Adsorptive features of poli(acrylic acid-co-hydroxyapatite) composite for \( {{\text{UO}}_{ 2}}^{{ 2 { + }}} \)

The copolymer of poli(acrylic acid-co-hydroxyapatite) (PAA-HAP) was prepared and characterized by means of FT-IR and SEM analysis. The adsorptive features of PAA-HAP for \( {{\text{UO}}_{ 2}}^{{ 2 { + }}} \) was studied as a function of pH, adsorbent dosage, initial metal ion concentration and temperature. The adsorption isotherm data fitted well to the Langmuir isotherm model. The adsorbed \( {{\text{UO}}_{ 2}}^{{ 2 { + }}} \) can be desorbed effectively by 0.1 M HNO3. The maximum adsorption capacities for \( {{\text{UO}}_{ 2}}^{{ 2 { + }}} \) of the dry PAA-HAP was 1.86 × 10−4 mol/g. The high adsorption capacity and kinetics results indicate that PAA-HAP can be used as an alternative adsorbent to remove \( {{\text{UO}}_{ 2}}^{{ 2 { + }}} \) from aqueous solution.