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Highly effective and selective recovery of Gd(III) from wastewater by defective MOFs-based ion-imprinted polymer: Performance and mechanism.
- Source :
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Chemical Engineering Journal . Oct2023, Vol. 474, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
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Abstract
- • Defective UiO-66-NH 2 -supported ion imprinted polymers were developed. • The G-IIP-3 exhibits excellent adsorption capacity and selectivity for Gd(III). • 2-hydroxyphosphonoacetic acid was used as the functional monomer and defective linker. • The phosphate groups and Zr-O clusters contribution to the Gd(III) adsorption on G-IIP-3. Developing a high-performance adsorbent for the recovery of Gd(III) from wastewater is of great environmental and economic significance. Metal organic frameworks (MOFs) functionalized with mixed-linker defect strategy hold huge potential for use as adsorbents for removing heavy metal ions from wastewater. However, the defective MOFs still show a relative low selectivity to target metal ions. Herein, we propose the combination of surface-imprinting and defect engineering strategies to synthesize Gd(III) ion-imprinted polymers (G-IIPs) based on mixed-linker Zr-MOFs, and apply them for capturing Gd(III) ions from wastewater. It is worth noting that 2-hydroxyphosphonoacetic acid not only served as monodentate ligand to in-situ induce ligand vacancies and form hierarchical pores on UiO-66-NH 2 , but also as high-efficient functional monomer in imprinted layer to provide the strong coordination ability towards Gd(III). Benefiting from its abundant binding sites and hierarchical pore structure, the as-prepared G-IIP-3 with rich defects displays a high adsorption capacity of 181.75 mg·g−1 and a short equilibration time of 30 min for Gd(III). In addition, G-IIP-3 presents highly selective capture of Gd(III) over interfering ions. Furthermore, density functional theory calculation demonstrates that both phosphate group and Zr-O cluster play key roles in the Gd(III) adsorption process. Thus, this work provides an effective method to develop high-performance materials for Gd(III) recovery by organically combining the advantages of surface-imprinting and defect engineering strategies. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13858947
- Volume :
- 474
- Database :
- Academic Search Index
- Journal :
- Chemical Engineering Journal
- Publication Type :
- Academic Journal
- Accession number :
- 172844544
- Full Text :
- https://doi.org/10.1016/j.cej.2023.145782