Studies on Selective Adsorbents for Oxo-anions. NO3- Adsorptive Properties of Mg-Fe Layered Double Hydroxides
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In a previous study, we reported that the high selectivity for nitrate ion is correlated with the inter layer spacing of layered double hydroxides (LDHs) . In this study, Mg-Fe LDH samples were synthesized by a co-precipitation method at a constant pH 10, followed by hydrothermal treatment at 150 °C. The selectivity sequence from distribution coefficients (K<SUB>d</SUB>) values for Mg-Fe LDH is NO<SUB>3</SUB><SUP>-</SUP>> HPO<SUB>4</SUB><SUP>2-</SUP>> SO<SUB>4</SUB><SUP>2-</SUP>. Nitrate ion exchange capacities are 1.6, 1.8, 1.8, 2.0 and 1.5 mmol g<SUP>-1</SUP> for Mg-Fe LDHs with Mg<SUP>2+</SUP>/ Fe<SUP>3+</SUP> molar ratios of 2, 3, 4, 5 and 6 in parent solution, respectively.
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