磁性纳米复合物的制备及对铜离子(Ⅱ)的传感检测

doi:10.11944/j.issn.1000-0518.2017.01.160385

摘要/Abstract

摘要：

采用化学共沉淀法合成硅包覆的磁性纳米粒子Fe₃O₄@SiO₂,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Fe₃O₄@SiO₂表面,制得功能化的磁性纳米复合物(Fe₃O₄@SiO₂-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。 Fe₃O₄@SiO₂-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。 Fe₃O₄@SiO₂-Pyh结构中含有酰腙类活性基团—CO—NH—N=CH—,能与Cu²⁺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Cu²⁺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Fe₃O₄@SiO₂-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。

关键词: 吡哆酰肼, 磁性纳米复合物, 铜离子(Ⅱ), 紫外可见光谱

Abstract:

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 Cu²⁺ to form stable complex. Based on this principle we established an analytical method for the determination of Cu²⁺, which was characterized by UV-Vis spectroscopy. The linear range of detecting Cu²⁺ concentration is 3.4×10^-7~4.5×10^-6 mol/L with detection limit 1.03×10^-7 mol/L. Moreover, the nanocomposites display superparamagnetic properties, which can be used for effective separation of excess Cu²⁺ 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 Cu²⁺ in environmental fields.

Key words: pyridoxal hydrazide, magnetic nanocomposite, copper ion(Ⅱ), UV-Vis spectroscopy

焦媛, 刘付永, 王松柏, 双少敏, 董川. 磁性纳米复合物的制备及对铜离子(Ⅱ)的传感检测[J]. 应用化学, 2017, 34(1): 111-117.

JIAO Yuan, LIU Fuyong, WANG Songbai, SHUANG Shaomin, DONG Chuan. Synthesis of Magnetic Nanocomposites and Sensitive Detection for Copper(Ⅱ)[J]. Chinese Journal of Applied Chemistry, 2017, 34(1): 111-117.

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