Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 696, Issue -, Pages 1205-1212Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.12.118
Keywords
Composite materials; Magnetization; Chemical synthesis; Polymers; Surfaces and interfaces
Categories
Funding
- National Natural Science Foundation of China [21506045, 41271249]
- project of Natural Science Foundation of Zhejiang Province [LQ14B070006]
- Innovative R&D Research Fund of Hangzhou Dianzi University [ZX140206318006]
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In this study, a class of chitosan (CS)-grafted magnetic nanoparticles (MNPs) was synthesized for treating emulsified oil wastewaters. Fe3O4 MNPs were synthesized by using a solvothermal method, followed by coating with aminopropyl-functionalized silica (APFS) to form a surface for further grafting of CS molecular chains. The synthesized MNPs were characterized by various technologies and their demulsification performances were evaluated under various conditions. Results showed that synthetic Fe3O4 MNPs showed negligible demulsification effect, however, under both acidic and neutral conditions, APFS-coated MNPs (Fe3O4@APFS MNPs) exhibited good demulsification effect via electrostatic attraction. It was also found that demulsification performance could be further enhanced upon CS grafting, especially under alkaline condition. Results showed that, under both acidic and neutral conditions, CS-grafted MNPs (Fe3O4@APFS-G-CS MNPs) could efficiently flocculate oil droplets mainly via electrostatic attraction, thereby facilitating magnetic separation; while under alkaline condition, MNPs could overcome electrostatic repulsion and be absorbed onto oil droplet surface via hydrophobic interaction, thereby exhibiting certain demulsification effect under magnetic field. Moreover, under both acidic and neutral conditions, synthesized MNPs could be recycled up to 7 cycles without showing significant loss in demulsification efficiency. In conclusion, CS-grafted MNPs can be easily synthesized and recycled, providing a potential promising approach for efficient treatment of emulsified oil wastewater. (C) 2016 Elsevier B.V. All rights reserved.
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