Improvement of microalgae harvesting by magnetic nanocomposites coated with polyethylenimine
Improvement of microalgae harvesting by magnetic nanocomposites coated with polyethylenimine
复制标题
聚乙烯亚胺涂层磁性纳米复合材料改善微藻收获
DOI：
10.1016/j.cej.2013.12.066
复制
发表时间：
2014-04-15
影响因子：
15.1
通讯作者：
Liu, Chun-Zhao
中科院分区：
文献类型：
--
作者：
Hu, Yi-Ru;Guo, Chen;Liu, Chun-Zhao
研究了含高浓度-NH2基团的聚亚胺（PEI）在Fe3O4纳米颗粒上的功能包被，以实现对微藻的高效捕收。制备的功能磁性纳米复合材料直径为12 nm，饱和磁化强度为69.77 emu/g。采用纳米复合材料添加量为20 mg/L，在2 min内收获小球藻椭球细胞，收获效率达97%。提高温度可提高采收效率。吸附等温线数据符合Langmuir模型，表明吸附是单层的。通过静电吸引和纳米级相互作用，Fe3O4-PEI纳米复合材料对微藻细胞的吸附量可达93.46 g-DCW/g-纳米复合材料。该功能纳米复合材料具有执行速度快、能耗低、提高微藻收获过程的水利用率等明显优势，为高效采集微藻提供了基础。(C) 2013 Elsevier B.V.版权所有
Fe3O4 nanoparticles were functionally coated with polyethylenimine (PEI), which contained a high concentration of -NH2 groups, for the efficient harvesting of microalgae. The functional magnetic nanocomposites were 12 nm in diameter and 69.77 emu/g of saturation magnetization. Using a nanocomposite dosage of 20 mg/L for harvesting Chlorella ellipsoidea cells, a harvesting efficiency of 97% was achieved within 2 min. Increasing the temperature resulted in an increase in harvesting efficiency. The adsorption isotherm data fit the Langmuir model, suggesting that the adsorption was monolayer. The adsorption capacity of the Fe3O4-PEI nanocomposites for the microalgal cells reached up to 93.46 g-DCW/g-nanocomposites through electrostatic attraction and nanoscale interactions between the nanocomposites and the microalgal cells. The functional nanocomposites provide a base for efficient microalgae harvesting with clear advantages such as rapid execution, low energy consumption, and improves water-use in the algal harvesting process. (C) 2013 Elsevier B.V. All rights reserved.