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

Bohwa Kim, Vu Khac Hoang Bui, Wasif Farooq, Sang Goo Jeon, You-Kwan Oh and Young-Chul Lee
Additional contact information
Bohwa Kim: Advanced Biomass R&D Center, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea
Vu Khac Hoang Bui: Department of BioNano Technology, Gachon University, 1342 Seongnamdaero, Sujeong-gu, Seongnam-si, Gyeonggi-do 13120, Korea
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

Energies, 2018, vol. 11, issue 6, 1-10

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.

Keywords: magnesium aminoclay (MgAC); magnetite; Chlorella sp. KR-1; Scenedesmus obliquus; microalgae harvesting; biorefinement (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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