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Kinetics Investigation of Environmental Pollutants Degradation in Advanced Oxidation Processes Using Metal Oxide Nanocatalysts

Nazari, Pegah | 2020

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 53532 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Rahman Setayesh, Shahrbanoo
  7. Abstract:
  8. In this project, metal oxides loaded on different supports were used in the heterogeneous electro-Fenton (EF) process for organic pollutants removal. At first, Fe3O4/AC was synthesized for catechol degradation as a phenolic compound. 98.2% removal of catechol was achieved by operational conditions optimization. The catalytic activity of Fe3O4/AC was remained constant after 6 cycles. In the other study, reduced graphene oxide was used as a support for the magnetite nanoparticle catalyst. The catalytic activity of Fe3O4/rGO in EF degradation of reactive red 195 (RR195) dye was studied and 93.34% removal was obtained. Response surface methodology (RSM) was used and a quadratic model with excellent agreement with the experimental data was presented. The pseudo-first-order kinetic for dye degradation was obtained. In the other part of the project, copper and iron oxide with delafossite structure as a catalyst was synthesized for catechol degradation. After characterization of Fe/CuFeO2/rGO with different techniques and optimization of reaction conditions, 99% catechol removal was recorded. The degradation pathway was proposed by the main intermediates and important oxidants detection. The efficiency of the catalyst remained constant after 6 cycles. In the other study, bimetal oxide (CuFeO2) loaded on non-inert support (CeO2) was synthesized for the first time and its catalytic activity was investigated in acid orange 7 (AO7) degradation. The AO7 degradation pathway was proposed by the radicals scavenging experiments and main intermediates detection. The synthesized catalyst with high performance in the salty and real effluents represented that it could be an appropriate catalyst for the EF process in wastewater treatment.CuFeO2/Al2O3 was used in the catalytic wet peroxide oxidation (CWPO) of anionic pollutants (catechol and RR195 dye) degradation. A detailed study of the adsorption mechanism of anionic pollutants on the catalyst surface was performed and then CWPO was optimized. The Langmuir adsorption isotherm has better agreement with experimental data for catechol and RR195 dye. The pseudo-first-order model described the kinetics of the degradation and the major oxidants and degradation path were determined. The presence of several contaminants and ionic background effect was studied on the catalytic system efficiency and it was revealed that the system has maintained its efficiency. The catalytic activity of CuFeO2/Al2O3 catalyst also remained constant in seven cycles. The results displayed that the synthesized catalyst could be a suitable and effective catalyst in water treatment by the CWPO process
  9. Keywords:
  10. Advanced Oxidation Process ; Chemical Kinetic ; Nano Catalyst ; Metal Oxides ; Electro-Fenton Method ; Degradation Pollutants ; Environmental Pollutant

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