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Photocatalytic Degradation of Organic Pollutants in the Presence of Nanocomposites Based on Graphitic Carbon Nitride under Visible Light Illumination

Hasanvandian, Farzad | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55363 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Hamzehlouyan, Tayebeh; Rahman Setayesh, Shahrbanoo
  7. Abstract:
  8. The susceptible light-harvesting and tremendous reduction capability along with the potentiality (photo)electrochemical merits of the thiospinels like CuCo2S4 (CCS) bring forth appreciably an advancement in efficacious photocatalytic reactions. However, scant oxidation potential originated from 3p orbitals of sulfur atoms puts a damper on their performance and is even conducive to self-oxidation. In this research, the surfactant/template free of hierarchical CCS thiospinels was synthesized using solvothermal sulfidation of the affordable glycerate-based CuCo-alkoxide and successfully was embedded with Z-scheme V2O5 deposited on wrinkled g-C3N4 lamella (VO-UCN) in the interest of developing superior active ternary VO-UCN@CCS nanophotocatalyst for detoxification of levofloxacin (LVOF). The exceptional physicochemical properties of as-constructed samples were scrutinized via diverse characterization methods. After the optimization of CCS loading (30 w.t.%) and operational parameters, VO-UCN@CCS(30) demonstrated ultramost photocatalytic efficiency toward LVOF decomposition (96%) within 120 min reaction, which was 9.9, 7.2, and 19.0 fold greater than the pristine VO, UCN, and CCS, respectively. In the matter of catalyst reusability, the VO-UCN@CCS(30) could retain 87% of initial performance after five consecutive disintegration cycles, and no evidence of variation was observed in the authenticated crystal structure. After thoroughly mineralization of the LVOF under ternary VO-UCN@CCS(30) nanocomposite for a duration of 300 min, ICP analysis exhibited the inconsequential amount of leached metals in the interest of catalyst stability. Encompassing the CCS spheres into the superb stabilized heterogeneous VO-UCN prevails them against self-oxidation and harsh surrounding conditions. The combination of the light-harvesting and modulated electronic traits of the configuration of CCS with the Z-scheme VO-UCN system, this study shed light on a new generation of efficacious sulfide-based nanocomposites for the photo-decontamination of non-biodegradable pollutants
  9. Keywords:
  10. Photodegradation ; Thiospinel CuCo2S4 (CCS) ; Sulfide-Based Nanocomposite ; Levofloxacin ; Exfoliated Carbon Nitride ; Antibiotic ; Graphitic Carbon Nitride ; Photocatalytic Degradation ; Organic Pollutant

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