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  • Title: CO₂ controlled flocculation of microalgae using pH responsive cellulose nanocrystals.
    Author: Eyley S, Vandamme D, Lama S, Van den Mooter G, Muylaert K, Thielemans W.
    Journal: Nanoscale; 2015 Sep 14; 7(34):14413-21. PubMed ID: 26248574.
    Abstract:
    Cellulose nanocrystals were grafted with imidazole functionalities up to DS 0.06 using a one-pot functionalization strategy. The resulting nanocrystals were shown to have a pH responsive surface charge which was found to be positive below pH 6 and negative above pH 7. These imidazolyl cellulose nanocrystals were tested for flocculation of Chlorella vulgaris using CO2 to induce flocculation. Up to 90% flocculation efficiency was achieved with 200 mg L(-1) dose. Furthermore, the modified cellulose nanocrystals showed good compatibility with the microalgae during cultivation, giving potential for the production of reversible flocculation systems.
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