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Magnesium Aminoclay-Fe 3 O 4 (MgAC-Fe 3 O 4 ) Hybrid Composites for Harvesting of Mixed Microalgae

Author

Listed:
  • Bohwa Kim

    (Advanced Biomass R&D Center, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea
    Equally Contributing Authors.)

  • Vu Khac Hoang Bui

    (Department of BioNano Technology, Gachon University, 1342 Seongnamdaero, Sujeong-gu, Seongnam-si, Gyeonggi-do 13120, Korea
    Equally Contributing Authors.)

  • Wasif Farooq

    (Department of Chemical Engineering, King Fahd University of Petroleum and Minerals (KFUPM), Dhahran 31261, Saudi Arabia)

  • Sang Goo Jeon

    (Biomass and Waste Energy Laboratory, Korea Institute of Energy Research (KIER), Daejeon 34129, Korea)

  • You-Kwan Oh

    (School of Chemical and Biomolecular Engineering, Pusan National University, Busan 46241, Korea)

  • Young-Chul Lee

    (Department of BioNano Technology, Gachon University, 1342 Seongnamdaero, Sujeong-gu, Seongnam-si, Gyeonggi-do 13120, Korea)

Abstract

In this paper, we describe the synthesis of magnesium aminoclay-iron oxide (MgAC-Fe 3 O 4 ) hybrid composites for microalgae-harvesting application. MgAC-templated Fe 3 O 4 nanoparticles (NPs) were synthesized in different ratios of MgAC and Fe 3 O 4 NPs. The uniform distribution of Fe 3 O 4 NPs in the MgAC matrix was confirmed by transmission electron microscopy (TEM). According to obtained X-ray diffraction (XRD) patterns, increased MgAC loading leads to decreased intensity of the composites’ (311) plane of Fe 3 O 4 NPs. For harvesting of Chlorella sp. KR-1, Scenedesmus obliquus and mixed microalgae ( Chlorella sp. KR-1/ Scenedesmus obliquus ), the optimal pH was 4.0. At higher pHs, the microalgae-harvesting efficiencies fell. Sample #1, which had the highest MgAC concentration, showed the most stability: the harvesting efficiencies for Chlorella sp. KR-1, Scenedesmus obliquus , and mixed microalgae were reduced only to ~50% at pH = 10.0. The electrostatic interaction between MgAC and the Fe 3 O 4 NPs in the hybrid samples by microalgae, as confirmed by zeta potential measurements, were attributed to the harvesting mechanisms. Moreover, the zeta potentials of the MgAC-Fe 3 O 4 hybrid composites were reduced as pH was increased, thus diminishing the microalgae-harvesting efficiencies.

Suggested Citation

  • Bohwa Kim & Vu Khac Hoang Bui & Wasif Farooq & Sang Goo Jeon & You-Kwan Oh & Young-Chul Lee, 2018. "Magnesium Aminoclay-Fe 3 O 4 (MgAC-Fe 3 O 4 ) Hybrid Composites for Harvesting of Mixed Microalgae," Energies, MDPI, vol. 11(6), pages 1-10, May.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:6:p:1359-:d:149144
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    References listed on IDEAS

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    1. Huang, GuanHua & Chen, Feng & Wei, Dong & Zhang, XueWu & Chen, Gu, 2010. "Biodiesel production by microalgal biotechnology," Applied Energy, Elsevier, vol. 87(1), pages 38-46, January.
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    1. Vasistha, S. & Khanra, A. & Clifford, M. & Rai, M.P., 2021. "Current advances in microalgae harvesting and lipid extraction processes for improved biodiesel production: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 137(C).

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