期刊
CHEMICAL ENGINEERING JOURNAL
卷 239, 期 -, 页码 114-122出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2013.10.104
关键词
Iron doped ordered mesoporous carbon; Hexavalent chromium; Adsorption; Reduction; Magnetic separation
资金
- Program for the Outstanding Young Talents of China
- National Natural Science Foundation of China [51222805]
- Program for New Century Excellent Talents in University from the Ministry of Education of China [NCET-11-0129]
- Interdisciplinary Research Project of Hunan University
- China Scholarship Council (CSC) [2010843195]
- Fundamental Research Funds for the Central Universities, Hunan University
- Foundation for the Author of Excellent Doctoral Dissertation of Hunan Province
In this study, a magnetic iron nanoparticles doped ordered mesoporous carbon (Fe/CMK-3) was successfully prepared for highly effective removal of Cr(VI). The resultant carbon material maintained ordered mesostructure, high surface area of 679.4 m(2) g(-1) with 4.42 wt% magnetic nanoparticles (Fe-0, Fe3O4 and lambda-Fe2O3) inside, and excellent magnetic property. Batch experiments were conducted to investigate the removal performance. Fe/CMK-3 exhibited higher Cr(VI) removal efficiency (similar to 97%), broader pH scope of application and easier separation compared with pristine ordered mesoporous carbon (CMK-3). The kinetics data were well described by pseudo-second-order kinetic model, and Langmuir model fitted the sorption isotherms commendably. Moreover, the Cr loaded Fe/CMK-3 could be regenerated by 0.01 mol L-1 NaOH solution, and the removal capacity decreased by similar to 22% in the seventh cycle. X-ray photoelectron spectroscopy (XPS) analysis demonstrated that the Cr(VI) removal was a adsorption and synergistic reduction process owing to trivalent chromium Cr(III) occurring on the surface of Fe/CMK-3. The results suggested that Fe/CMK-3 had potential superiority in removal of Cr(VI) from wastewater. (C) 2013 Elsevier B.V. All rights reserved.
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