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Preparation and characterization of a new CdS–NiFe2O4/reduced graphene oxide photocatalyst and its use for degradation of methylene blue under visible light irradiation

Bagherzadeh, M ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1007/s11164-018-3466-1
  3. Abstract:
  4. In this paper, CdS nanoparticles as a visible light active photocatalyst were coupled by NiFe2O4 and reduced graphene oxide (rGO) to form CdS–NiFe2O4/rGO nanocomposite by facile hydrothermal methods. The CdS–NiFe2O4/rGO nanocomposite shows enhanced photocatalytic activity for the degradation of methylene blue (MB) under visible light illumination. In addition to improved photocatalytic performance, this prepared nanocomposite shows increased photostability and is magnetically separable from the aqueous media. The degradation rate constant (kapp) of the optimized photocatalyst, i.e. CdS–NiFe2O4 (0.05)/rGO 25 wt% nanocomposite, was higher than the corresponding CdS and NiFe2O4 nanoparticles by factors of 11.1 and 8.9, respectively. The synergistic interactions between CdS, NiFe2O4 and rGO lead to enhanced surface area, reduced aggregation of the nanoparticles, decreased the recombination of photogenerated electron–hole pairs, and increased the charge separation efficiency and effective electron–hole generation transfer. According to the obtained results, a proposed mechanism of the photodegradation of MB under visible light irradiation is finally mentioned. © 2018, Springer Science+Business Media B.V., part of Springer Nature
  5. Keywords:
  6. Photocatalyst ; Reduced graphene oxide ; Aromatic compounds ; Cadmium sulfide ; Degradation ; Graphene ; II-VI semiconductors ; Iron compounds ; Irradiation ; Light ; Nanocomposites ; Nanoparticles ; Nickel compounds ; Photocatalysts ; Photodegradation ; Rate constants ; Degradation rate constants ; Methylene blue ; Nickel ferrite ; Photocatalytic performance ; Reduced graphene oxides ; Reduced graphene oxides (RGO) ; Visible light active photocatalysts ; Visible-light irradiation ; Sulfur compounds
  7. Source: Research on Chemical Intermediates ; Volume 44, Issue 10 , 2018 , Pages 5953-5979 ; 09226168 (ISSN)
  8. URL: https://link.springer.com/article/10.1007/s11164-018-3466-1