The sorption of Pb 2+ ions was conducted in a fixed-bed column by using nano-hydroxyapatite granules. The breakthrough and exhaustion time decreased with increasing flow rate, decreasing bed depth and increasing influent lead concentration. The proposed mechanism is a partial dissolution of calcium followed by the precipitation of an apatite by the ion-exchange mechanism with the formula Ca 10−x Pb x (PO 4) 6 (OH) 2 and Pb 10 (PO 4) 6 (OH) 2 .
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