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Preparation and Application of Superhydrophobic Melamine Formaldehyde Modified by Graphene Sorbent for Extraction of Chlorobenzenes from Aqueous Samples by Needle-trap Device

Dorabadi Zare, Farzaneh | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49266 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Bagheri, Habib
  7. Abstract:
  8. Superhydrophobic surfaces have attracted much attention in recent years due to their unique properties. Artificial superhydrophobic surfaces can be fabricated by employing chemical modifying a hierarchical structured surface (micro- and nanostructures) with a low surface free energy material. In this report, we used a simple one-step coating process to prepare superhydrophobic sorbents with a large surface area. Surface chemistry and porosity are fundamental parameters for an efficient sorbent capable of extracting low levels of analytes. Considering physical and chemical peroperties of chlorobenzenes, superhydrophobic materials make to be good sorbents. So in this project melamine formaldehyde sponge as a porous substrate was modified by graphene as an organic low surface free energy material. Needle-trap device with a dynamic headspace sampling technique was applied to extract chlorobenzenes from aqueous samples and introduced into a conventional GC-FID injector. After optimization of experimental parameters, figures of merit were obtained as follows: LOD ranges from 0.2 to 1.5 ng mL-1, LOQ ranges from 0.8 to 5.0 ng mL-1 and LDR ranges from 1 to 400 ng mL-1. RSD% is less than 19% and for water sample analysis relative recovery ranges from 80 to 119%
  9. Keywords:
  10. Gas Chromatography ; Chlorobenzene ; Water Samples ; Superhydrophobic Surfaces ; Needle Trap Device ; Headspace Solvent Microextraction ; Melamine Formaldehyde Foam ; Melamine Formaldehyde Sponge Modified by Graphene

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