期刊
ENVIRONMENTAL POLLUTION
卷 242, 期 -, 页码 1-11出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2018.06.031
关键词
Carbonaceous nanofiber; Layered double hydroxide; Heavy metal ion; Sorption; Density functional theory calculation
资金
- National Key Research and Development Program of China [2017YFA0207002]
- National Natural Science Foundation of China [21577032, 21607042, 21777039]
- Fundamental Research Funds for the Central Universities [2018MS114, 2018ZD11, 2016MS02, 2017YQ001]
- Jiangsu Provincial Key Laboratory of Radiation Medicine and Protection
- Priority Academic Program Development of Jiangsu Higher Education Institutions
Heavy metal pollution of water sources has raised global environmental sustainability concerns, calling for the development of high-performance materials for effective pollution treatment. Herein, we report a facile approach to synthesize carbonaceous nanofiber/Ni-Al layered double hydroxide (CNF/LDH) nanocomposites for high-efficiency elimination of heavy metals from aqueous solutions. The CNF/LDH nanocomposites were characterized by three-dimensional architectures formed by the gradual self-assembly of flower-like LDH on CNF. The nanocomposites exhibited excellent hydrophilicity and high structural stability in aqueous solutions, guaranteeing the high availability of active sites in these environments. High-efficiency elimination of heavy metal ions by the CNF/LDH nanocomposites was demonstrated by the high uptake capacities of Cu(II) (219.6 mg/g) and Cr(VI) (341.2 mg/g). The sorption isotherms coincided with the Freundlich model, most likely because of the presence of heterogeneous binding sites. The dominant interaction mechanisms consisted of surface complexation and electrostatic interaction, as verified by a combination of X-ray photoelectron spectroscopy and Fourier-transform infrared spectroscopy analyses and density functional theory calculations. The results presented herein confirm the importance of CNF/LDH nanocomposites as emerging and promising materials for the efficient removal of heavy metal ions and other environmental pollutants. (C) 2018 Elsevier Ltd. All rights reserved.
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