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Preparation and Characterization of Metal-Organic Framework/Chitosan Nanocomposites to Dye Removal from Aqueous Media

Noori, Farnaz | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53136 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Shojaei Segherloo, Akbar; Molavi, Hossein
  7. Abstract:
  8. The amino groups present in the chemical structure of chitosan have made this material a prominent dye absorbents. But researchers have always taken steps to improve conditions and increase absorption. One of the materials that has attracted most researchers today is metal-organic frameworks. These porous materials with high surface area, optimum thermal resistance and adsorbent dye functional groups have been used as the reinfocing in the chitosan polymer field to adsorb anionic dye (methyl orange) from the aqueous media. One of metal-organic frameworks is UiO-66, which was selected as a reinforcing phase in the polymer field, due to its good stability in aqueous solutions, good thermal stability up to 500oc and high specific surface area (1276 m2/g). By adding nanoparticles to the polymeric field and examining the adsorption and FESEM images, the optimum percentage of nanoparticles of 1.5(w/w%) compared to chitosan was used as adsorbent. Morphology of adsorbents by addition of nanoparticles by XRD, TGA and AFM tests and adsorbent performance under different solution conditions such as pH, temperature, dosage of adsorbent, initial dye concentration, adsorption in the presence of NaCl and KCl salts, water contact angle, swelling and selectivity of mixtures of anionic dye methyl orange (MO) and cationic methylene blue (MB) was investigated and the results were recorded by UV-visible spectrophotometer. At all stages of nanoparticle addition to the polymer phase, improved adsorption conditions, increased equilibrium adsorption capacity and dramatically increased selectivity and improve reuseability of of adsorbents in adsorption-desorption cycles.

  9. Keywords:
  10. Chitosan ; Methyl Orange ; Methylene Blue ; Metal-Organic Framework ; Polymer Nanocomposits ; Dye Adsorption

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