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Polybutylene Terephethalate-based Magnetic Nanofibers for Micro-solid phase Extraction of Triazines from Aquatic Media

Najafi Mobara, Mahdieh | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48044 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Bagheri, Habib
  7. Abstract:
  8. Porosity and high surface area is a profound concept for creating advance materials. Nanofibers are an important class of nanomaterials with high surface to volume ratio as a result of long lengths and nano-to-micro-scale diameters. Electrospinning is a simple method for producing nanofibers from different polymers and composites and prepare highly efficient sorbents. Polymeric nanocomposites are claimed to exhibit markedly improved mechanical, magnetic, thermal and electrical properties. Magnetic iron oxide nanoparticles have gained great attentions due to their low toxicity, stability and biocompatibility and have been extensively used to induce magnetic property to the desired sorbents. In this project, magnetic¬¬¬-polybutylene terephthalate-based nanofibers were prepared by electrospinning technique and implemented for extraction of some selected triazines. Due to the presence of magnetic nanoparticles, improved extraction efficiency is expected while the nanocomposite-sorbent could be collected by an external magnet. Also, the effect of different parameters on the extraction and desorption processes including the concentration of magnetic nanoparticles, sample pH, extraction time, sample volume, type of desorption solvent, solvent volume and desorption time were investigated and optimized. Under the optimum condition, the detection limits were in the range of 0.02-0.05 ng mL-1, while the limits of quantification was between 0.1 and 0.2 ng mL-1. The linear dynamic range was 0.1-100 ng mL-1 and the relative standard deviations (%RSD) for three replicates were 4-9%. The developed method was extended to the real water samples and the relative recoveries were in the range of 86-103%, indicating that the prepared sorbent is suitable for extraction of triazines from environmental samples
  9. Keywords:
  10. Electrospinning ; Triazins ; Gas Chromatography/Mass Spectrometry (GC/MS) ; Equeous Media ; Magnetic Micro-solid Phase Extraction ; Magnetic Nanofiber ; Polybutylene Terephthalate

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