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Designing of Transition Metal Oxide Spinels and their Applications in Kinetics Study of Electrochemical Degradation of Organic Pollutants

Khandan Dezfoli, Fatemeh | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57965 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Rahman Setayesh, Shahrbanoo
  7. Abstract:
  8. Metronidazole is an antibiotic which widely used in medical applications, resulting in its presence both in water and wastewater. The electro-Fenton process has shown high efficiency in the non-selective degradation of organic pollutants. In this study, CuCexFe2-xO4/CuO nanocomposites were synthesized using the hydrothermal method and utilized for the degradation of metronidazole in the electro-Fenton process. The characterization of the catalysts was performed by FT-IR, FE-SEM, XRD, and ICP techniques.The XRD patterns confirmed the formation of monoclinic copper(II) oxide structure as well as the cubic crystal structure of CuCe0.05Fe1.95O4 spinel. The FE-SEM images confirmed the formation of nanosheets of copper(II) oxide and the presence of CuCe0.05Fe1.95O4 nanoparticles on the surface of copper(II) oxide in the synthesized nanocomposite. Identification of elements type and percentage of constituent elements in synthesized nanocatalyst and nanocomposite were determined using the results of EDX spectra and ICP experiments. The effects of parameters such as current intensity, catalyst dosage, pH, initial concentration of metronidazole pollutant, and electrolyte was investigated for determining the optimum conditions of the electro-Fenton process. Under the optimum conditions (current intensity of 150 mA, pH of 3, catalyst dosage of 0.1 g, sodium sulfate electrolyte concentration of 0.5 M, and initial pollutant concentration of 100 ppm), the metronidazole degradation efficiency and COD removal reached 97% and 64%, respectively, within 120 minutes. Additionally, after 300 minutes of the electro-Fenton process, the COD removal efficiency reached 90%. The use of the CuCe0.05Fe1.95O4/CuO catalyst for six consecutive cycles resulted in only a 3% decrease in the process efficiency, indicating the high recyclability and stability of the CuCe0.05Fe1.95O4/CuO catalyst. The analysis of experimental kinetic data showed that the degradation of metronidazole pollutant follows pseudo-first-order kinetics
  9. Keywords:
  10. Metronidasole ; Electro-Fenton Method ; Cobalt Ferrite/Copper Oxide (CoFe2O4/CuO)Nanocomposite ; Copper Oxide Nanoparticles ; Electrochemical Degradation ; Heterogeneous Electro-Fenton Method ; Transition Metal Oxides ; Organic Pollutant

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