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《Acta Materiae Compositae Sinica》 2017-01
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Harvesting oleagious microalgae using magnetic flocculation by Fe_3O_4@amino-methylated plant polyphenol

ZHAO Yuan;WANG Xiaoyu;LIU Lijun;LIANG Wenyan;College of Environmental Science & Engineering,Beijing Forestry University,Beijing Key Lab for Source Control Technology of Water Pollution;  
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.
【Key Words】: plant polyphenol magnetite amine-methylation algae seperation flocculation
【Fund】: 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)
【CateGory Index】: TM27
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