对落叶松植物多酚进行胺甲基化改性,将其包覆于磁性 Fe3 O4颗粒表面,制备了功能化 Fe3 O4@胺甲基改性植物多酚(Fe3 O4@A-PP),用于能源微藻-普通小球藻的收集。采用 FTIR、磁滞回线、zeta 电位的方法对Fe3 O4@A-PP磁性材料的物理化学性质进行了测定,并研究了投加方式、包覆比例对Fe3 O4@A-PP收集微藻效能的影响。FTIR显示 Fe3 O4@A-PP具有来自 A-PP 的 C—H、N—H 和—OH 等官能团。A-PP 包覆对 Fe3 O4的磁性无改变。与 A-PP的zeta电位相比,Fe3 O4@A-PP的zeta电位增大了5~10 mV。Fe3 O4@A-PP 中两者配比影响微藻的收集效率,当配比为20/200时,收集率达到最大值84.2%。采用 Fe3 O4@A-PP可以将磁絮凝收集时间从 A-PP的30 min缩短至0.5 min 以内。显微图像显示,与 A-PP 絮凝后絮体呈片状松散团聚的状态相比, Fe3 O4@A-PP收集的微藻细胞呈链状被 Fe3 O4包裹或团簇在其四周。吸附电中和在 Fe3 O4@A-PP 磁絮凝收集微藻的机理中发挥重要作用。
The plant polyphenol was modified by amine methylation,and then coated onto Fe3 O4 surface to obtain the functional Fe3 O4@amine-methylated plant polyphenol (Fe3 O4@A-PP)for harvesting the oleagious microalgae-Chlorellavulgaris.FTIR,magnetic hysteresis loop,and zeta potential of Fe3 O4@A-PP were detected to investi-gate its physicochemical properties.The effects of dosing mode of Fe3 O4@A-PP and the ratio of Fe3 O4 to A-PP on harvesting efficiency were also studied.FTIR indicates that Fe3 O4@A-PP has the functional groups of C—H,N—H,and —OH from A-PP.The coating of A-PP onto the Fe3 O4 surface don't interfere the magnetic property of Fe3 O4 .Compared with A-PP,the zeta potential of Fe3 O4@A-PP is improved by 5 10 mV.The ratio of Fe3 O4 (g/L)to A-PP (mg/L)in Fe3 O4@A-PP influences the harvesting efficiency obviously and the highest efficiency of 84.2% is achieved at 20/200.Fe3 O4@A-PP can shorten the harvesting time from 30 min of A-PP to less than 0.5 min.The microscope images show that the microalgae cells are wrapped by Fe3 O4@A-PP and form the cluster matrix or adhere around the Fe3 O4 ,unlike the flaky and loose flocs or aggregates after A-PP flocculation.The mechanism of charge neutralization in the Fe3 O4@A-PP magnetic flocculation plays an important role in microalgal harvesting.
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