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Fe_(3)O_(4)得到磁性吸附材料。经响应面试验优化得到KH792对酸化Fe_(3)O_(4)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Fe_(3)O_(4)对没食子酸吸附量为22.8 mg/g,比市售Fe_(3)O_(4)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Fe_(3)O_(4)表面羟基通过Fe−O−Si键结合,酸化提高了Fe_(3)O_(4)表面羟基含量,因此也增强了KH792对Fe_(3)O_(4)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。
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 Fe_(3)O_(4)with N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane(KH792)as an amination reagent.The optimal modification condition of KH792 for acidified Fe_(3)O_(4)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 Fe_(3)O_(4)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 Fe_(3)O_(4).Additionally,the modified Fe_(3)O_(4)exhibits excellent performances of rapid solidliquid separation,good stability,and dispersibility.The properties of the directly modified products were characterized by BET,Zeta potential,FTIR,and XPS.The results show that KH792 bonds on Fe_(3)O_(4)surface hydroxyl group's by Fe−O−Si bonding,and acidification improves the number of hydroxyl groups on Fe_(3)O_(4)surface,thus improving the KH792 modification for Fe_(3)O_(4).The magnetic products prepared in this work can be used for the purification of organic acids in complex sample matrices.
作者
周书威
傅红
杨方
ZHOU Shuwei;FU Hong;YANG Fang(Fuzhou Customs Technical Center,Fuzhou 350001,China;College of Biological Science and Engineering,Fuzhou University,Fuzhou 350108,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2024年第4期1977-1986,共10页
Acta Materiae Compositae Sinica
基金
国家重点研发专项(2017YFF0211304)
福建省自然基金项目(2020J01098)。
