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<p>This study investigated the effects of Cu doping on the structure, morphology, optical properties, and photocatalytic performance of SnO<sub>2</sub> nanoparticles (NPs) in the degradation of Rose Bengal (RB) using sunlight. SnO<sub>2</sub> and Cu-doped SnO<sub>2</sub> NPs with 1.5, 2.5, and 3.5 wt% Cu were synthesized by the Pechini-type sol–gel method. Thermal analysis was used to determine the calcination temperature for synthesizing the NPs. FT-IR analysis identified the Sn‒O bonds associated with the SnO<sub>2</sub> structure in all the samples. XRD analysis revealed that all the samples exhibited the tetragonal phase of SnO<sub>2</sub>. Morphological analysis revealed icosahedral particles with diameters of less than 25&#xa0;nm. The sample with 3.5 wt% Cu showed the best photocatalytic performance, degrading 96% of the RB in 120&#xa0;min and demonstrating good reusability over three cycles. Inhibitor experiments indicated that ·OH and ·O<sub>2</sub><sup>−</sup> radicals were the primary species responsible for decomposing RB.</p> Graphical abstract <p></p>

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Photocatalytic performance of SnO2 and Cu-doped SnO2 nanoparticles obtained by the Pechini-type sol–gel method

  • 期刊论文

  • 发表日期：

    2025年10月16日

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  • S. Gálvez-Barbosa,
  • J. Cisneros Preciado,
  • Luis A. Bretado,
  • Luis A. González

摘要

This study investigated the effects of Cu doping on the structure, morphology, optical properties, and photocatalytic performance of SnO2 nanoparticles (NPs) in the degradation of Rose Bengal (RB) using sunlight. SnO2 and Cu-doped SnO2 NPs with 1.5, 2.5, and 3.5 wt% Cu were synthesized by the Pechini-type sol–gel method. Thermal analysis was used to determine the calcination temperature for synthesizing the NPs. FT-IR analysis identified the Sn‒O bonds associated with the SnO2 structure in all the samples. XRD analysis revealed that all the samples exhibited the tetragonal phase of SnO2. Morphological analysis revealed icosahedral particles with diameters of less than 25 nm. The sample with 3.5 wt% Cu showed the best photocatalytic performance, degrading 96% of the RB in 120 min and demonstrating good reusability over three cycles. Inhibitor experiments indicated that ·OH and ·O2− radicals were the primary species responsible for decomposing RB.

Graphical abstract