Binary Zr-Fe Hydroxide as Phosphate Adsorbent
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概要
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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 m<SUP>2</SUP> g<SUP>-1</SUP>) . Phosphate adsorptive properties of the materials were investigated by a batch method. Distribution coefficients (<I>K</I><SUB>d</SUB>) of oxo-anions at pH 9 from a mixed anion solution show the selectivity sequence as follows: Cl<SUP>-</SUP>, NO<SUB>3</SUB><SUP>-</SUP>, SO<SUB>4</SUB><SUP>2-</SUP> < HPO<SUB>4</SUB><SUP>2-</SUP>. The phosphate uptakes from a single electrolyte at pH 2 are 75 mg-P g<SUP>-1</SUP> for the present material, 50 mg-P g<SUP>-1</SUP> for amorphous ZrO (OH) <SUB>2</SUB>·1.5H<SUB>2</SUB>O, and 28 mg-P g<SUP>-1</SUP> for low crystalline akaganeite (FeOOH·H<SUB>2</SUB>O) . The results suggest that binary Zr-Fe hydroxide can act as phosphate adsorbent.
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