Abstract
Separating microalgal cells from the aquatic environment is a crucial step for minimizing their adverse impacts or utilizing microalgal biomass. In this study, low-cost facile goethite/magnetite nanoparticles (GMNs) were prepared by the co-precipitation method in one step and employed for comparative harvesting of Microcystis aeruginosa (Cyanobacteria) and Stigeoclonium sp. (Chlorophyta). The highest harvesting efficiency for M. aeruginosa and Stigeoclonium sp. reached 99.0% (0.83 g GMNs g−1 dry biomass) and 98.2% (0.46 g GMNs g−1 dry biomass), respectively. To lower the microalgae harvesting cost, GMNs were recycled 5 times by coupling ultrasonic hexane extraction and alkali washing. Notably, the harvesting performance of GMNs was boosted by the ultrasonic reactivation, and goethite in GMNs matrix was found to be a pivotal contributor to the enhancement. Moreover, extended Derjaguin-Landau-Verwey-Overbeek (EDLVO) theory was applied to providing deep insight into GMNs-microalgae interfacial interactions and different harvesting capabilities of GMNs toward M. aeruginosa and Stigeoclonium sp.
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Funding
This work was supported by the National Key R&D Program of China (2017YFC1601802), the Science and Technology Supporting Program of Guizhou ([2021]464), and the State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control (2010DS700124-KF1708).
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Fu, Y., Hu, F. & Xu, Y. Cyanobacteria and Chlorophyta in situ magnetic harvesting by goethite/magnetite nanoparticles. J Appl Phycol 34, 857–869 (2022). https://doi.org/10.1007/s10811-021-02621-x
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DOI: https://doi.org/10.1007/s10811-021-02621-x