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Hierarchical porous zeolitic imidazolate frameworks nanoparticles (ZIF-8 NPs) were synthesized at room temperature via a template-free approach under dynamic conditions (stirring) using water as a solvent. The ZIF-8 NPs were evaluated as adsorbents for rare earth elements (La 3+ , Sm 3+ and Dy 3+ ). Adsorption equilibrium was reached after 7 h and high adsorption capacities were obtained for dysprosium and samarium (430.4 and 281.1 mg g −1 , respectively) and moderate adsorption capacity for lanthanum (28.8 mg g −1 ) at a pH of 7.0. The high adsorption capacitiese, as well as the high stability of ZIF-8 NPs, make the hierarchical ZIF-8 materials as an efficient adsorbent for the recovery of La 3+ , Sm 3+ and Dy 3+ from aqueous solution.
Abdel‐Magied et al. (Thu,) studied this question.