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A Novel Magnetic Molecularly Imprinted Polymers Nanoparticle as Extracting Medium For Micro-Solid Phase Extraction

Yahya Baktash, Mohammad | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45219 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Bagheri, Habib
  7. Abstract:
  8. This thesis cantain two section. In the first section a novel extracting medium based on magnetic molecularly imprinted polymers (MIPs) nanoparticles was synthesized by chemical polymerization for micro-solid phase extraction. In this work, the modified chitosan magnetite nanoparticles (MNP-CS) was synthesized by co-precipitating Fe2+ and Fe3+ in the chitosan solution [1,2]. The characteristic properties of Fe3O4@MIPs nanoparticles were determined using Fourier transform infrared spectrometer. Extraction efficiency of the novel extracting medium was compared with MNP-CS sorbents for the determination of RhB in aqueous samples, via quantification by spectrofluorimetry. The obtained results showed that Fe3O4@MIP nanoparticles have a prominent efficiency compared to other sorbents. Influencing parameters on the morphology of Fe3O4@MIP nanoparticles such as weight ratio of components, reaction time and temperature were optimized. In addition, Effect of different parameters influencing the extraction efficiency of RhB including desorption solvent, amount of sorbent, desorption time, sample pH, ionic strength, extraction time and stirring rate were investigated and optimized.
    Under optimum conditions a linear calibration curve in the range of 4 -500 µg L−1 of RhB with R2 = 0.9952 was obtained. The limits of detection (3Sb) and quantification (10Sb) of the method were 1 and 4 µg L−1 (n=3), respectively. The relative standard deviation (RSD) for 10.00 µg L−1 of RhB was 6.6% (n = 3). The relative recovery for the determination of RhB in dishwashing liquid, matches tips Lipstick samples were 87- 98%.
    In the second section, cadmium selenide quantum dots were synthesized in aqueous environment. Synthesized quantum dots were used to measure formaldehyde. Effect of different parameters influencing the determination of formaldehyde including , amount of QD, Interaction time, sample pH, were investigated and optimized.
    Under optimum conditions a linear calibration curve in the range of 1.7 -28 mg L−1 of formaldehyde with R2 = 0.9933 was obtained. The limits of detection (3Sb) and quantification (10Sb) of the method were 0.71 and 1.7 mg L−1 (n=3), respectively. The relative standard deviation (RSD) for 10.00 mg L−1 of formaldehyde was 2.1% (n = 3)
  9. Keywords:
  10. Formaldehyde ; Magnetic Nanocomposite ; Molecularly Imprinted Polymers ; Rhodamine B ; Quantum Dot ; Cadmium Selenides

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