表面氨基化的Fe3O4/SiO2复合磁性纳米粒子提取白酒中羧酸的研究

利用化学共沉淀法制备磁性四氧化三铁纳米粒子，并用SiO2 和3- 氨丙基三乙氧基硅烷(APTES)依次对磁性纳米颗粒进行表面修饰，成功获得表面氨基改性后的磁性Fe3O4/SiO2 复合纳米粒子；采用红外光谱(IR)、透射电子显微镜(TEM)对氨基改性前后的Fe3O4/SiO2 复合纳米粒子的形态、结构进行表征。并利用- NH2 在常温下易与羧基反应的原理，用氨基改性后的磁性Fe3O4/SiO2 复合纳米粒子提取白酒中的羧酸类物质，用气相色谱- 质谱(GC-MS)联用对提取情况进行研究。结果表明：氨基改性后的磁性Fe3O4/SiO2 复合纳米粒子与白酒中的羧基能够发生较好的键合反应，从而实现提取白酒中羧酸的效果。

Extraction of Carboxylic Acid from Wine Using Fe_3O_4 /SiO_2 Nanoparticles Modified with Amino Groups

In this study,magnetic Fe3O4 nanoparticles were synthesized by chemical co-precipitation method,and aminomodified magnetic Fe3O4/SiO2 nanoparticles were obtained through adding SiO2 and APTES into Fe3O4 nanoparticles;the morphology and structure of pre-and post-modified Fe3O4/SiO2 nanoparticles by amino groups were characterized by infrared absorption spectrum(IR) and transmission electron microscopy(TEM).Gas chromatography-mass spectrum(GC-MS) was used to extract carboxylic acid from wine by magnetic amino...