Magnetic Fe3O4-polyethyleneimine nanocomposites for efficient harvesting of Chlorella zofingiensis, Chlorella vulgaris, Chlorella sorokiniana, Chlorella ellipsoidea and Botryococcus braunii
| Autor: | Marián Palcut, Zuzana Garaiova, Mária Dománková, Lenka Blinová, Alica Bartošová, Katarína Bártová, Kristína Gerulová |
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| Rok vydání: | 2018 |
| Předmět: |
Chlorella sorokiniana
biology Coprecipitation Chemistry Chlorella vulgaris Nanoparticle 02 engineering and technology 010501 environmental sciences 021001 nanoscience & nanotechnology biology.organism_classification 01 natural sciences Adsorption Chemical engineering Biofuel Zeta potential Botryococcus braunii 0210 nano-technology Agronomy and Crop Science 0105 earth and related environmental sciences |
| Zdroj: | Algal Research. 33:165-172 |
| ISSN: | 2211-9264 |
| DOI: | 10.1016/j.algal.2018.05.003 |
| Popis: | A reduction in energy consumption at every stage of the down streaming process is needed to make 3rd generation of biofuels economically viable. In this study, magnetite (Fe3O4) nanoparticles were synthetized by coprecipitation of FeCl2 and FeCl3 in alkaline medium at two different temperatures. The particle sizes were 11.5 ± 4 and 9.5 ± 4 nm for the nanoparticles prepared at 80 °C and 25 °C, respectively. The adsorption of polyethyleneimine (PEI) onto Fe3O4 was studied by equilibrium batch measurements. A mono-layer absorption of PEI was found. The Fe3O4–PEI nanocomposites had a positive zeta potential, which decreased with increasing pH of the solution. The nanocomposites were used for magnetic harvesting of negatively charged Chlorella zofingiensis, Chlorella vulgaris, Chlorella sorokiniana, Chlorella ellipsoidea and Botryococcus braunii microalgae strains. Upon dosage of 200 mg/L of Fe3O4–PEI harvesting efficiencies of 68–97% were achieved at pH 4 within 1 min. The harvesting efficiency decreased with increasing pH of the suspension. The results demonstrate that Fe3O4 nanoparticles synthesized at the lower temperature (25 °C) could be used for an efficient magnetic harvesting of different microalgae strains. The lower synthesis temperature may thereby contribute to the cost reduction of microalgae harvesting. |
| Databáze: | OpenAIRE |
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