摘要
采用高温溶剂热法制备了Fe_3O_4纳米粒子,通过碱性条件下正硅酸乙酯(TEOS)的水解和缩聚反应实现外层SiO2的包覆,利用丁二酸酐改性核壳结构的Fe_3O_4@SiO_2,制备了一种表面具有羧基的磁性复合吸附剂Fe_3O_4@SiO_2-NH-COOH.通过傅里叶红外光谱(FT-IR)、X-射线衍射仪(XRD)、热重分析(TGA)和X射线光电子能谱仪(XPS)对吸附剂的组成和结构特性进行了研究,结果表明:氨基和羧基成功修饰在Fe_3O_4@SiO_2表面,未改变晶型结构,且材料具有良好的磁特性和磁分离性能.
The Fe3O4 nanoparticles were prepared via a solvothermal method,then coated with SiO2 by the hydrolysis and polycondensation of tetraethoxysilane(TEOS)under alkaline conditions,the carboxyl-functionalized magnetic composite adsorbent(Fe3O4@SiO2-NH-COOH)was developed by modification of core-shell Fe3O4@SiO2 with succinic acid.The composition and structural characteristics were investigated by Fourier transform infrared spectroscopy(FT-IR),powder X-ray diffraction(XRD),thermogravimetric analysis(TGA)and X-ray photoelectron spectroscopy(XPS).The results showed that amino and carboxyl groups successfully modified onto the surface of the Fe3O4@SiO2,the crystal structure is well maintained after modification,and the adsorbent has good magnetic and magnetic separation properties.
作者
王家宏
张丹
WANG Jia-hong;ZHANG Dan(School of Environmental Science and Engineering,Shaanxi University of Science&Technology,Xi′an 710021,China)
出处
《陕西科技大学学报》
CAS
2018年第2期21-25,共5页
Journal of Shaanxi University of Science & Technology
基金
国家自然科学基金项目(21677092)
陕西省教育厅专项科研计划项目(15JK1095)
