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Fe 3 O 4 nanoparticles were functionally coated with polyethylenimine (PEI), which contained a high concentration of NH 2 groups, for the efficient harvesting of microalgae. The functional magnetic nanocomposites were 12nm in diameter and 69.77emu/g of saturation magnetization. Using a nanocomposite dosage of 20mg/L for harvesting Chlorella ellipsoidea cells, a harvesting efficiency...
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