期刊
JOURNAL OF NANOPARTICLE RESEARCH
卷 19, 期 4, 页码 -出版社
SPRINGER
DOI: 10.1007/s11051-017-3803-0
关键词
Fe3O4; MgAl-LDH; Microsphere; Nanomaterials; Adsorption; Measurement method; Core-shell nanocomposites
资金
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry
- National Natural Science Foundation of China [50872084, 51072124]
- Program for New Century Excellent Talents in University [NCET100605]
In this study, Fe3O4 microspheres were prepared by a hydrothermal method, and then the synthesized Fe3O4 microspheres were used as template to prepare Fe3O4@MgAl-LDH composite microspheres by a coprecipitation process. Morphology, composition, and crystal structure of synthesized nanomaterials were characterized by X-ray powder diffractometry, scanning electron microscopy, and Fourier transform infrared spectroscopy technologies. The composite hierarchical microspheres are composed of inner Fe3O4 core and outer MgAl-LDH-nanoflake layer, and the average thickness of MgAl-LDH-nanoflake is about 70 nm. The adsorption property of the products toward congo red was also measured using UV-vis spectrometer. The result demonstrated that the Fe3O4@ MgAl-LDH composite adsorbent could remove 99.8% congo red in 30 min, and the maximum adsorption capacity is about 404.6 mg/g, while congo red removal rate of pure MgAl-LDH and Fe3O4 are only 86.3 and 53.1% in 40 min, respectively, and their adsorption capacity are 345.72 and 220.56 mg/g, respectively. It indicates the composite Fe3O4@ MgAl-LDH nanomaterials have better adsorption performance than pure Fe3O4 and MgAl-LDH nanomaterials. In addition, the magnetic nanocomposites could be separated easily, and it demonstrated good cycle performance.
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