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Synthesis and Characterization of Chitosan-Modified Metal-Organic Framework to Remove Contaminants from Aquatic Environment

Amin, Parsa | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54440 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Hamzehluyan, Tayebeh; Shojaei Segherloo, Akbar; Molavi, Hossein
  7. Abstract:
  8. In the present work, a series of nanohybrids based on ZIF-8 as a physicochemical stable metal-organic framework (MOF) and different amounts of Chitosan (CS) (0.5–15 wt%) were synthesized and used as adsorbents for anionic (Congo Red, CR) and cationic (malachite green, MG) dyes from contaminated water in single and binary dye solutions. The single adsorbents and their nanohybrids were characterized by FESEM, FTIR, XRD, TGA, BET, and zeta potential measurements. The experimental adsorption results displayed that the synthesized nanohybrids presented higher adsorption capacity for anionic dyes compared to cationic dyes in both single and binary dye solutions. It was deduced that the electrostatic interactions, pi-pi stacking and hydrogen bonding between dye molecules and adsorbents were the primary mechanisms for selective adsorption of these dyes onto synthesized nanohybrids. Additionally, the results suggested that the maximum improvement in dye adsorption was achieved at certain concentration of CS in the nanohybrid, e.g. at 2 wt% CS named CS-ZIF-2, which was associated to its microstructure. CS-ZIF-2 nanoparticles displayed an increase of 21% in CR adsorption capacity in removal rate compared to parent ZIF-8 nanoparticle.
  9. Keywords:
  10. Chitosan ; Dye Removal ; Metal-Organic Framework ; Hybrid Nanoparticles ; Selective Absorption ; Anionic Nanoparticles ; Zeolite Imidazolate Framework ; Aquatic Media

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