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Merck

Highly charged cellulose-based nanocrystals as flocculants for harvesting Chlorella vulgaris.

Bioresource technology (2015-07-27)
Dries Vandamme, Samuel Eyley, Guy Van den Mooter, Koenraad Muylaert, Wim Thielemans
RESUMO

This study presents a novel flocculant for harvesting Chlorella vulgaris as model species for freshwater microalgae based on cellulose nanocrystals (CNCs), thus synthesized from a renewable and biodegradable resource. Cationic pyridinium groups were grafted onto CNCs by two separate one-pot simultaneous esterification and nucleophilic substitution reactions. Both types of modified CNCs were positively charged in the pH range 4-11. Both reactions yielded CNCs with a high degree of substitution (up to 0.38). A maximum flocculation efficiency of 100% was achieved at a dosage of 0.1 g g(-1) biomass. In contrast to conventional polymer flocculants, cationic CNCs were relatively insensitive to inhibition of flocculation by algal organic matter. The present results highlight the potential of these new type of nanocellulose-based flocculants for microalgae harvesting.

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Ácido sulfúrico, 99.999%
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Diclorometano, anhydrous, ≥99.8%, contains 40-150 ppm amylene as stabilizer
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Álcool etílico, puro, 190 proof, ACS spectrophotometric grade, 95.0%
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Álcool etílico, puro, 200 proof, anhydrous, ≥99.5%
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Piridina, ≥99%
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Piridina, anhydrous, 99.8%
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4-(Bromomethyl)benzoic acid, 97%
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p-Toluenesulfonyl chloride, ReagentPlus®, ≥99%
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p-Toluenesulfonyl chloride, reagent grade, ≥98%
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Diclorometano, suitable for HPLC, ≥99.9%, contains 40-150 ppm amylene as stabilizer
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Álcool etílico, puro, 190 proof, ACS reagent, meets USP testing specifications, Excise Tax-free, Permit for use required
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Álcool etílico, puro, 160 proof, Excise Tax-free, Permit for use required