School of Environmental and Chemical Engineering, Shanghai University, Shanghai, People's Republic of China.
Guizhou Academy of Testing and Analysis, Guiyang, People's Republic of China.
Environ Technol. 2020 Aug;41(20):2618-2624. doi: 10.1080/09593330.2019.1575918. Epub 2019 Feb 18.
Magnetic separation, a promising bioseparation technology, is confronted with the challenges in recovery and recycle of magnetic matters during algae harvesting for biofuel extraction. The thermodynamic method was used to characterize the surface interactions between MNPs and algae cells. Three methods were adopted to detach magnetic nanoparticles-algae (, , and ) and recover magnetic nanoparticles (MNPs) in this study. The thermodynamic method indicated that the greatest adhesion strength was expected for on MNPs. High detachment efficiency of MNP-algae was achieved by ultrasonic-extracting, which got above 90% after 5 recycles. Moreover, the harvesting efficiencies of these four algae cells could remain more than 90% after 5 recycles using a mixture of the regenerated and the raw MNPs.
磁分离作为一种很有前途的生物技术，在从藻类中提取生物燃料时，面临着回收和循环利用磁性物质的挑战。本研究采用热力学方法来表征 MNPs 与藻类细胞之间的表面相互作用。采用三种方法来分离磁纳米粒子-藻类（、、和）并回收磁性纳米粒子（MNPs）。热力学方法表明，对于 MNPs，预期的最大粘附强度为。通过超声提取可以实现磁纳米粒子-藻类的高脱离效率，经过 5 次循环后，其脱离效率超过 90%。此外，使用再生和原始 MNPs 的混合物，这四种藻类细胞的收获效率在 5 次循环后仍能保持在 90%以上。
