Preparation and characterization of Au–ZrO2–SiO2 nanocomposite spheres and their application in enrichment and detection of organophosphorus agents
Preparation and characterization of Au–ZrO2–SiO2 nanocomposite spheres and their application in enrichment and detection of organophosphorus agents
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DOI：
10.1039/c2jm15129d
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发表时间：
2012-02
影响因子：
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通讯作者：
Yuqi Yang;Haiyang Tu;Aidong Zhang;Dan Du;Yuehe Lin
中科院分区：
文献类型：
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作者：
Yuqi Yang;Haiyang Tu;Aidong Zhang;Dan Du;Yuehe Lin
制备了Au-ZrO 2-SiO2纳米复合微球，并将其用作固相萃取有机磷农药的选择性吸附剂。研制了一种基于Au-ZrO 2-SiO2修饰电极的非酶电化学传感器，用于有机磷农药的选择性检测。通过正丁醇锆（TBOZ）在SiO2微球表面的水解缩合反应和金纳米粒子的引入，制备了Au-ZrO 2-SiO2纳米复合微球。透射电子显微镜和X-射线光电子能谱进行表征的纳米复合材料球的形成。利用ZrO 2与磷酸基团的特异性亲和性，在5 min内实现了OP的快速萃取。该检测方法产生的对氧磷-乙基的浓度范围很宽，从1.0到500 ng mL−1，检测限为0.5 ng mL−1。这种选择性和灵敏度的方法为OP的富集和检测提供了很大的希望。
Au–ZrO2–SiO2 nanocomposite spheres were synthesized and used as selective sorbents for the solid-phase extraction (SPE) of organophosphorous agents. A non-enzymatic electrochemical sensor based on a Au–ZrO2–SiO2 modified electrode was developed for the selective detection of organophosphorous pesticides (OPs). The Au–ZrO2–SiO2 nanocomposite spheres were synthesized by the hydrolysis and condensation of zirconium n-butoxide (TBOZ) on the surface of SiO2 spheres and then the introduction of gold nanoparticles on the surface. Transmission electron microscopy and X-ray photoelectron spectroscopy were performed to characterize the formation of the nanocomposite spheres. Fast extraction of OP was achieved by the Au–ZrO2–SiO2 modified electrode within 5 min via the specific affinity between zirconia and the phosphoric group. The assay yields a broad concentration range of paraoxon-ethyl from 1.0 to 500 ng mL−1 with a detection limit of 0.5 ng mL−1. This selective and sensitive method holds great promise for the enrichment and detection of OPs.