Core–shell electrospun polybutylene terephthalate/polypyrrole hollow nanofibers for micro-solid phase extraction
| Autor: | Omid Rezvani, Habib Bagheri, Solmaz Banihashemi |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Polymers
Polyesters Nanofibers 02 engineering and technology Solid-phase microextraction Polypyrrole 01 natural sciences Biochemistry Gas Chromatography-Mass Spectrometry Analytical Chemistry chemistry.chemical_compound Desorption Pyrroles Solid phase extraction Solid Phase Microextraction Detection limit Chromatography Triazines Chemistry Osmolar Concentration 010401 analytical chemistry Organic Chemistry General Medicine 021001 nanoscience & nanotechnology Electrospinning 0104 chemical sciences Polybutylene terephthalate Nanofiber 0210 nano-technology Porosity Water Pollutants Chemical |
| Zdroj: | Journal of Chromatography A. 1434:19-28 |
| ISSN: | 0021-9673 |
| DOI: | 10.1016/j.chroma.2015.12.082 |
| Popis: | In the present work, a new micro-solid phase extraction (μ-SPE) sorbent as an extracting medium based on core-shell nanofibers was synthesized by electrospinning. The core-shell nanofibers of polyvinylpyrrolidone-Polybutylene terephthalate/polypyrrole (PVP-PBT/PPy) were electrospun and subsequently, modified hollow nanofibers were prepared by removing the central PVP moiety. Moreover, conventional PBT/PPy was also prepared for the comparison purposes. The homogeneity and the porous surface structure of the core-shell nanofibers were confirmed by scanning electron microscopy (SEM). The applicability of the fabricated nanofibers-coating was examined by immersed μ-SPE of some selected triazine herbicides from aqueous samples and wheat grains. Subsequently, the extracted analytes were transferred into a gas chromatography (GC) after solvent desorption. Influencing parameters on the morphology of nanofiber such as elctrospinning parameters and the weight ratio of components were optimized. In addition, effects of different parameters influencing the extraction efficiency including extraction temperature, extraction time, ionic strength, sample pH, desorption temperature, and desorption time were investigated and optimized. Eventually, the developed method was validated by gas chromatography-mass spectrometry (GC-MS). At the optimum conditions, the relative standard deviation values for real water samples spiked with the selected triazines at 1 ng mL(-1) were 4-8% (n=3) and the limits of detection for the studied compounds were between 50 and 90 ng L(-1). The calibration curves for the selected triazines were in the range of 0.3-500 ng mL(-1) and regression coefficients (R(2)) were between 0.9985 and 0.9996. |
| Databáze: | OpenAIRE |
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