Metal-organic frameworks for removal of mercury (II) from water
Yerbolat Kakimov
Department of Chemistry, School of Science and Technology, Nazarbayev University,
Astana, Kazakhstan
Email: [email protected]
Abstract
The pollution from mercury (Hg) represents a major concern, as it can damage brains, livers,
and central nervous system in humans and animals and poses a threat to public health and the
environment. Among adsorbent materials for removal of mercury (II) ions (Hg 2+ ) from water,
metal-organic frameworks (MOFs) are promising adsorption materials for the effective
removal of Hg 2+ from water. However, removal of Hg 2+ from water with MOFs encounters
challenges such as low selectivity in the presence of interfering metals, low adsorption
capacity, and poor recyclability. In this review, three effective ways of enhancement of Hg 2+
removal for specific MOFs were discussed. In [Cu 3 (BTC) 2 (H 2 O) 3 ] n (HKUST-1), thiol-
functionalization demonstrated high adsorption affinity (K d = 4.73×105 mL g −1 ) and high
adsorption capacity (714.29 mg g −1 ) for Hg 2+ adsorption compared to HKUST-1. Furthermore,
the enhancement of Hg 2+ removal property in MIL-101 MOF was carried out by incorporation
of In 2 S 3 NPs into cavities of MIL-101. The resulting composite, In 2 S 3 @MIL-101, could
remove 99.95% of the Hg 2+ from water very efficiently within 1 min, achieving the highest
distribution coefficient (2.2 × 107 mL g −1 ). 3 Finally, dispersion of Pt NPs in the Ui-66-NH 2
MOF demonstrated excellent selectivity to Hg 2+ and high adsorption capacity (243.9 mg g −1 ).
References
1. M. McNutt. Science 341. (2013) 1430.
2. F. Ke, L.G. Qiu, Y.P. Yuan, F.M. Peng, X. Jiang, A.J. Xie, Y.H. Shen, J.F. Zhu. J. Hazard. Mater. 196
(2011) 36–43.
3. L. Liang, L. Liu, F. Jiang, C. Liu, D. Yuan, Q. Chen, D. Wu, H.L. Jiang, M. Hong. Inorg. Chem. 57
(2018) 4891–4897.
4. H. Li, H. Liu, J. Zhang, Y. Cheng, C. Zhang, X. Fei, Y. Xian. ACS Appl. Mater. Interfaces 9 (2017)
40716–40725.