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<p>Zinc oxide (ZnO) is a promising photocatalyst for the degradation of contaminants in effluents, such as the dye Tartrazine Yellow (TAR). Moreover, the use of UV-LEDs provides greater sustainability to the photocatalytic process, as their focused emission spectrum is designed to match the absorption band of the photocatalyst. This study aimed to evaluate the photocatalytic degradation of TAR using commercial ZnO in association with a UV-LED array and to optimize the physicochemical parameters of the process through experimental design. The influence of pH, ZnO dose, and TAR concentration on the reaction kinetics was investigated using the pseudo-first-order model to determine the rate constant (k). Subsequently, a Box-Behnken design was applied to optimize the combined effects of these variables on k. TAR photocatalytic degradation reactions were carried out using an array of 54 UV-LEDs (365 nm), ensuring a high photon utilization rate and low energy consumption. Under these conditions, ZnO photocatalysis achieved complete TAR photocatalytic degradation. The results indicated that the optimal conditions for maximizing the kinetic constant were pH 11.0, ZnO dose of 0.30 g L<sup>−1</sup>, and TAR concentration of 10 mg L<sup>−1</sup>, resulting in a rate constant of 23.64 × 10<sup>–2</sup> min<sup>−1</sup>. Therefore, the high efficiency achieved, combined with the development of a predictive model, demonstrated the potential of commercial ZnO photocatalysis for applications in the treatment of effluents from textile, pharmaceutical, and food industries containing TAR.</p> Graphical Abstract <p></p>

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Photocatalytic degradation of the industrial dye yellow tartrazine by commercial ZnO and UV-LED

  • 期刊论文

  • 发表日期：

    2025年12月23日

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  • João Gabriel Da Silva Andrade,
  • Carlos Eduardo Porto,
  • Débora Hungaro Micheletti,
  • Flávio Augusto Coutinho Biasuz,
  • Fernando Rodrigues De Carvalho,
  • Vagner Roberto Batistela,
  • Mara Heloisa Neves Olsen Scaliante

摘要

Zinc oxide (ZnO) is a promising photocatalyst for the degradation of contaminants in effluents, such as the dye Tartrazine Yellow (TAR). Moreover, the use of UV-LEDs provides greater sustainability to the photocatalytic process, as their focused emission spectrum is designed to match the absorption band of the photocatalyst. This study aimed to evaluate the photocatalytic degradation of TAR using commercial ZnO in association with a UV-LED array and to optimize the physicochemical parameters of the process through experimental design. The influence of pH, ZnO dose, and TAR concentration on the reaction kinetics was investigated using the pseudo-first-order model to determine the rate constant (k). Subsequently, a Box-Behnken design was applied to optimize the combined effects of these variables on k. TAR photocatalytic degradation reactions were carried out using an array of 54 UV-LEDs (365 nm), ensuring a high photon utilization rate and low energy consumption. Under these conditions, ZnO photocatalysis achieved complete TAR photocatalytic degradation. The results indicated that the optimal conditions for maximizing the kinetic constant were pH 11.0, ZnO dose of 0.30 g L−1, and TAR concentration of 10 mg L−1, resulting in a rate constant of 23.64 × 10–2 min−1. Therefore, the high efficiency achieved, combined with the development of a predictive model, demonstrated the potential of commercial ZnO photocatalysis for applications in the treatment of effluents from textile, pharmaceutical, and food industries containing TAR.

Graphical Abstract