Facile Synthesis of the Magnetic Metal Organic Framework Fe 3 O 4 @UiO-66-NH 2 for Separation of Strontium

A magnetic metal organic framework (MMOF) was synthesized and used to separate Sr 2+ in aqueous solution. The shape and structure of prepared Fe 3 O 4 @UiO-66-NH 2 were characterized, and the absorbed concentration of strontium was determined through inductively coupled plasma mass spectrometry. The results indicated that Fe 3 O 4 and UiO-66-NH 2 combined through chemical bonding. The experimental adsorption results for separation of Sr 2+ in aqueous solution indicated that the adsorption of Sr 2+ to Fe 3 O 4 @UiO-66-NH 2 increased drastically from pH 11 to pH 13. The adsorption isotherm model indicated that the adsorption of Sr 2+ conformed to the Freundlich isotherm model ( R 2 = 0.9919). The MMOF thus inherited the superior qualities of magnetic composites and metal organic frameworks, and can easily be separated under an external magnetic field. This MMOF thus has potential applications as a magnetic adsorbent for low level radionuclide 90 Sr.