The effect of magnetic nanoparticles on Microcystis aeruginosa removal by a composite coagulant

被引：66
作者：
Jiang, Chen [1 ]
Wang, Ren [1 ]
Ma, Wei [1 ]
机构：
[1] Dalian Univ Technol, Dept Chem, Res Ctr Seawater Desalinat & Multipurpose Utiliza, Dalian 116023, Peoples R China
来源：
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2010年 / 369卷 / 1-3期
关键词：
Magnetic nanoparticles; Composite coagulant; Microcystis aeruginosa removal; Polyferric chloride; Adsorption; DISSOLVED AIR FLOTATION; POLYFERRIC SULFATE; CONVENTIONAL SEDIMENTATION; CYANOBACTERIAL CELLS; ORGANIC-MATTER; CHLORIDE; FLOCCULATION; MECHANISMS; WATER; PERFORMANCE;
D O I：
10.1016/j.colsurfa.2010.08.033
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A composite coagulant was prepared by magnetic nanoparticles and polyferric chloride (PFC) for Microcystis aeruginosa removal. The magnetic nanoparticles and composite coagulant were characterized in terms of typical properties, structure and morphological analysis (TEM, XRD and FTIR). The coagulation performances of magnetic nanoparticles/PFC (MPFC) and PFC were compared under different pH conditions and coagulant dosages. Natural water spiked with M. aeruginosa cells was also investigated to study the effect of natural organic matter (NOM) on the function of magnetic nanoparticles. The results show that the composite coagulant exhibits improved coagulation efficiency with higher removal values and slighter pH dependence. The better performance could be attributed to the co-effect of PFC and magnetic nanoparticles. The newly added magnetite acts as an adsorber, which favors the M. aeruginosa removal by facilitating the formation of settleable flocs and reducing the negative influence of NOM at optimal dosages. In addition, settling kinetic studies present accelerated settling velocity of MPFC under external magnetic field, emphasising the role plays by magnetic nanoparticles in promoting the coagulation efficiency. (C) 2010 Elsevier B.V. All rights reserved.
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页码：260 / 267
页数：8
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