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<p>In this work, a CoTiO<sub>3</sub>/ZnO heterojunction of the direct <i>Z</i> type, which has not been previously studied in the literature, was synthesized using the microwave-assisted hydrothermal method. There was no formation of secondary phases or remnants of precursors, as indicated by XRD and Raman analysis. There was morphological control with the increase in weight% of CoTiO<sub>3</sub> (CTO), with ZnO stick morphology prevailing during precipitation. The synergism between piezocatalysis and photocatalysis was studied, evaluating the simultaneous use of both radiation sources during the degradation process of the dye Rhodamine B (RhB), which achieved an efficiency of 95.73% within 80&#xa0;min using the CZ1 heterostructure. Tests on the dosage of the piezophotocatalyst, the presence of inorganic ions, and the pH of the solution were conducted to determine the optimal conditions for application. The reuse and stability of the CZ1 heterostructure were evaluated against RhB during six reuse cycles, showing that it was a stable material after the cycles and maintained its efficiency. The radicals active in the degradation process were determined, with ·OH and ·O<sub>2</sub><sup>−</sup> being the most active radical. Despite this, the degradation mechanism and the type of heterojunction formed were proposed to be of the direct <i>Z</i> type.</p>

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Piezophotocatalytic synergistic effect in CoTiO3/ZnO heterostructures: a multifunctional approach for energy conversion

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • Ronier A. Oliveira,
  • Lays M. Costa,
  • Marcio D. Teodoro,
  • Marcio A. Correa,
  • Mauricio R. D. Bomio,
  • Fabiana V. Motta

摘要

In this work, a CoTiO3/ZnO heterojunction of the direct Z type, which has not been previously studied in the literature, was synthesized using the microwave-assisted hydrothermal method. There was no formation of secondary phases or remnants of precursors, as indicated by XRD and Raman analysis. There was morphological control with the increase in weight% of CoTiO3 (CTO), with ZnO stick morphology prevailing during precipitation. The synergism between piezocatalysis and photocatalysis was studied, evaluating the simultaneous use of both radiation sources during the degradation process of the dye Rhodamine B (RhB), which achieved an efficiency of 95.73% within 80 min using the CZ1 heterostructure. Tests on the dosage of the piezophotocatalyst, the presence of inorganic ions, and the pH of the solution were conducted to determine the optimal conditions for application. The reuse and stability of the CZ1 heterostructure were evaluated against RhB during six reuse cycles, showing that it was a stable material after the cycles and maintained its efficiency. The radicals active in the degradation process were determined, with ·OH and ·O2− being the most active radical. Despite this, the degradation mechanism and the type of heterojunction formed were proposed to be of the direct Z type.