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• W4387308959 abstract "Herein, the diamino-functionalized UIO-66-DABA is constructed by introducing coordination defects of 3,5-diaminobenzoic acid (DABA) as the metal–organic framework (MOF) linkers, which are systematically characterized by scanning electron microscopy, 1H nuclear magnetic resonance, and Brunauer–Emmett–Teller analysis. The powder X-ray diffraction and thermogravimetric analysis results show that it exhibits excellent thermal stability and acid stability. Importantly, the adsorption experiments show that UIO-66-DABA has high selectivity and excellent adsorption performance (713 mg/g) for Hg2+. The adsorption data, including isotherms and kinetics, are well-matched with both Langmuir and pseudo-second-order models. Thermodynamic analysis reveals that the adsorption process is spontaneous, disordered, and exothermic. It is observed that the adsorption of a low concentrations of Hg2+ (20 μg/L) can reach drinking standards within 8 h. The recyclable usage of UIO-66-DABA for the removal of Hg2+ makes it potentially useful for industrial applications. Furthermore, the density functional theory results and molecule dynamics simulations further explore the interactions and conformational relationships between Hg2+ and MOFs (UIO-66, UIO-66-(NH2)2, and UIO-66-DABA). Among these, the lone electron pair on the amino nitrogen plays the key role in the selective adsorption for Hg2+. Additionally, the DABA ligand’s large vibrational amplitudes induce an increased breathing effect within the MOF structure, thereby facilitating the rapid entry of Hg2+ into the pores. As such, our work provides a novel strategy that can regulate the adsorption selectivity and adsorption efficiency of heavy metal ions by MOFs via introducing coordination defects." @default.
• W4387308959 created "2023-10-04" @default.
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• W4387308959 date "2023-10-03" @default.
• W4387308959 modified "2023-10-15" @default.
• W4387308959 title "Enhanced Breathing Effect of Nanoporous UIO-66-DABA Metal–Organic Frameworks with Coordination Defects for High Selectivity and Rapid Adsorption of Hg(II)" @default.
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• W4387308959 doi "https://doi.org/10.1021/acsanm.3c03688" @default.
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