Plant polyphenol (PP), a natural polymer from the Larix gmelinii, was selected as the surfactant to synthesize Fe3O4. The Fe3O4@PP composite was prepared by in situ solvothermal method, and characterized using FE-SEM, TEM, DLS, XRD, FTIR, XPS, TGA, and VSM. The harvesting efficiency of magnetic particles to Chlorella vulgaris was investigated under different parameters, including dosage, algal density, pH and reuse. The results showed that the core-shell sphere of Fe3O4@PP was coated by PP layer. The addition of PP improved the dispersion of Fe3O4 and reduced the particle size from 230 nm to 180 nm. Fe3O4@PP had a higher saturated magnetization and thermal stability than Fe3O4. Fe3O4@PP achieved 98% harvesting efficiency at the dosage of 2.0 g/L, algal density of 2.0 × 1010 cell/L, and pH 8.0. The Fe3O4@PP was more efficiently detached from the harvested cell aggregates than Fe3O4 by alkali solution with ultrasonic, and realized 95% quality recovery. Recycled Fe3O4@PP maintained more than 80% of harvesting efficiency after five recycles.

In situ synthesis of magnetic Fe3O4 @ plant polyphenol composite particles for Chlorella vulgaris harvesting

ACS Fall 2020 Virtual Meeting

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