期刊
CHEMICAL ENGINEERING JOURNAL
卷 262, 期 -, 页码 517-526出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2014.10.002
关键词
CaFe2O4 MNPs; Selective adsorption; Multi-dyes systems; Regeneration; Recovery
资金
- National Nature Science Foundation of China [NSFC51178212]
- Liaoning Provincial Department of Education Innovation Team Projects [LT2012001]
- Shenyang Science and Technology Plan Project, China [F12-277-1-69, F13-289-1-00]
- Foundation of 211 Project for Innovative Talent Training
- Liaoning University
- Foundation for Young Scholars of Liaoning University [2012LDQN06]
A novel adsorbent of CaFe2O4 magnetic nanoparticles (MNPs) which was synthesized by sol-gel process, showed an excellent high affinity to anionic congo red (CR), and could be employed to selectively adsorb CR from ternary dye system with a high separation factor. The mechanism of the selectivity was revealed in detail. The effects of various parameters such as pHs, ionic strengths and coexisting ions on the selective adsorption were investigated. The CR adsorption followed pseudo-second-order kinetic model. The sorption data could be well interpreted by the Langmuir model. The thermodynamic parameters showed the spontaneous, exothermic and physical nature of the adsorption process. The selectively adsorbed CR dye could be recovered rapidly by ethanol/Na3PO4 (2 mM) (1/1, v/v) with the recovery percentage of 96.6%. The regenerated adsorbent still showed a highly selective adsorption capacity for CR after five regeneration-removal cycles and a strong anti-interference ability, confirming the potential of the CaFe2-O4 MNPs as practical selective adsorbent for treatments of dye containing effluents. (C) 2014 Elsevier B.V. All rights reserved.
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