Novel Fluorine-Pillared Metal–Organic Framework for Highly Effective Lithium Enrichment from Brine

• DOI: 10.1021/acsami.1c17080
• Publication Date: 2021-10-01T17:08:07Z
• Authors: Xue Jiang; Ben Wu; Peng Bai; Jiafei Lyu; Xianghai Guo
• Keywords: Endothermic process

The continuously developing lithium battery market makes seeking a reliable supply top priority for technology companies. Although metal–organic frameworks have been extensively researched as adsorbents owing to their exceptional properties, adsorption has scarcely investigated. Herein, we prepared novel cuboid rod-shaped three-dimensional framework termed TJU-21 composed of fluorine-pillared coordination layers Fe–O inorganic chains and benzene-1,3,5-tricarboxylate (BTC) linkages. Besides thermal chemical robustness, remarkably high uptake about 41 mg·g–1 was observed on fast-spontaneous endothermic process. Single-crystal X-ray diffraction demonstrated that the adsorbed located in cavity symmetrically assembled by iron sites organic ligands between adjacent layers, while another kind circled Fe–O–Fe–O–Fe–O–Fe shared BTC linkages occupied hydrogen-bonded water molecules. Lithium resulted decreased curviness binding energy change at O 1s well increased Fe 2p peak, suggested potential interaction with sites. practicability adsorbent further proved considerable capacity selectivity simulated salt brines excellent reusability.