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  • Title: Adsorption of cerium (III) by HKUST-1 metal-organic framework from aqueous solution.
    Author: Zhao L, Azhar MR, Li X, Duan X, Sun H, Wang S, Fang X.
    Journal: J Colloid Interface Sci; 2019 Apr 15; 542():421-428. PubMed ID: 30771637.
    Abstract:
    Cerium is an important rare earth element (REE), which can be used for many high-tech applications. From the industrial and environmental viewpoints, it is imperative to recover Ce3+ ions from aqueous solution. Herein, HKUST-1 metal-organic framework (MOF) was applied for adsorption and recovery of Ce3+ from aqueous solution. HKUST-1 showed a high adsorption efficiency and remarkable capacity of 353 mg/g at pH = 6. The isotherm, kinetics, effect of pH value and adsorption mechanism of the Ce3+ adsorption process were also studied. The results showed that the adsorption process fitted the Langmuir adsorption model, and the pseudo-second-order model described the kinetics well. The mechanism and reusability in Ce3+ adsorption were systematically investigated by various characterization techniques, suggesting the possible ion exchange between Ce3+ and Cu2+ and the formation of CeO covalent bonding. This work opens up a new way for Ce3+ recovery from water.
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