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Heterogeneous photocatalytic degradation of organic pollutant in aqueous solutions by S-scheme heterojunction in nickel molybdate nanocomposites

Salari, H ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jece.2021.105903
  3. Publisher: Elsevier Ltd , 2021
  4. Abstract:
  5. A novel ɑ-NiMoO4/ɑ-MoO3 binary nanocomposite was fabricated by using facile method. The fabricated nanocomposite was characterized by various techniques, and the photocatalytic activity was evaluated in degradation of Acid blue 92 dye. Among of as-made photocatalysts with various weight ratios of ɑ-MoO3, ɑ-NiMoO4/ɑ-MoO3 (1:5%w/w) exhibited the best photocatalytic performance, and selected as optimum photocatalyst. Under optimum reaction conditions ([dye] = 10 mg L−1, [catalyst] = 200 mg L−1, and pH = 7.0), complete removal efficiency was obtained within 100 min. Also, the first-order rate constant value of reaction in the presence of ɑ-NiMoO4/ɑ-MoO3 was calculated to be 0.032 min−1 that was 3.05, and 2.13 times higher than ɑ-NiMoO4 and ɑ-MoO3, respectively. The improvement photocatalytic performance of ɑ-NiMoO4/ɑ-MoO3 is depended to efficient separation of charge carries, which confirmed by EIS, and PC analysis. According to the radical trapping experiments, hydroxyl radical (HO•), and photo-generated holes (h+) were the dominant reactive species in this reaction. In addition, the recycling experiments indicated that, ɑ-NiMoO4/ɑ-MoO3 nanocomposite has remarkable stability without losing the activity after four consecutive photocatalytic runs. The present study reports a new method for the synthesis of Mo-based nanocomposite for the environmental applications. © 2021 Elsevier Ltd
  6. Keywords:
  7. Heterojunctions ; Molybdenum oxide ; Nickel ; Organic pollutants ; Photocatalytic activity ; Rate constants ; Facile method ; Hetero-junction structure ; Hydroxyl radicals ; Mo-based semiconductor ; MoO$-3$ ; Nickel molybdate ; Organics ; Photo catalytic degradation ; Photocatalytic performance ; Visible-light photocatalysts ; Nanocomposites
  8. Source: Journal of Environmental Chemical Engineering ; Volume 9, Issue 5 , 2021 ; 22133437 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S2213343721008800