A facile synthesis of hierarchically porous Cu-BTC for efficient removal of uranium(VI)
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Metal–organic frameworks (MOFs) are promising adsorbents for extraction of uranium(VI) due to their high surface area and abundant active site. However, the smaller pore size (< 2 nm) and harsh synthesis conditions (e.g., high temperature and pressure) severely hinder MOFs practical applications in some cases. Herein, we developed a simple and facile method to prepare hierarchically porous Cu-BTC that contained micropores, mesopores and macropores. The as-synthesized hierarchically porous Cu-BTC showed high uptake capacity (406.9 mg g−1) and removal efficiency (99.7%) in the capture of uranium(VI) from an aqueous solution. Thermodynamics results indicate the spontaneous nature of uranium(VI) adsorption process onto hierarchically porous Cu-BTC. In addition, Langmuir isotherm and pseudo-second-order models were found to be more suitable in describing the adsorption process of uranium(VI) than those of Freundlich and pseudo-first-order models. These results indicate that hierarchically porous MOFs obtained from rapid room-temperature synthesis are promising adsorbents for the removal of uranium(VI) from aqueous solutions.
KeywordsHierarchically porous Cu-BTC Facile synthesis Uranium(VI) removal High uptake and removal efficiency
CD and JL conceived and designed the study; CD, JL, WQ and CZ, performed the experiment and analyzed the data; PY provided critical feedback and helped shape the research; CD wrote the final version of the manuscript.
This research was funded by the Natural Science Foundation of Hunan Province (Grant No. 2019JJ60003).
Compliance with ethical standards
Conflict of interest
The authors declare no conflict of interest.
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