Adsorption of cerium (III) by HKUST-1 metal-organic framework from aqueous solution
Journal of Colloid and Interface Science
Academic Press Inc.
School of Engineering
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 Ce 3+ ions from aqueous solution. Herein, HKUST-1 metal-organic framework (MOF) was applied for adsorption and recovery of Ce 3+ 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 Ce 3+ 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 Ce 3+ adsorption were systematically investigated by various characterization techniques, suggesting the possible ion exchange between Ce 3+ and Cu 2+ and the formation of Ce–O covalent bonding. This work opens up a new way for Ce 3+ recovery from water. © 2019