Construction of Core-Shell MOFs@COF Hybrids as a Platform for the Removal of UO22+and Eu3+Ions from Solution

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Abstract

The binary nanocomposites of metal/covalent-organic frameworks (NH2-MIL-125(Ti)@TpPa-1) were constructed by solvothermal method, which was developed as a multifunctional platform with adsorption and photocatalysis for radionuclides removal. The batch experiments and physicochemical property (FT-IR, XRD, SEM, TEM, XPS, etc.) corroborated: (i) core-shell NH2-MIL-125(Ti)@TpPa-1 had a more stable, multilayer pore structure and abundant active functional groups; (ii) NH2-MIL-125(Ti)@TpPa-1 had fast a removal rate, as well as a high adsorption capacity of 536.73 mg (UO22+)/g and 593.97 mg (Eu3+)/g; (iii) the pseudo-second-order and Langmuir model provided a more reasonable description, indicating the immobilization process was endothermic, spontaneous chemisorption; (iv) the adsorption mechanism was chelation and electrostatic attraction, ascribed to the nitrogen/oxygen-containing functional groups. These results illustrated that NH2-MIL-125(Ti)@TpPa-1 was a prospective adsorbent for the remediation polluted by radionuclides. In addition, the research provided the theoretical basis for further investigation on the UO22+(VI) photoreduction.

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Zhong, X., Liu, Y., Liang, W., Zhu, Y., & Hu, B. (2021). Construction of Core-Shell MOFs@COF Hybrids as a Platform for the Removal of UO22+and Eu3+Ions from Solution. ACS Applied Materials and Interfaces, 13(11), 13883–13895. https://doi.org/10.1021/acsami.1c03151

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