伯仲胺基团修饰Fe3O4磁性材料的制备和性能表征
Preparation and performance characterization of primary secondary amine-modified Fe3O4 magnetic materials
周书威 1傅红 2杨方3
作者信息
- 1. 福州海关技术中心,福州 350001;福州大学 生物科学与工程学院,福州 350108
- 2. 福州大学 生物科学与工程学院,福州 350108
- 3. 福州海关技术中心,福州 350001
- 折叠
摘要
食品中的有机酸等内源性物质会干扰其中痕量残留物的检测,为消除此影响,以N-β-(氨乙基)-γ-氨丙基三甲氧基硅烷(KH792)为氨基化试剂,直接修饰酸化后的Fe3O4 得到磁性吸附材料.经响应面试验优化得到KH792对酸化Fe3O4 的最佳修饰条件为温度 82.5℃、pH=4.9,KH792添加量 1.8 mL,在最佳条件下,KH792直接修饰的酸化Fe3O4 对没食子酸吸附量为 22.8 mg/g,比市售Fe3O4 提高了 188%,且具备快速固液分离的能力、良好的稳定性及分散性.通过BET、Zeta电位、FTIR和XPS对直接修饰的产物性能进行了表征,结果表明,KH792与Fe3O4 表面羟基通过Fe-O-Si键结合,酸化提高了Fe3O4 表面羟基含量,因此也增强了KH792对Fe3O4 的修饰效果,本文制备的磁性产物可用于净化复杂样品基质中的有机酸.
Abstract
Endogenous substances,such as organic acids in food,can interfere with the detection of trace residues.To eliminate this effect,the magnetic adsorbent material was obtained by directly modifying acidified Fe3O4 with N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane(KH792)as an amination reagent.The optimal modification condi-tion of KH792 for acidified Fe3O4 was optimized by response surface methodology,which was 82.5℃,pH=4.9,and KH792 addition of 1.8 mL.Under these optimal conditions,the acidified Fe3O4 directly modified by KH792 has an adsorption capacity of 22.8 mg/g and shows a 188%increase in the adsorption capacity of the gallic acid compared to commercially available Fe3O4.Additionally,the modified Fe3O4 exhibits excellent performances of rapid solid-liquid separation,good stability,and dispersibility.The properties of the directly modified products were charac-terized by BET,Zeta potential,FTIR,and XPS.The results show that KH792 bonds on Fe3O4 surface hydroxyl group's by Fe-O-Si bonding,and acidification improves the number of hydroxyl groups on Fe3O4 surface,thus improv-ing the KH792 modification for Fe3O4.The magnetic products prepared in this work can be used for the purification of organic acids in complex sample matrices.
关键词
N-β-(氨乙基)-γ-氨丙基三甲氧基硅烷/酸化Fe3O4/直接修饰法/磁性吸附材料/修饰机制Key words
N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane/acidified Fe3O4/direct modification method/magnetic adsorbent materials/modification mechanism引用本文复制引用
基金项目
国家重点研发专项(2017YFF0211304)
福建省自然基金项目(2020J01098)
出版年
2024
NETL
NSTL
万方数据