Research on adsorption of Zn2+ by hydroxyapatite/Chitosan nanocomposite

Abstract

Hydroxyapatite/chitosan nanocomposite (n-HAp/ChS) was synthesized by chemical precipitation method from 0.5 M Ca(NO3)2 + 5 % chitosan/2 % acetic acid solution and 0.3 M (NH4)2HPO4 solution at pH 10-11 using 28 % NH3 solution for the adsorption of Zn2+ from aqueous solution. The effect of factors on the Zn2+ adsorption efficiency and capacity was investigated. The adsorption efficiency and capacity obtained 96.3 % and 19.26 mg/g respectively at optimal condition: pH 6.3, n-HAp/ChS mass of 3 g/L, initial concentration of 20 mg/L Zn2+, contact time 30 minutes at room temperature (30oC).