期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 285, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2021.120366
关键词
COF; MgO NPs; Uranium; N-doped carbon; Adsorption; Ions exchange
资金
- National Natural Science Foundation of China [21876047]
- Thousand Talents Plan of Qinghai province
- National Key Research and Development Program of China [2018YFC1900105]
- Science Challenge Project [TZ2016004]
- Beijing Outstanding Young Scientist Program
This paper proposes a COF-absorption-pyrolysis strategy to confine MgO NPs in COF-derived N-doped porous carbon matrix, aiming to treat heavy metals and organic pollutants in wastewater. The experimental results demonstrate that COF-derived MgO@NCt exhibits an efficient removal capacity for U(VI), which can be restored by pyrolyzing.
Nuclear pollution in the environment is increasingly serious recently, which directly endangers human health and environmental quality. Herein, this paper proposes a COF-absorption-pyrolysis strategy to confine MgO NPs in COF-derived N-doped porous carbon matrix. The MgO NPs in the obtained materials were evenly anchored on a carbon matrix with a diameter of less than 10 nm confirming by HRTEM analysis. With the characters of porous structure, large specific surface area, and the evenly loading of MgO NPs, MgO@NCt derived from COF shows a significant removal capacity for U(VI), the removal amounts of U(VI) on MgO@NC400 (389.91 mg/g), MgO@NC500 (947.91 mg/g) and MgO@NC600 (880.60 mg/g) at 298 K were remarkably greater than that of NC500 (180.18 mg/g) and other reported carbon-based materials. Moreover, MgO@NC500 still maintains a high selective removal capacity for U(VI) in the existence of Mg2+, Ca2+, Na+, PO43-, SO42- ions. Characteristic analysis shows that the removal process of U(VI) mainly includes ions exchange, the conversion of MgO to Mg (OH)(2), and the complexation between the high-affinity O-H of Mg(OH)(2) and U(VI). The ultra-high removal capacity of the MgO@NCt can be restored by pyrolyzing, and it is further proved to be an efficient adsorbent. In addition, MgO@NC500 has excellent removal capacity for methylene blue and tetracycline. Therefore, the synthesis strategy of confining MgO NPs in the COF-derived N-doped carbon provides a new insight for the treatment of heavy metals and organic pollutants in wastewater.
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