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Enhancement of the Photocatalytic Activity of Copper Cobaltite (CuCo2O4) and Studying the Kinetics of Degradation of Organic Pollutants

Tayebi, Saheleh | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58644 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Rahman Setayesh, Shahrbanoo
  7. Abstract:
  8. In this project, CuCo2O4/g-C3N4-Co3O4 nanocomposite was synthesized and used to degrade and remove the antibiotic levofloxacin in the photocatalytic degradation process. This nanocomposite was characterized using XRD, FE-SEM, FT-IR, DRS and PL methods. The results of XRD patterns confirmed the formation of spinel crystal structure of Co3O4 nanoparticles and CuCo2O4 nanospheres. FT-IR spectroscopy confirmed the presence of chemical bonds in the catalysts. FE-SEM images showed the formation of Co3O4 nanoparticles, CuCo2O4 nanospheres and g-C3N4 nanoplates and how they are placed on each other. By using DRS analysis, the absorption edge wavelength and energy gap of the synthesized catalysts were obtained. Also, the results of PL analysis showed effective separation of electron-hole pairs in CuCo2O4/g-C3N4-Co3O4 nanocomposite and improved photocatalytic activity. In the photocatalytic degradation process, a 300 W Xenon lamp was used as a source of visible light radiation. The effect of catalyst amount, pollutant level and pH parameters were investigated to determine the optimal conditions of the photocatalytic process. In optimal conditions (catalyst amount 0.7 g/L, pollutant concentration 20 mg/L and neutral pH), the antibiotic degradation efficiency of levofloxacin was 93% and the COD removal rate was 58% in 120 minutes. The kinetics of the photocatalytic degradation process of levofloxacin antibiotic was investigated and the results showed that this process follows pseudo-first order kinetics. Specific scavengers were used to identify active radical species during the photocatalytic degradation process, and the results showed that hydroxyl radicals, superoxide and holes are mainly responsible for the degradation process of levofloxacin antibiotic. Also, the evaluation of nanocomposite stability and recyclability showed that this catalyst has high stability and recyclability
  9. Keywords:
  10. Photocatalyst ; Photocatalytic Degradation ; Graphitic Carbon Nitride ; Cobalt Oxide Nanoparticle ; Levofloxacin ; Copper Cobaltite Nanospheres

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