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Synthesis and Characterization of Modified Nanocomposites Using MOFs for Studying the Kinetics, Thermodynamics, and Mechanism of Removal Environmental Pollutants

Mirzaee Valadi, Farshad | 2022

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 55568 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Gholami, Mohammad Reza; Rahman Setayesh, Shahrbanoo
  7. Abstract:
  8. With the development of urbanization, industrialization, explosive population growth, and environmental degradation, the world is facing a serious challenge of water pollution. Nowadays, the water-soluble pollutant such as heavy metals and dyes brought a serious threat to the aquatic organisms and human health due to their non-degradability and carcinogenicity.With the purpose of future security and to restore ecological balance, it is essential to give much significance towards the removal of unwanted toxic contaminants from water resources. In this regard, the removal of toxic pollutants from wastewater using Metal-organic frameworks (MOFs) -based composites is considered as one of the most promising materials. In the present work, evaluation of the catalytic efficiency of the synthesized samples was done in a reduction reaction of 4-Nitrophenol to 4-Aminophenol in the existence of high amount of sodium borohydride (NaBH4) as a reducing agent, and the progress of the catalytic reaction was monitored using UV–visible spectrophotometry. The catalytic studies suggest that the as-prepared CuCo2O4/BiVO4, NiCo2O4/Bi2S3, Bi2S3/BiVO4 and MIL-88A/Cu2S nanocomposites effectively catalyze the reduction of 4-NP to 4-AP in the presence of NaBH4. The rate constant (Kapp) of MIL-88A/Cu2S nanocomposite is found to be 3.03 min−1, which proves its higher catalytic performance in comparison with the other samples Furthermore, other analyses such as kinetics and thermodynamics were carried out to understand the catalytic behavior. Also, work function was calculated by density functional theory (DFT) to investigate the reaction mechanism. On the other hand, the adsorption of various contaminants by MOFs is influenced by various factors including pH, temperature and initial concentration. In this study, La-MOF-NH2@Fe3O4 (magnetic-MOF) was used as an efficient, ultrafast, and selective adsorbent for the separation of Congo Red (CR) with 92.02% removal after 2 min. On the other hand, MOF-808/chitosan nanocomposite was developed for simultaneous and efficient adsorption- separation of Cr(VI)
  9. Keywords:
  10. Nanocomposite ; 4-Nitrophenol ; Density Functional Theory (DFT) ; Metal-Organic Framework ; Thermodynamics ; Work Function ; Environmental Pollutant ; 4-Aminophenol ; Pollution Removal

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