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<p>Fe<sub>2</sub>O<sub>3</sub>-TiO<sub>2</sub> heterojunctions have emerged as promising photocatalysts because their multiphase composition combines visible-light absorption, charge separation, and structural stability. In this work, the effects of thermally induced phase evolution and Rh incorporation on Fe<sub>2</sub>O<sub>3</sub>-TiO<sub>2</sub> heterojunctions were evaluated under UV and simulated solar irradiation. Variations in the relative proportions of anatase, maghemite, and hematite modified the optical response of the materials. Tauc analysis revealed indirect bandgaps between 1.8 and 1.9&#xa0;eV and direct bandgaps between 2.4 and 2.5&#xa0;eV, while derivative peak fitting identified electronic transitions at 1.7–2.1&#xa0;eV. Rh incorporation generated an additional low-energy transition at 1.6&#xa0;eV and preserved the heterojunction architecture. Photocatalytic performance strongly depended on the irradiation regime. Under UV irradiation, activity correlated primarily with phase composition, particularly with anatase-related descriptors. Under simulated solar irradiation, activity was more closely associated with phase evolution and DPR-derived electronic transitions than with Tauc-derived bandgap energies. Rh incorporation produced the highest simulated solar irradiation activity (<i>k</i><sub>Vis</sub> = 0.300 ± 0.060&#xa0;h<sup>− 1</sup>), but the lowest UV activity (<i>k</i><sub>UV</sub> = 0.074 ± 0.003&#xa0;h<sup>− 1</sup>). These results indicate that phase evolution plays a dominant role in governing the photoresponse of Fe<sub>2</sub>O<sub>3</sub>-TiO<sub>2</sub> heterojunctions, while Rh primarily modifies simulated solar irradiation activity through additional electronic transitions.</p>

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Structure-activity relationships in noble metal-modified heterojunctions: Synergistic effects in the photocatalytic oxidation of phenol

  • 期刊论文

  • 发表日期：

    2026年7月8日

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  • Adriana G. Jiménez-Vázquez,
  • Jorge Santiago Ferráez-Hernández,
  • Ignacio Cuauhtémoc-López,
  • Luis A. Estudillo-Wong,
  • Juan Manuel Magaña-Piña,
  • Carlos Mario Morales-Bautista,
  • Juan Carlos Arévalo-Pérez

摘要

Fe2O3-TiO2 heterojunctions have emerged as promising photocatalysts because their multiphase composition combines visible-light absorption, charge separation, and structural stability. In this work, the effects of thermally induced phase evolution and Rh incorporation on Fe2O3-TiO2 heterojunctions were evaluated under UV and simulated solar irradiation. Variations in the relative proportions of anatase, maghemite, and hematite modified the optical response of the materials. Tauc analysis revealed indirect bandgaps between 1.8 and 1.9 eV and direct bandgaps between 2.4 and 2.5 eV, while derivative peak fitting identified electronic transitions at 1.7–2.1 eV. Rh incorporation generated an additional low-energy transition at 1.6 eV and preserved the heterojunction architecture. Photocatalytic performance strongly depended on the irradiation regime. Under UV irradiation, activity correlated primarily with phase composition, particularly with anatase-related descriptors. Under simulated solar irradiation, activity was more closely associated with phase evolution and DPR-derived electronic transitions than with Tauc-derived bandgap energies. Rh incorporation produced the highest simulated solar irradiation activity (kVis = 0.300 ± 0.060 h− 1), but the lowest UV activity (kUV = 0.074 ± 0.003 h− 1). These results indicate that phase evolution plays a dominant role in governing the photoresponse of Fe2O3-TiO2 heterojunctions, while Rh primarily modifies simulated solar irradiation activity through additional electronic transitions.