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Issue 3, 2013
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Efficient microalgae harvesting by organo-building blocks of nanoclays

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The synthesis of aminoclays with Mg2+ or Fe3+, placed in metal centers by sol–gel reaction with 3-aminopropyltriethoxysilane (APTES) as a precursor, is demonstrated, producing –(CH2)3NH2 organo-functional pendants which are covalent-bonding onto cationic metals. The protonated amine groups in aqueous solution lead the efficient sedimentation (harvesting) of microalgae biomass within approximately 5 min and 120 min for fresh and marine species, respectively. To our surprise, the aminoclays did not depend on microalgae species or media for microalgae harvesting. In particular, the harvesting efficiency (%) of microalgae was not decreased in a wide pH region. The harvesting mechanism can be explained by the sweep flocculation of microalgae, which is confirmed by measurement of zeta potential of aminoclay in aqueous solution where aminoclay shows a positively charged surface in a wide pH region. In order to reduce the cost of aminoclays and to make the harvesting procedures simple, the membrane process using aminoclay-coated cotton filter is introduced for the treatment of 1 L-scale microalgae stocks. It is successfully performed with three recycles using the same aminoclay-coated cotton filter after removing the harvested microalgae biomass. Conclusively, the aminoclay-based microalgae harvesting systems are a promising means of reducing the cost of downstream processes in microalgae-based biorefinery.

Graphical abstract: Efficient microalgae harvesting by organo-building blocks of nanoclays

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The article was received on 08 Nov 2012, accepted on 16 Jan 2013 and first published on 16 Jan 2013

Article type: Paper
DOI: 10.1039/C3GC36767C
Citation: Green Chem., 2013,15, 749-755
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    Efficient microalgae harvesting by organo-building blocks of nanoclays

    W. Farooq, Y. Lee, J. Han, C. H. Darpito, M. Choi and J. Yang, Green Chem., 2013, 15, 749
    DOI: 10.1039/C3GC36767C

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