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Kim, YK; Kim, Y; Kim, S; Harbottle, D; Lee, JW (2017)
Publisher: Elsevier
Languages: English
Types: Article
Potassium copper hexacyanoferrate-embedded poly(vinyl alcohol)-citric acid hydrogel film (HPC) was prepared via a two-step method of Cu immobilization, followed by the diffusion of potassium hexacyanoferrate accelerated by acetone evaporation. The diffusion-derived KCuHCF formation in the preformed hydrogel facilitated the preservation of the 3D-interconnected hydrogel structure and dispersion of the KCuHCF nanoparticles. Using acetone as a non-solvent, reverse diffusion of the incorporated Cu in the hydrogel matrix was hindered; hence a large amount of KCuHCF was loaded in the matrix. The HPC exhibited substantially enhanced Cs+ removal properties in terms of adsorption capacity, kinetics and selectivity. From the adsorption isotherm, the HPC showed a very high Cs+ uptake of 667 mg/g KCuHCF. Moreover, the adsorbent revealed stable and high Cs+ removal efficiency of 99.9% across a wide pH range from 2 to 10. The kinetics of Cs+ removal was remarkably rapid with 99.5% removal achieved within 30 min from a dilute Cs+ solution (9.18 ppm). When using seawater, the HPC exhibited almost unaltered Cs+ removal efficiency above 99.5%, and high distribution coefficient Kd value of 7.7 × 105 ml/g at an extremely low Cs+ concentration (0.67 ppm, V/m = 1000 ml/g), which highlighted the tremendous affinity for Cs+.
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    • [3] T. Vincent, C. Vincent, Y. Barre, Y. Guari, G. Le Saout, E. Guibal, Immobilization of metal hexacyanoferrates in chitin beads for cesium sorption: synthesis and characterization, Journal of Materials Chemistry A 2 (2014) 10007-10021.
    • [4] R. Chen, H. Tanaka, T. Kawamoto, M. Asai, C. Fukushima, M. Kurihara, M. Ishizaki, M. Watanabe, M. Arisaka, T. Nankawa, Thermodynamics and mechanism studies on electrochemical removal of cesium ions from aqueous solution using a nanoparticle film of copper hexacyanoferrate, ACS Appl Mater Interfaces 5 (2013) 12984-12990.
    • [5] C. Delchet, A. Tokarev, X. Dumail, 99.57 99.66 99.87
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    The results below are discovered through our pilot algorithms. Let us know how we are doing!

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