磁性纳米复合物的制备及对铜离子(Ⅱ)的传感检测  

Synthesis of Magnetic Nanocomposites and Sensitive Detection for Copper(Ⅱ)

作　　者：焦媛[1] 刘付永[1] 王松柏[1] 双少敏[1] 董川[1] 

机构地区：[1]山西大学化学化工学院,山西大学环境科学研究所,太原030006

出　　处：《应用化学》2017年第1期111-117,共7页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金资助项目(21575084,21475080);山西省高等学校科技创新项目(2016105)~~

摘　　要：采用化学共沉淀法合成硅包覆的磁性纳米粒子Fe_3O_4@SiO_2,进一步通过六亚甲基二异氰酸酯将吡哆酰肼分子(Pyh)接枝到Fe_3O_4@SiO_2表面,制得功能化的磁性纳米复合物(Fe_3O_4@SiO_2-Pyh)。通过傅里叶变换红外光谱、透射电子显微镜、X射线衍射等技术手段对其结构、形貌和磁性能进行了表征。Fe_3O_4@SiO_2-Pyh粒子具有规则的核壳结构,粒径分布在50~55 nm,壳层厚度约为15 nm。Fe_3O_4@SiO_2-Pyh结构中含有酰腙类活性基团—CO—NH—N=CH—,能与Cu^(2+)形成稳定的配合物,在此基础上采用紫外可见吸收光谱特性建立了测定Cu^(2+)的分析方法,线性范围为3.4×10^(-7)~4.5×10^(-6)mol/L,检出限为1.03×10^(-7)mol/L。此外,利用Fe_3O_4@SiO_2-Pyh良好的磁响应,通过外部磁场能够有效地除去水中过量的铜离子,在环境领域具有潜在的应用价值。The magnetic nanoparticles（ NPs） coated with silica NPs（ Fe3O4@ SiO2） were prepared by chemical co-precipation method. A multifunctional magnetic nanocomposite（ Fe3O4@ SiO2-Pyh） was fabricated by grafting pyridoxal hydrazide（ Pyh） to the surface of Fe3O4@ SiO2 NPs via hexamethylene diisocyanate. The structure,morphology,and magnetic property of Fe3O4@ SiO2-Pyh were characterized by Fourier transform infrared spectroscopy,transmission electron microscopy,and X-ray powder diffraction. The Fe3O4@ SiO2-Pyh has a clear core shell architecture,in which an average particle diameter is 50 - 55 nm with about 15 nm SiO2 shell. Fe3O4@ SiO2-Pyh contains—CO—NH—N=CH— active groups,which can coordinate with Cu^2 ＋to form stable complex. Based on this principle we established an analytical method for the determination of Cu^2 ＋,which was characterized by UV-Vis spectroscopy. The linear range of detecting Cu^2 ＋concentration is3. 4 × 10^-7- 4. 5 × 10^-6mol/L with detection limit 1. 03 × 10^-7mol/L. Moreover, the nanocomposites display superparamagnetic properties,which can be used for effective separation of excess Cu^2 ＋from the liquid phase by applying an external magnetic field. As-synthesized Fe3O4@ SiO2-Pyh can be a good candidate for selective detection and simple removal of Cu^2 ＋in environmental fields.

关 键 词：吡哆酰肼 磁性纳米复合物 铜离子(Ⅱ) 紫外可见光谱 

分 类 号：O657[理学—分析化学]