The photosensitization and photocatalytic activity of the n-ZnO/p-CuAl2O4 hetero-system for degradation of two dyes under visible light

Abstract The synthesis of p-CuAl2O4 via the nitrate route and its photocatalytic performance in conjunction with n-ZnO were investigated. The spinel underwent characterization through thermal analysis (TG), X-ray diffraction (XRD), SEM/EDX microscopy, FTIR-ATR, BET analysis, and diffuse reflectance (DRS). Various operating parameters, such as the amount of the sensitizer CuAl2O4, pH, catalyst dose, and initial concentration (Co) of Direct Blue 86 (DB86) and Methylene Blue (MB) were optimized for the hetero-system p-CuAl2O4/n-ZnO. Optimization was carried out for the photocatalytic oxidation under visible light, and the apparent rate constant (kapp) of MB was found to be higher than that of DB86. The contribution of each species generated for the degradation of DB86 followed the sequence: e− > •OH > h+ > O2•−, while for the degradation of MB, •OH was identified as the key species, although the action of e− and h+ also played a significant role.

• Publication year

  2025

• Venue

  Chemical Engineering Communications

• Publication date

  2025-01-06

• Fields of study

  Not labeled

• Identifiers
  DOI 10.1080/00986445.2024.2446542
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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