Magnetophoretic separation of Chlorella sp.: Role of cationic polymer binder |
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| Institution: | 1. School of Chemical Engineering, Universiti Sains Malaysia, Nibong Tebal, Penang 14300, Malaysia;2. School of Biological Sciences, Universiti Sains Malaysia, Minden, Penang 11800, Malaysia;3. Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA;1. Nuclear Engineering Department, Technical University of Madrid, José Gutiérrez Abascal 2, 28006 Madrid, Spain;2. Modeling and Simulation Department, Nuclear Safety Council (MOSI CSN), Justo Dorado 11, 28040 Madrid, Spain;1. School of Chemical Engineering and Analytical Science, The Mill, Sackville Street, The University of Manchester, Manchester M13 9PL, UK;2. School of Mechanical, Aerospace and Civil Engineering, Sackville Street Building, Sackville Street, The University of Manchester, M13 9PL, UK;3. Rolls-Royce Plc., PO Box 2000, Raynesway, Derby DE23 7XX, UK;1. Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, PR China;2. Dalian Environmental Monitoring Centre, Dalian 116023, PR China;1. National Key Laboratory of Biochemical Engineering & Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China;2. Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, PR China;3. University of Chinese Academy of Sciences, Beijing 100049, PR China |
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| Abstract: | Cationic polyelectrolyte promoted effective attachment of iron oxide nanoparticles (IONPs) onto microalgal cells through electrostatic attraction. Poly(diallyldimethylammonium chloride) (PDDA) and chitosan (ChiL), both are cationic polymer, are feasible to act as binding agent to promote rapid magnetophoretic separation of Chlorella sp. through low gradient magnetic separation (LGMS) with field gradient ▿B less than 80 T/m in real time. Cell separation efficiency up to 98% for the case of PDDA and 99% for the case of ChiL can be achieved in 6 min when 3 × 107 cells/mL Chlorella sp. are exposed to 300 mg/L surface functionalized-IONPs (SF-IONPs). Different polyelectrolytes do not give significant effect on cell separation efficiency as long as the particle attachment occurred. However, the PDDA is more preferable as the binder for all type of microalgae medium than the chitosan (ChiL) since it is not pH dependent. SF-IONPs coated with PDDA guarantee the cell separation performance for all pH range of cell medium, with 98.21 ± 0.40% at pH 8.84. On the other hand, the ChiL performance will be affected by the cell medium pH, with only 22.93 ± 31.03% biomass recovery at pH 9.25. |
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| Keywords: | Microalgae Renewable fuel source Magnetophoretic separation Polymer binder Electrostatic interaction Sustainable |
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