화학공학소재연구정보센터
Industrial & Engineering Chemistry Research, Vol.58, No.1, 306-315, 2019
Selective Removal of Uranium from Rare Earth Leachates via Magnetic Solid-Phase Extraction Using Schiff Base Ligands
This study highlights a new type of extraction procedure combining a magnetic solid-phase support and a Schiff base ligand for the removal of uranium from rare earth leachates. After synthesizing and characterizing three Schiff base ligands (CH(3)Salen, H(2)Salophen, and MeOSalophen), they were combined with magnetic nanoparticles and assessed for the selective extraction of uranium. To optimize extraction, the effects of parameters such as the pH, the mass of the ligand, and extraction time, were explored. The maximum adsorption capacity for U(VI) using the magnetic MeOSalophen Schiff base was 63 +/- 3 mg g(-1) at pH = 6 with 25 mg of extracting agent for a contact period of 24 h. An acceptable extraction of U(VI) was also observed in more acidic conditions with a shorter extraction period. The magnetic ligand has shown a high selectivity toward U(VI) over a number of metals in a real rare earth element leaching solution.