Magnetic copper hexacyanoferrate core–shell nanoparticles for effective cesium removal from aqueous solutions. Issue 4 (17th February 2023)

• Record Type: Journal Article
• Authors: Wang, Yihui; Li, Fenghua; Mao, Jiali; Wang, Xiaomin; Shao, Yong; Yuan, Junhua
• Is Part Of: Environmental science. Volume 9:Issue 4(2023)
• Page Start: 1115
• Page End: 1123
• Publication Date: 2023-02-17
• Subjects: Water-supply -- Periodicals; Water security -- Periodicals; Water resources development -- Periodicals; Water chemistry -- Periodicals; 553.705
• DOI: 10.1039/d2ew00712f
• Languages: English
• ISSNs: 2053-1400

Abstract

Abstract : Selective and efficient removal of Cs + ion by CuHCF@Fe3 O4 nanoparticles and their regeneration can be controlled by modulating the redox state of CuHCF on Fe3 O4 nanoparticles. The CuHCF@Fe3 O4 nanoparticles can be easily recollected by magnet. Abstract : The commercial operation of nuclear power remains a challenge due to the contamination of 137 Cs in the release of radioactive waste. Herein, we developed an efficient strategy of ion exchange for the selective adsorption and magnetic recovery of Cs in the solution based on copper hexacyanoferrate (CuHCF) deposited on Fe3 O4 nanoparticles (NPs). The superparamagnetic CuHCF@Fe3 O4 NPs will make it easier to be separated from the solution. In addition, the diffusion of alkali ions in the CuHCF lattice can be controlled by modulating the chemical valence of iron centers in CuHCF. In the reduced type, CuHCF@Fe3 O4 NPs possess a high Cs adsorption capacity of up to 273 mg g −1 in 500 mg L −1 CsCl solution. Even in the presence of an alkaline ion, CuHCF@Fe3 O4 NPs exhibit a high Cs selectivity of 0.2 L mg −1 as well as a high Cs removal efficiency of 98% in 100 g L −1 NaCl solution. The excellent Cs removal performance of CuHCF@Fe3 O4 NPs can be comparable to or was even better than that shown by most of the transition-metal hexacyanoferrates reported recently. Moreover, CuHCF@Fe3 O4 NPs were favorably stable with a Cs removal efficiency of 74% after 100 loops of adsorption and regeneration.