将胺甲基化改性植物多酚（A?PP）包覆Fe3O4后所制备的Fe3O4＠A?PP，作为功能性磁絮凝剂用于能源微藻细胞的采收，研究了藻液pH值、藻细胞胞外分泌有机物、絮凝搅拌条件和磁场强度对Fe3 O4＠A?PP收集微藻细胞效率的影响．结果显示，与A?PP相比，Fe3 O4＠A?PP的等电点由6．5提高到8．5，收集微藻的最佳pH值由7．1增大至8．2．Fe3O4＠A?PP收集微藻细胞时，不受胞外分泌有机物的影响．快速搅拌的速率在200—500 r·min－1之间时，对Fe3 O4＠A?PP收集微藻的效率影响不大，在快速搅拌之后无需增加慢速搅拌．在磁场强度为0．16 T—0．28 T时，Fe3 O4＠A?PP 收集率随着磁场强度升高而逐渐增大，大于0．28 T后，收集效率不再增加．
A functional magnetic flocculant Fe3O4@A?PP, for harvesting oleagious microalgae was prepared by coating the amine-methylated plant polyphenol ( A?PP ) onto the Fe3 O4 particles. The influencing factors on harvesting efficiency, including pH value of algal broth, algal organic matter, flocculation stirring conditions, and intensity of magnetic field, were investigated. Compared with A?PP, the isoelectric pointof Fe3O4@A?PP increased from 6.5 to 8.5. The optimum pH value of harvesting also improved from 7. 1 to 8. 2. Algal organic matters did not interfere the harvesting processes when Fe3O4@A?PP was applied. When the speed of stirring was in the range of 200—500 r·min-1 , it did not influence the harvesting efficiency. And there was no need to have slow stirring after the rapid stirring. When the intensity of magnetic field was between 0.16—0.28 T, the harvesting efficiency of Fe3 O4@A?PP was increased along with the rise of intensity. But when it exceeded 0.28 T, the harvesting efficiency did not improve further.
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