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Spinel MgAl2O4 nanospheres coupled with modified graphitic carbon nitride nanosheets as an efficient Z-scheme photocatalyst for photodegradation of organic contaminants

Zehtab Salmasi, M ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1016/j.apsusc.2022.152615
  3. Publisher: Elsevier B.V , 2022
  4. Abstract:
  5. In this contribution, spinel MgAl2O4 nanospheres prepared by the combustion method were coupled with thermally-exfoliated g-C3N4 nanosheets (TE-GCN) through an efficient isoelectric point-assisted calcination technique. Physical characteristics of the synthesized nanocomposite were understudied utilizing the XRD, FT-IR, FE-SEM, TEM, BET-BJH, UV–Vis DRS, PL, and EIS analyses. This material was used as a novel nano-photocatalyst for degradation of reactive red 195 (RR195) industrial dye contaminant. Results revealed that, a successful synthesis of a heterojunction between the components of the nanocomposite was achieved. This exhibited an enormously improved electron-hole separation leading to an enhanced decontamination of the RR195 compared with those of the individual components of the prepared photocatalyst. Next the investigation of the influential reaction parameters suggested that, a complete degradation of the aforementioned contaminant could have been achieved in a solution of pH of 3.0 containing a photocatalyst dosage of 0.9 g/L after 70 min of duration under simulated sunlight illumination. Ultimately, a Z-scheme charge transfer mechanism for photodegradation of the RR195 over the TE-GCN@MgAl2O4 photocatalyst was proposed. Notably, this photocatalyst was highly stable and only a negligible reduction of about 6% in the photodegradation efficiency of it occurred after 5 consecutive catalytic reaction cycles. © 2022 Elsevier B.V
  6. Keywords:
  7. Azo-dyes ; Graphitic carbon nitride ; Heterojunction ; MgAl2O4 nanospheres ; Photocatalysis ; Aluminum compounds ; Carbon nitride ; Catalysis ; Charge transfer ; Degradation ; Heterojunctions ; Magnesium compounds ; Nanocomposites ; Nanosheets ; Nanospheres ; Combustion method ; Graphitic carbon nitrides ; Iso-electric points ; Mgal2O4 nanosphere ; Organic contaminant ; Photo degradation ; Physical characteristics ; Reactive red 195 ; Synthesised ; Azo dyes
  8. Source: Applied Surface Science ; Volume 585 , 2022 ; 01694332 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0169433222001982