叶酸修饰磁性氧化石墨烯载体的制备、表征及其磁性研究
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篇名: 叶酸修饰磁性氧化石墨烯载体的制备、表征及其磁性研究
TITLE:
摘要: 目的:制备叶酸(FA)修饰磁性氧化石墨烯载体(FA-GO-Fe3O4),并对其进行表征和磁性研究。方法:以氧化石墨烯(GO)、六水合三氯化铁、四水合氯化亚铁为原料,采用水热共沉淀法制备磁性氧化石墨烯(GO-Fe3O4),再通过酰胺键与FA连接,得到FA-GO-Fe3O4,采用扫描电镜、红外光谱仪、X射线衍射(XRD)仪和粒度及Zeta电位分析仪分别对GO、GO-Fe3O4和FA-GO-Fe3O4进行表征,并测定其Zeta电位,通过外加磁场作用和磁滞回线考察FA-GO-Fe3O4的磁性。结果:与GO、GO-Fe3O4比较,扫描电镜图和XRD图显示,在FA-GO-Fe3O4合成中破坏了GO的结构,且表面有粒子团附着,15 °~30 °之间有非晶相峰;红外光谱显示,FA-GO-Fe3O4在574 cm-1和1 640 cm-1处有吸收峰,分别属于 Fe-O和—CONH—的特征吸收。GO、GO-Fe3O4和FA-GO-Fe3O4的Zeta电位分别为-24、5.62、-22.7 mV,FA-GO-Fe3O4在外加磁场作用下有明显磁性,在室温、外加正反磁场条件下饱和磁化强度约为20~25 emu/g。结论:本研究所制FA-GO-Fe3O4具有超顺磁性,且稳定性强于GO-Fe3O4。
ABSTRACT: OBJECTIVE: To prepare Magnetic graphene oxide modified by folic acid (FA-GO-Fe3O4), and to characterize it and study its magnetism. METHODS: Using graphene oxide (GO), ferric chloride hexahydrate and ferrous chloride tetrahydrate as raw material, magnetic graphene oxide (GO-Fe3O4) was synthesized by hydrothermal coprecipitation method. FA-GO-Fe3O4 was obtained by linking amido bond to folic acid. GO, GO-Fe3O4 and FA-GO-Fe3O4 were characterized by scanning electron microscopy, infrared spectroscopy, X-ray diffraction (XRD) and particle size and Zeta potential analyzer respectively. Zeta potential was measured. The magnetism of FA-GO-Fe3O4 were investigated by the action of external magnetic field and hysteresis loop. RESULTS: Compared with GO and GO-Fe3O4, scanning electron microscopy and XRD showed that the structure of GO destroyed in the synthesis of FA-GO-Fe3O4, and there were particles attached on the surface, and amorphous phase peaks between 15 ° and 30 °. Infrared spectroscopy showed that FA-GO-Fe3O4 had absorption peaks at 574 cm-1 and 1 640 cm-1, which belonged to the characteristic absorption of Fe-O and —CONH— respectively. Zeta potentials of GO, GO-Fe3O4 and FA-GO-Fe3O4 were -24, 5.62 and -22.7 mV, respectively. FA-GO-Fe3O4 had obvious magnetism under external magnetic field, and its saturation magnetization was about 20-25 emu/g under room temperature and applied positive and negative magnetic fields. CONCLUSIONS: FA-GO-Fe3O4 prepared in this study has superparamagnetism and is more stable than GO-Fe3O4.
期刊: 2019年第30卷第15期
作者: 赵鹏慧,王彦,刘雪颖,王永利,刘家园,王立华
AUTHORS: ZHAO Penghui,WANG Yan,LIU Xueying,WANG Yongli,LIU Jiayuan,WANG Lihua
关键字: 氧化石墨烯;叶酸;制备;表征;磁性
KEYWORDS: Graphene oxide; Folic acid; Preparation; Characterization; Magnetism
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