Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules & College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, PR China.
Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules & College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, PR China.
J Chromatogr A. 2020 Dec 6;1633:461627. doi: 10.1016/j.chroma.2020.461627. Epub 2020 Oct 14.
A Poly (3,4-ethylenedioxothiophene) (PEDOT)/UiO-66 composite was electrodeposited on an etched stainless-steel wire as head-space solid-phase microextraction (HS-SPME) coating. A robust, well controlled thickness, and uniform coating of metal organic framework composites can be realized by the electrodeposited strategy. The incorporated UiO-66 not only enhanced the uniformity and stability of the composite coating, but also effectively decreased the stacking phenomenon of PEDOT and improved its extraction efficiency, which was over 100 times higher than that of the PEDOT coating without UiO-66. The composite coating was used to enrich seven types of volatile organic compounds (VOCs) in ion-exchange resins, including methyl cyclohexane, benzene, toluene, ortho-xylene, styrene, para-xylene and divinyl-benzene. The results of adsorption isotherm analysis showed that π stacking effect played dominant role between the composite coating and VOCs in the extraction process. The composite coating was characterized by scanning electron microscopy, X-ray diffraction, Fourier transform infrared and thermogravimetric analysis, respectively. A determination method for seven kinds of VOCs was established by HS-SPME coupled with gas chromatography-flame ionization detection (GC-FID). Under the optimal experimental conditions, the detection linear range (LRs) was 0.09-100 ng mL, and the detection limit (LODs) was 0.03-0.06 ng mL (S/N = 3). The method was applied for the migration detection of VOCs in four types of ion-exchange resin, which showed satisfactory recovery (84.5-117.2%).
聚（3,4-亚乙基二氧噻吩）（PEDOT）/UiO-66 复合材料被电沉积在蚀刻的不锈钢丝上作为顶空固相微萃取（HS-SPME）涂层。通过电沉积策略可以实现金属有机骨架复合材料的坚固、良好控制的厚度和均匀涂层。掺入的 UiO-66 不仅增强了复合涂层的均匀性和稳定性，而且有效地减少了 PEDOT 的堆积现象，提高了其萃取效率，是没有 UiO-66 的 PEDOT 涂层的 100 多倍。该复合涂层用于富集离子交换树脂中的七种挥发性有机化合物（VOCs），包括甲基环己烷、苯、甲苯、邻二甲苯、苯乙烯、对二甲苯和二乙烯基苯。吸附等温线分析结果表明，在萃取过程中，复合涂层和 VOCs 之间π堆积效应起主导作用。复合涂层分别通过扫描电子显微镜、X 射线衍射、傅里叶变换红外和热重分析进行了表征。通过 HS-SPME 与气相色谱-火焰离子化检测（GC-FID）相结合，建立了七种 VOCs 的测定方法。在最佳实验条件下，检测线性范围（LRs）为 0.09-100ng mL，检测限（LODs）为 0.03-0.06ng mL（S/N=3）。该方法用于四种类型的离子交换树脂中 VOCs 的迁移检测，回收率令人满意（84.5-117.2%）。
