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Issue 11, 2020
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Removal of arsenic(iii) from water by 2D zeolitic imidazolate framework-67 nanosheets

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Ultrathin two-dimensional (2D) porous materials, which can efficiently capture harmful pollutants from aqueous solutions are highly desired yet scarcely reported. Herein, 2D zeolitic imidazolate framework-67 porous nanosheets (ZIF-67-NS) were first applied as a promising adsorbent for arsenic(III) removal from water. An ultrathin structure was observed for the as-prepared ZIF-67-NS with an average thickness of 1.3 nm. The resulting ZIF-67-NS shows outstanding water stability in alkaline conditions. Owing to the unique dimensionality, ZIF-67-NS exhibited a significantly higher adsorption capacity (516 mg g−1) and faster uptake kinetics (2 h) toward As(III) than its 3D bulk-type counterpart (ZIF-67-NB). The superior adsorption performance in the ultrathin ZIF-67-NS is attributed to the coordinatively unsaturated Co(II) atoms, which are open sites dominating adsorption, as evidenced by X-ray photoelectron and Fourier transform infrared spectroscopy. On the other hand, the phase transformation in ZIF-67-NB was observed from the 3D bulk structure to the 2D layered structure during the As(III) absorption. Lastly, ZIF-67-NS can be efficiently regenerated with few losses in the adsorption capacity after 3 cycles. Overall, this work represents a practical case of As(III) removal by a 2D crystalline porous material and demonstrates its potential for the development of 2D nanomaterial adsorbents.

Graphical abstract: Removal of arsenic(iii) from water by 2D zeolitic imidazolate framework-67 nanosheets

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Supplementary files

Article information

14 Aug 2020
07 Oct 2020
First published
09 Oct 2020

Environ. Sci.: Nano, 2020,7, 3616-3626
Article type

Removal of arsenic(III) from water by 2D zeolitic imidazolate framework-67 nanosheets

P. Zhao, M. Jian, R. Xu, Q. Zhang, C. Xiang, R. Liu, X. Zhang and H. Liu, Environ. Sci.: Nano, 2020, 7, 3616
DOI: 10.1039/D0EN00851F

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