate adsorbent.
