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Fabrication of Magnetic Halloysite-Supported Catalyst for Reduction of Organic Dyes in Water

Latifipour, Mostafa | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53786 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Kazemeini, Mohammad; Sadjadi, Samaheh
  7. Abstract:
  8. A new magnetic catalytic nanocomposite of Hal-MT-Cys-Ag/MNCD was fabricated and utilized for catalyzing reductive de-colorization of methyl orange and rhodamin B in aqueous media at room temperature. To prepare this material, Cl-functionalized halloysite nanoclay was successively reacted with melamine and 2,4,6-trichloro-1,3,5-triazine to furnish multi-nitrogen containing ligand on halloysite surface. Then, magnetic carbon dots were crafted through a facile method and decorated with Ag nanoparticles and cysteine to furnish Cys-Ag/MNCD species. The final nanocomposite was obtained via incorporation of this latter species onto functionalized halloysite. This was characterized through the XRD, TEM, BET, FTIR, TGA, EDX and mapping analyses. The catalytic experiments confirmed that, through low loadings of the Hal-MT-Cys-Ag/MNCD composite reduction of both dyes were performed in ~ 1 min. This material could also be readily collected from the reaction media magnetically and displayed excellent recyclability with a slight decrease of its activity of at most ~ 6% up to 8 cycles. The kinetic and thermodynamic study of de-colorization reactions emphasized high catalytic performances of the synthesized nanocomposite. More precisely, activation energy, enthalpy and entropy were determined to be 48.15 kJ.mol-1, 45.65 kJ.mol-1 and -124.61 J.mol-1.K-1; respectively for the methyl orange while the corresponding values for the rhodamin B were found to be 11.03 kJ.mol-1, 8.53 kJ.mol-1 and -249.93 J.mol-1. K-1
  9. Keywords:
  10. Carbon Dots ; Catalyst ; Emission Reduction ; Quantum Dot ; Nanomagnetic Catalyst ; Dye Removal ; Rhodamine B ; Methyl Orange ; Halloysite

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