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NH2‑MIL-53(Al) Metal–Organic Framework as the Smart Platform for Simultaneous High-Performance Detection and Removal of Hg2+

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journal contribution
posted on 11.09.2019 by Liang Zhang, Jing Wang, Ting Du, Wentao Zhang, Wenxin Zhu, Chengyuan Yang, Tianli Yue, Jing Sun, Tao Li, Jianlong Wang
The worsening pollution due to mercury species makes it inevitable to explore prospective versatile materials, which not only can detect mercury ions (Hg2+) with high sensitivity but also possesses efficient capture and removal ability. In this study, a series of classic organic ligand-based luminescence MOFs materials with high oxidation state central metals (Al3+, Zr4+, Cr3+, Fe3+, and Ti4+) were synthesized and were screened to achieve simultaneously Hg2+ detection and removal through the strong coordination of amino groups or nitrogen centers with Hg2+ and the intrinsic fluorescence intensity of MOFs regulated by the ligand-to-metal charge transfer (LMCT) effect. Among these checked materials, NH2-MIL-53­(Al) exhibited the excellent ability for Hg2+ detection with wide response interval (1–17.3 μM), low detection limit (0.15 μM), good selectivity, wide pH adaptation (4.0–10.0), and strong anti-interference ability. Meanwhile, the resultant NH2-MIL-53­(Al) possessed an efficient removal capability toward Hg2+, accompanied by a fast uptake kinetics (within 60 min) and large loading capacity (153.85 mg g–1). Furthermore, NH2-MIL-53­(Al) also displayed satisfactory stability before and after Hg2+ treatment because of the formation of strong coordination bonds between high oxidation state aluminum (Al3+) and organic carboxylate ligands. Notably, the prepared NH2-MIL-53­(Al) had no significant loss of adsorption performance even after being reused four times. All of these superior properties render the smart NH2-MIL-53­(Al) nanohexahedron a great potential for simultaneous Hg2+ detection and removal from water.