Research on column adsorption of Pb2+ by hydroxyapatite granules
Abstract
Hydroxyapatite (HAp) granules were fabricated successfully from HAp powder and polyvinyl alcohol (PVA) additive by sintering method. The characterization of material was analyzed by color, durability in the water, XRD, EDX, SEM and BET. The obtained HAp granules were white, single phase of HAp, with specific surface area of 73 m2/g, size of granule about (2 × 10) mm. HAp granules were used for the removal of Pb2+ ion from aqueous solution. The effect of factors on the Pb2+ adsorption efficiency and capacity was investigated. The adsorption efficiency and capacity were 95.32 % and 4.97 mg/g respectively (for batch adsorption) at suitable condition: HAp granule mass of 6 g/L, initial concentration of 30 mg/L Pb2+, contact time 40 minutes and pH0 5.5 at 30 oC. The removal efficiency was about 99.7 % (for column adsorption) at suitable condition: contact time of 3,1793 min, flow rate of 20 mL/min, adsorption zone height of 4Ф, initial concentration of 30 mg/L Pb2+, pH0 5.5 at 30 oC.
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