Removal of emulsified oil from water by using recyclable chitosan based covalently bonded composite magnetic flocculant: Performance and mechanism

被引：49
作者：
Ma, Jiangya [1 ]
Fu, Xue [1 ]
Xia, Wei [1 ]
Zhang, Rui [1 ]
Fu, Kun [2 ]
Wu, Genyu [1 ]
Jia, Bangtao [1 ]
Li, Sha [1 ]
Li, Jincheng [1 ]
机构：
[1] Anhui Univ Technol, Engn Res Ctr Biofilm Water Purificat & Utilizat T, Minist Educ, Maanshan 243002, Anhui, Peoples R China
[2] Tongji Univ, Coll Environm Sci & Engn, Shanghai 200092, Peoples R China
来源：
JOURNAL OF HAZARDOUS MATERIALS | 2021年 / 419卷
基金：
中国国家自然科学基金;
关键词：
Flocculation; Emulsified oil; Water treatment; Magnetic separation; Covalent bond; HYBRID COAGULANTS CBHYC; WASTE-WATER; CATIONIC POLYACRYLAMIDE; EFFICIENT TREATMENT; NANOPARTICLES; SEPARATION; PYROLYSIS; MICRO; ACID;
D O I：
10.1016/j.jhazmat.2021.126529
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
In this work, a novel recyclable covalently bonded magnetic flocculant (FS-MC) was successfully prepared by combining chitosan-based modified polymers (MCS) with Fe3O4@SiO2 through a silane coupling agent. The covalent bond Fe-O-Si-O-C and the core-shell structure of FS-MC were confirmed through several characterization methods. The emulsified oily wastewater flocculation performance and mechanism by using FS-MC were evaluated and studied. Results showed that 94.47%, 93.95%, and 92.98% of emulsified oil could be removed by using FS-MC1, FS-MC2 and FS-MC3 at dosages of 2.0, 2.5, and 2.0 mg/L, respectively. Furthermore, FS-MC exhibited an excellent behavior on the removal of organic compounds with molecular weight > 10 kDa, including long chain alkanes, cycloalkanes, and aromatic hydrocarbon compounds. In addition, triple-phase separation of oil, water and flocculants was achieved by using magnetic FS-MC. Due to the introduction of cationic and hydrophobic groups in FS-MC, charge neutralization, compression double electric-layer action, hydrophobic interaction, interfacial adsorption bridging and sweep-flocculation synergistically contributed and enhanced the removal of emulsified oil. Recycling experiments also showed that no obvious decrease of oil removal rate was observed by using magnetic FS-MC flocculants in five cycles.
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页数：12
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