期刊
BIORESOURCE TECHNOLOGY
卷 102, 期 21, 页码 10047-10051出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2011.08.021
关键词
Microalgae harvesting; Fe(3)O(4) nanoparticles; Botryococcus braun ii; Chlorella ellipsoidea; Electrostatic attraction
资金
- National Basic Research Program (973 Program) of China [2011CB200905, 2011CB200903]
- National Natural Science Foundation of China [20876158]
- Beijing Natural Science Foundation [2102041]
- Chinese Academy of Sciences [YZ200947, KSCX2-YW-R-2]
A simple and rapid harvesting method by in situ magnetic separation with naked Fe(3)O(4) nanoparticles has been developed for the microalgal recovery of Botryococcus braunii and Chlorella ellipsoidea. After adding the magnetic particles to the microalgal culture broth, the microalgal cells were adsorbed and then separated by an external magnetic field. The maximal recovery efficiency reached more than 98% for both microalgae at a stirring speed of 120 r/min within 1 min, and the maximal adsorption capacity of these Fe(3)O(4) nanoparticles reached 55.9 mg-dry biomass/mg-particles for B. braunii and 5.83 mg-dry biomass/mg-particles for C. ellipsoidea. Appropriate pH value and high nanoparticle dose were favorable to the microalgae recovery, and the adsorption mechanism between the naked Fe(3)O(4) nanoparticles and the microalgal cells was mainly due to the electrostatic attraction. The developed in situ magnetic separation technology provides a great potential for saving time and energy associated with improving microalgal harvesting. (C) 2011 Elsevier Ltd. All rights reserved.
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