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Energies 2018, 11(6), 1359; https://doi.org/10.3390/en11061359

Magnesium Aminoclay-Fe3O4 (MgAC-Fe3O4) Hybrid Composites for Harvesting of Mixed Microalgae

1
Advanced Biomass R&D Center, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea
2
Department of BioNano Technology, Gachon University, 1342 Seongnamdaero, Sujeong-gu, Seongnam-si, Gyeonggi-do 13120, Korea
3
Department of Chemical Engineering, King Fahd University of Petroleum and Minerals (KFUPM), Dhahran 31261, Saudi Arabia
4
Biomass and Waste Energy Laboratory, Korea Institute of Energy Research (KIER), Daejeon 34129, Korea
5
School of Chemical and Biomolecular Engineering, Pusan National University, Busan 46241, Korea
Equally Contributing Authors.
*
Authors to whom correspondence should be addressed.
Received: 5 April 2018 / Revised: 25 May 2018 / Accepted: 25 May 2018 / Published: 26 May 2018
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Abstract

In this paper, we describe the synthesis of magnesium aminoclay-iron oxide (MgAC-Fe3O4) hybrid composites for microalgae-harvesting application. MgAC-templated Fe3O4 nanoparticles (NPs) were synthesized in different ratios of MgAC and Fe3O4 NPs. The uniform distribution of Fe3O4 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 Fe3O4 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 Fe3O4 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-Fe3O4 hybrid composites were reduced as pH was increased, thus diminishing the microalgae-harvesting efficiencies. View Full-Text
Keywords: magnesium aminoclay (MgAC); magnetite; Chlorella sp. KR-1; Scenedesmus obliquus; microalgae harvesting; biorefinement magnesium aminoclay (MgAC); magnetite; Chlorella sp. KR-1; Scenedesmus obliquus; microalgae harvesting; biorefinement
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Kim, B.; Bui, V.K.H.; Farooq, W.; Jeon, S.G.; Oh, Y.-K.; Lee, Y.-C. Magnesium Aminoclay-Fe3O4 (MgAC-Fe3O4) Hybrid Composites for Harvesting of Mixed Microalgae. Energies 2018, 11, 1359.

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