Abstract
The adsorption properties of calcined layered double hydroxide (denoted as CLDH) for phosphate and desorption for recovery phosphate were examined. The influences of chemical composition of adsorbents, adsorbent dose, and co-existing anions on the phosphate removal have been investigated. It has been found that the LDHs with Mg/Al molar ratio of 2 represented the highest capacity to remove phosphate from aqueous solution. Phosphate ion removal in presence of other ions decreases in the order CO3 2− < SO4 2− < F− < Cl−. Phosphate adsorbed on the CLDH was effectively desorbed at Na2CO3 solution and the CLDH were reconstruction to LDHs at the same time. Phosphate in the exhausted desorption solution was recovered as calcium phosphate by precipitation with Ca2+.
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