表面氨基化的Fe_3O_4/SiO_2复合磁性纳米粒子提取白酒中羧酸的研究

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

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。

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-modified Fe3O4/SiO2 nanoparticles based on the reaction between carboxyl groups and amino group at normal temperature.These results demonstrated that magnetic amino-modified Fe3O4/SiO2 nanoparticles could extract carboxylic acid from wine with high efficiency.