Immobilization of potassium copper hexacyanoferrate in doubly crosslinked magnetic polymer bead for highly effective Cs+ removal and facile recovery

• Published in: Journal of industrial and engineering chemistry (Seoul, Korea) Vol. 68; pp. 48 - 56
• Main Authors: Kim, Yun Kon, Bae, Kyeonghui, Kim, Yonghwan, Harbottle, David, Lee, Jae W.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 25.12.2018; 한국공업화학회
• Subjects: Adsorption; Cesium removal; Hexacyanoferrate; Magnetic recovery; Polymer bead; 화학공학; Hexacyanoferrate; Polymer bead; Cesium removal; Magnetic recovery; Adsorption
• ISSN: 1226-086X; 1876-794X
• DOI: 10.1016/j.jiec.2018.07.028

[Display omitted] •KCuHCF-immobilized magnetic hydrogel was prepared via double crosslinking method.•HCF-Mbead showed a Cs+ adsorption capacity of 69.2mg/g with broad pH stability.•HCF-Mbead exhibited high selectivity for Cs+ even in highly competitive seawater.•HCF-Mbead was easily recovered by a magnet after Cs+ adsorption. A potassium copper hexacyanoferrate (KCuHCF) embedded magnetic hydrogel bead (HCF-Mbead) was synthesized via a facile double crosslinking methods of Fe3+ ionic binding and freeze-thaw for effective Cs+ removal. The HCF-Mbead had a hierarchical porous structure facilitating fast access of Cs+ ions to embedded active sites. The adsorbent showed enhanced Cs+ removal properties in terms of capacity (69.2mg/g), selectivity (Kd=4×104mL/g, 1ppm Cs+ in seawater) and stability (>99.5% removal in pH 3∼11) with rapid magnetic separation. This study further opens the possibility to develop an efficient material that links the integration of adsorption and recovery.