期刊
WATER SCIENCE AND TECHNOLOGY
卷 76, 期 11, 页码 2867-2875出版社
IWA PUBLISHING
DOI: 10.2166/wst.2017.412
关键词
adsorption; CeO2-functionalization; magnetic adsorbent; phosphate
资金
- Natural Science Foundation of China [21407074, 51508080, 41430752]
- China Postdoctoral Science Foundation [2015M571832]
- College Natural Science Foundation of Jiangsu [15KJB610010, 16KJB150025]
Phosphate is generally considered to be one of the nutrients for plants which may cause eutrophication of the aquatic environment. In this study, a CeO2-functionalized Fe3O4@SiO2 core-shell magnetic nanomaterial (denoted as Fe3O4@SiO2-CeO2) was prepared and used as the adsorbent to remove phosphate from water. The adsorbents were characterized by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and N-2 adsorption/desorption isotherms. Characterization results show that the particle size is around 8.63 nm, Brunauer-Emmett-Teller (BET) surface area is 179.7 m(2).g(-1) and the pore volume is 0.39 cm(3).g(-1) for magnetite Fe3O4@SiO2-CeO2. The adsorbents could be rapidly separated under an external magnetic field. Batch adsorption tests show that the Fe3O4@SiO2-CeO2 adsorbent exhibited high adsorption affinity for phosphate. Additionally, phosphate adsorption isotherms over the adsorbents could be well described by the Langmuir model, suggesting monolayer adsorption, and phosphate adsorption kinetics followed the pseudo-second-order kinetics. Moreover, increasing pH led to suppressed phosphate adsorption, and phosphate adsorption slightly increased with ionic strength.
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