SYNTHESIS OF Mg-Al HYDROTALCITE FOR ADSORPTION OF Pb2+ IN WATER

Abstract

Hydrotalcite was synthesized using the co-precipitation method with the Mg/Al molar ratio of 3.0 and then calcined at 450 °C for 5 h. The solid obtained was characterized with XRD and BET. The synthesized hydrotalcite material owns a large surface area of 309.03 m²·g^–1 and a mean capillary diameter of 11.57 nm. Hydrotalcite was utilesed an as adsorbent of Pb²⁺ in water. The absorption equilibrium was attained after 90 minutes at pH 5 with a maximum adsorption capacity of 144.93 mg·g^–1. The synthesized adsorbent could be regenerated with a HNO₃ (1 M) solution and used eight times with the capacity remained unchanged and reaches 92.11 % Pb²⁺ removal.