title: Effect of barium ferrite particle size on detachment efficiency in magnetophoretic harvesting of oleaginous Chlorella sp.
abstract: Microalgal biofuel is garnering many positive and promising reviews as a fuel for the next generation while research effort continues to improve the efficiency of its harvesting for commercial success. In this report, magnetophoretic harvesting of microalgae is conducted through a three-step process, which includes functionalization of magnetic particles by (3-aminopropyl)triethoxysilane (APTES), magnetic separation, and detachment of magnetic particles by increasing pH to higher than the isoelectric point. Detachment process is specifically focused and found that the use of larger magnetic particles is more efficient for detachment of magnetic particles from algae-particle conglomerates. The detaching efficiency improves from 12.5% to 85% when the particle size is increased from 108 nm to 1.17 μm. Smaller magnetic particles provide larger contact area to microalgae and form strong electrostatic binding to negatively-charged microalgae when pH is lower than the isoelectric point.
authors: Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea.
authors: Jung Yoon
authors: JY
authors: Seo
authors: Clean Fuel Department, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 305-343, Republic of Korea.
authors: Kyubock
authors: K
authors: Lee
authors: Clean Fuel Department, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 305-343, Republic of Korea.
authors: So Yeun
authors: SY
authors: Lee
authors: Clean Fuel Department, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 305-343, Republic of Korea.
authors: Sang Goo
authors: SG
authors: Jeon
authors: Clean Fuel Department, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 305-343, Republic of Korea.
authors: Jeong-Geol
authors: JG
authors: Na
authors: Clean Fuel Department, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 305-343, Republic of Korea. Electronic address: ykoh@kier.re.kr.
authors: You-Kwan
authors: YK
authors: Oh
authors: Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea. Electronic address: SeungBinPark@kaist.ac.kr.
authors: Seung Bin
authors: SB
authors: Park
mesh_terms: D017609:Barium Compounds / Q000737:chemistry* / Q000494:pharmacology*; D002708:Chlorella / Q000187:drug effects* / Q000254:growth & development* / Q000378:metabolism; D005290:Ferric Compounds / Q000737:chemistry* / Q000494:pharmacology*; D008055:Lipids / Q000737:chemistry*; D008280:Magnetics / Q000379:methods*; D010316:Particle Size; D011437:Propylamines; D012821:Silanes / Q000494:pharmacology; D012996:Solutions; D055672:Static Electricity
chemical_list: D017609:Barium Compounds; D005290:Ferric Compounds; D008055:Lipids; D011437:Propylamines; D012821:Silanes; D012996:Solutions; C016258:barium ferrite; C477625:amino-propyl-triethoxysilane
keywords: Coulombic interaction; Detaching; Magnetic particles; Microalgae separation