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<p>The advancement of effective catalytic materials is essential to meet the demand for organic molecules removal in wastewater purification. Herein, a well-defined hierarchical perovskite PbTiO<sub>3</sub> superstructure (Cu-n-H-PTO) was synthesized via a facile hydrothermal method with HF and Cu(NO<sub>3</sub>)<sub>2</sub>·xH<sub>2</sub>O as dual surfactants and applied as an activator of peroxydisulfate (PDS) toward RhB degradation. The microstructure investigation revealed that the dual surfactants played crucial roles in the formation of the hierarchical Cu-n-H-PTO superstructure, with F<sup>−</sup> ions adjusting the exposed facets and Cu<sup>2+</sup> ions improving the growth of the resultant facets. Remarkably, an effective activation of PDS based on the hierarchical Cu-n-H-PTO catalyst was constructed for RhB degradation. Under optimized conditions, up to 89.5% of RhB was removed within 42&#xa0;min by the Cu-n-H-PTO/PDS system under visible-light irradiation, 3.32 times higher than that of the pristine PTO microplate sample. The enhanced catalytic performance could be ascribed to the narrowed bandgap, improved separation of photo-generated carriers and elongated lifetime of the carriers. Further, the non-radical pathway dominated by singlet oxygen (<sup>1</sup>O<sub>2</sub>) and the free radical pathway involving superoxide species (O<sub>2</sub>·<sup>-</sup>) were confirmed to jointly boost the RhB degradation in PDS activation.</p>

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Surfactant-Assisted Hydrothermal Synthesis of Perovskite PbTiO3 Superstructure with Enhanced PDS Activation for Azo Dye Removal

  • 期刊论文

  • 发表日期：

    2026年4月21日

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  • Wanjun Liao,
  • Shuanglin Xie,
  • Mengdong Xia,
  • Yuanchun Li,
  • Simin Yin

摘要

The advancement of effective catalytic materials is essential to meet the demand for organic molecules removal in wastewater purification. Herein, a well-defined hierarchical perovskite PbTiO3 superstructure (Cu-n-H-PTO) was synthesized via a facile hydrothermal method with HF and Cu(NO3)2·xH2O as dual surfactants and applied as an activator of peroxydisulfate (PDS) toward RhB degradation. The microstructure investigation revealed that the dual surfactants played crucial roles in the formation of the hierarchical Cu-n-H-PTO superstructure, with F− ions adjusting the exposed facets and Cu2+ ions improving the growth of the resultant facets. Remarkably, an effective activation of PDS based on the hierarchical Cu-n-H-PTO catalyst was constructed for RhB degradation. Under optimized conditions, up to 89.5% of RhB was removed within 42 min by the Cu-n-H-PTO/PDS system under visible-light irradiation, 3.32 times higher than that of the pristine PTO microplate sample. The enhanced catalytic performance could be ascribed to the narrowed bandgap, improved separation of photo-generated carriers and elongated lifetime of the carriers. Further, the non-radical pathway dominated by singlet oxygen (1O2) and the free radical pathway involving superoxide species (O2·-) were confirmed to jointly boost the RhB degradation in PDS activation.