Abstract
Fe3O4 nanoparticles were functionally coated with polyethylenimine (PEI), which contained a high concentration of NH2 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 of 97% was achieved within 2min. Increasing the temperature resulted in an increase in harvesting efficiency. The adsorption isotherm data fit the Langmuir model, suggesting that the adsorption was monolayer. The adsorption capacity of the Fe3O4–PEI nanocomposites for the microalgal cells reached up to 93.46g-DCW/g-nanocomposites through electrostatic attraction and nanoscale interactions between the nanocomposites and the microalgal cells. The functional nanocomposites provide a base for efficient microalgae harvesting with clear advantages such as rapid execution, low energy consumption, and improves water-use in the algal harvesting process.
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