期刊
CHEMOSPHERE
卷 199, 期 -, 页码 435-444出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2018.02.019
关键词
Metal-organic frameworks; Magnetic nanocomposites; Heavy metal ion removal; Water treatment; Dye separation and removal; Core-shell structure
资金
- National Natural Science Foundation of China [21575107, 21575108, 21675118]
- Science Fund for Creative Research Groups of NSFC [20921062]
- Large-Scale Instrument and Equipment Sharing Foundation of Wuhan University [LF20170799]
Amino-decorated Zr-based magnetic Metal-Organic Frameworks composites (Zr-MFCs) were prepared by a facile and efficient strategy. The nano-sized Fe3O4@SiO2 core (about 15 nm) was coated with a shell of Zr-MOFs (about 5 nm) by means of in-situ growth. And, Fe3O4@SiO2@UiO-66 and its amino derivatives (Fe3O4@SiO2@UiO-66-NH2 and Fe3O4@SiO2@UiO-66-Urea) were successfully prepared by using different precursors. The obtained Zr-MFCs were demonstrated to be efficient adsorbents for metal ions/organic dyes removal from aqueous solution, with high adsorption capacity and fast adsorption kinetics. It was found that the amine-decorated MFCs were highly efficient for metal ions/dyes removal compared to raw MFC-O. Among them, MFC-N exhibited the highest capacity for Pb2+ (102 mg g(-1)) and methylene blue (128 mg g(-1)), while MFC-O exhibited the highest capacity for methyl orange (219 mg g(-1)). Moreover, anionic and cationic dyes could be selectively separated and removed from the mixed solution just by adjusting the solution pH with Zr-MFCs as the adsorbents. And these Zr-MFCs materials can be easily regenerated by desorbing metal ions/organic dyes from the sorbents with appropriate eluents, and the adsorption capacity can be remained unchanged after 6 recycles. The obtained results demonstrated the great application potential of the prepared MFCs as fascinating adsorbents for water treatment. (C) 2018 Elsevier Ltd. All rights reserved.
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