Journal
ENVIRONMENTAL TECHNOLOGY
Volume 41, Issue 20, Pages 2618-2624Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2019.1575918
Keywords
Magnetic separation; algae; magnetic nanoparticles; detachment; thermodynamics
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Funding
- National Natural Science Foundation of China [41472312]
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Magnetic separation, a promising bioseparation technology, is confronted with the challenges in recovery and recycle of magnetic matters during algae harvesting for biofuel extraction. The thermodynamic method was used to characterize the surface interactions between MNPs and algae cells. Three methods were adopted to detach magnetic nanoparticles-algae (Microcystis aeruginosa,Synechocystis sp.,Nannochloropsis maritimaandStigeoclonium sp.) and recover magnetic nanoparticles (MNPs) in this study. The thermodynamic method indicated that the greatest adhesion strength was expected forStigeoclonium sp.on MNPs. High detachment efficiency of MNP-algae was achieved by ultrasonic-extracting, which got above 90% after 5 recycles. Moreover, the harvesting efficiencies of these four algae cells could remain more than 90% after 5 recycles using a mixture of the regenerated and the raw MNPs.
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