(182n) Effective Immobilization of Potassium Copper Hexacyanoferrate Via Amino-Functionalization of Magnetic Chitosan Adsorbent for Selective Cs+ Separation

With the expansion of the nuclear power plant dismantling market, the treatment of radioactive waste is becoming important. For selective removal of cesium, we demonstrate the immobilization of potassium copper hexacyanoferrate (KCuHCF) nanoparticles in magnetic chitosan adsorbent (HMC). Sequential grafting of methyl acrylate and diethylenetriamine onto the surface of magnetic chitosan enhanced immobilization efficiency of KCuHCF via the coordination of the amino functionality with the copper precursor. As a result, the HMC showed a high cesium adsorption capacity of 136.7 mg g^-1, which was attributed to the effectively dispersed KCuHCF nanoparticles on the surface of adsorbent beads. In addition, the HMC was stable in a wide range of pH (4-11) and exhibited fast removal kinetics to remove 9 ppm Cs⁺ within 2 hours. The HMC was practical enough to remove >97% Cs⁺ in 5 cycles even in wastewater condition of 1 ppm of Cs⁺ dissolved in seawater, and it could be easily recovered by magnets.