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Application of Three–dimensional Molybdenum Oxide Based Metal Organic Framework in Needle Trap Extraction of Chlorobenzenes in Environmental Samples

Karimi Zandian, Faezeh | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50670 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Bagheri, Habib; Abbasi, Alireza
  7. Abstract:
  8. In this study, a three dimensional molybdenum oxide based coordination polymer of{(M¬o2O6)(4,4'–bpy)}n was synthesized by solvothermal process. Excellent properties of the fabricated metal–organic framework such as crystallinity, porosity, sufficient thermal stability and possession of different interactions encouraged us to employ it as a novel extraction phase in sample preparation. Extraction efficiency of the MOF–based sorbent was evaluated in needle trap extraction of some chlorobenzenes as volatile aromatic organic compounds in conjugation with gas chromatography–mass spectrometry. To achieve maximum efficiency and sensitivity, influential parameters including desorption time and temperature as well as ionic strenght, sample stirring rate, the headspace flow rate through the sorbent bed, extraction temperature and time were investigated and optimized. Dynamic linear range was in the range of 1–1000 ng L-1 and the limits of detection values were between 0.2 and 2 ng L-1. The relative standard deviations for three replicates at the concentratin levels of 10 and 200 ng L-1 were in the range of 5–12%. The prepared MOF was applied for analyzing different environmental samples such as Tehran tap water, Zayandeh Rood river water, Karaj river water, Tehran oil refinery water, and the water from an agriculture field in South of Tehran. Relative recoveries for the spiked samples at two concentration levels of 10 and 200 ng L-1 were obtained in the range of 84–114
  9. Keywords:
  10. Mass Spectrometry-Gas Chromatography ; Needle Trap Extraction ; Chlorobenzene ; Metal-Organic Framework ; Aromatic Compounds

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