Synthesis of an anionic 2D → 3D interpenetration metal–organic framework for efficient removal of Sr2

• Published in: Inorganica Chimica Acta Vol. 569; p. 122128
• Main Authors: Qi, Xiang-Yue, Li, Xiu-Zhen, Diao, Xi-Hui, Muhammad, Yaseen, Chen, Chao, Wang, Hao, Qi, Chuan-Song, Li, Wei, Hong, Ye
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.09.2024
• Subjects: Adsorption; Ion exchange; Metal-organic framework; Nuclear power plants’ waste; Strontium; Strontium; Metal-organic framework; Nuclear power plants’ waste; Adsorption; Ion exchange
• ISSN: 0020-1693; 1873-3255
• DOI: 10.1016/j.ica.2024.122128

An anionic 2D→3D interpenetration metal–organic framework containing [NH4] + ions by the simple solvothermal reaction were obtained, denoted as Cu-Zn-MOF. Systematic studies revealed that Cu-Zn-MOF was an efficient ion exchanger material for the selective capture of Sr2+ ions. [Display omitted] •A 2D → 3D interpenetration metal–organic framework (Cu-Zn-MOF) was synthesized by one-step solvothermal method.•Cu-Zn-MOF exhibited high adsorption capacity (qm = 209.8 mg/g), excellent selectivity and fast kinetics towards Sr2+.•The adsorption mechanisms include ion exchange and coordination adsorption. Rapid removal of radioactive strontium from solutions is of great significance for ecosystem conservation. Herein, a new Cu-Zn-MOF namely, [NH4]3[(Cu3Zn2(FDA)6(H2O)8Cl·3H2O] (Cu-Zn-MOF; H2FDA = 2,5-furandicarboxylic acid) is designed for the efficient adsorption of radioactive Sr2+ by ion exchange. The newly designed Cu-Zn-MOF possessed an anionic 2D → 3D interpenetration framework based trinuclear centers which are charge-balanced by amino cations. Kinetic studies showed that Cu-Zn-MOF rapidly removed Sr2+ (96.7 % in 4 h), and the kinetic data fitted well with the pseudo-second-order model. The adsorption isotherms were well described by Langmuir model and Cu-Zn-MOF exhibited high adsorption capacity (220.7 mg/g at 298 K), out-performing many state of the art adsorbents. More importantly, Cu-Zn-MOF exhibited intriguingly high selectivity for Sr2+ in solutions containing coexisting ions with good reusability. The findings of this study can provide key and useful information for the adsorptive removal of Sr2+ and other similar radioactive material with minimal processing and cost.