摘要
对落叶松植物多酚进行胺甲基化改性,将其包覆于磁性Fe_3O_4颗粒表面,制备了功能化Fe_3O_4@胺甲基改性植物多酚(Fe_3O_4@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Fe_3O_4@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Fe_3O_4@A-PP收集微藻效能的影响。FTIR显示Fe_3O_4@A-PP具有来自A-PP的C—H、N—H和—OH等官能团。A-PP包覆对Fe_3O_4的磁性无改变。与A-PP的zeta电位相比,Fe_3O_4@A-PP的zeta电位增大了5~10mV。Fe_3O_4@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Fe_3O_4@A-PP可以将磁絮凝收集时间从A-PP的30min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,Fe_3O_4@A-PP收集的微藻细胞呈链状被Fe_3O_4包裹或团簇在其四周。吸附电中和在Fe_3O_4@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 Fe_3O_4 surface to obtain the functional Fe_3O_4@amine-methylated plant polyphenol（Fe_3O_4@A-PP）for harvesting the oleagious microalgaeChlorella vulgaris.FTIR,magnetic hysteresis loop,and zeta potential of Fe_3O_4@A-PP were detected to investigate its physicochemical properties.The effects of dosing mode of Fe_3O_4@A-PP and the ratio of Fe_3O_4 to A-PP on harvesting efficiency were also studied.FTIR indicates that Fe_3O_4@A-PP has the functional groups of C—H,N—H,and —OH from A-PP.The coating of A-PP onto the Fe_3O_4 surface don＇t interfere the magnetic property of Fe_3O_4.Compared with A-PP,the zeta potential of Fe_3O_4 @A-PP is improved by 5-10 mV.The ratio of Fe_3O_4（g/L）to A-PP（mg/L）in Fe_3O_4@A-PP influences the harvesting efficiency obviously and the highest efficiency of84.2%is achieved at 20/200.Fe_3O_4 @A-PP can shorten the harvesting time from 30 min of A-PP to less than0.5min.The microscope images show that the microalgae cells are wrapped by Fe_3O_4@A-PP and form the cluster matrix or adhere around the Fe_3O_4,unlike the flaky and loose flocs or aggregates after A-PP flocculation.The mechanism of charge neutralization in the Fe_3O_4@A-PP magnetic flocculation plays an important role in microalgal harvesting.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2017年第1期121-128,共8页
Acta Materiae Compositae Sinica
基金
北京林业大学科学研究项目(2015PY-08)
中央高校基本科研业务费专项资金资助项目(2015ZCQ-HJ-02)
水体污染控制与治理技术重大专项(2013ZX07209001-003)
关键词
植物多酚
FE3O4
胺甲基化改性
微藻
收集
絮凝
plant polyphenol
magnetite
amine-methylation
algae
seperation
flocculation
