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<p>A series of novel cube-shaped Ce-doped bimetallic NaTaO<sub>3</sub> (CNTO) photocatalysts (3, 5, and 7 wt%, denoted as CNTO-x%) are prepared following a hydrothermal route. Based on the photocatalytic performance of doped samples, a composite heterostructure integrating CNTO-7% with reduced graphene oxide is also prepared by ultrasonication. As prepared materials are characterized by XRD, FT-IR, TGA, SEM/EDX, and UV-Vis spectroscopy. Electrochemical measurements, including EIS, Mott-Schottky, and photocurrent analysis, are performed to study the charge generation, separation, and transport properties of photocatalysts. XRD analysis of materials indicated a monoclinic phase of NTO and a notable decrease in the size of crystallite size from 8.7&#xa0;nm to 6.34&#xa0;nm, upon Ce doping and rGO integration. SEM characterizations showed well-incorporation of CNTO-x% phase with rGO nanosheets. Optical studies reveal a red shift in the absorption edge of NTO with Ce-doping and increased doping concentration, reflecting an increase in the visible light absorption ability. The effect further improved for G/CNTO-7% due to the superior light harvesting properties of rGO. Electrochemical analysis exhibits a decline in the flat band potential (E<sub>fb</sub>), from 2.90&#xa0;V for pristine NTO to 2.35&#xa0;V and 1.56&#xa0;V for CNTO-7% and G/CNTO-7%. Consistently, an increase in photocurrent density is observed with the maximum current density of ~ 5.5 µA/cm² for G/CNTO-7%, compared to 1.5 µA/cm² for pristine NTO. Photocatalytic experiments show 97.7% and 89.8% photo-degradation of bromocresol blue and acetaminophen under visible light irradiations. This enhanced photocatalytic performance of G/CNTO-7% is attributed to the synergistic effects of Ce-doping and rGO modification. These enhancements position G/CNTO-7% as a promising photocatalyst for solar-driven environmental remediation applications.</p>

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Hybrid Perovskite-Graphene Systems as a Revolutionary Platform for Visible-Light Photocatalysis and Solar-Driven Organic Pollutant Degradation

  • 期刊论文

  • 发表日期：

    2026年1月21日

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  • Muhammad Shahid,
  • Saad Aljaber,
  • Mokhtar Hjiri,
  • Mohamed Abdel Rafea,
  • Mohamed R. El-Aassar,
  • Imran Shakir,
  • Abdullah K. Alanazi,
  • Khadija Chaudhary,
  • Muhammad Aadil

摘要

A series of novel cube-shaped Ce-doped bimetallic NaTaO3 (CNTO) photocatalysts (3, 5, and 7 wt%, denoted as CNTO-x%) are prepared following a hydrothermal route. Based on the photocatalytic performance of doped samples, a composite heterostructure integrating CNTO-7% with reduced graphene oxide is also prepared by ultrasonication. As prepared materials are characterized by XRD, FT-IR, TGA, SEM/EDX, and UV-Vis spectroscopy. Electrochemical measurements, including EIS, Mott-Schottky, and photocurrent analysis, are performed to study the charge generation, separation, and transport properties of photocatalysts. XRD analysis of materials indicated a monoclinic phase of NTO and a notable decrease in the size of crystallite size from 8.7 nm to 6.34 nm, upon Ce doping and rGO integration. SEM characterizations showed well-incorporation of CNTO-x% phase with rGO nanosheets. Optical studies reveal a red shift in the absorption edge of NTO with Ce-doping and increased doping concentration, reflecting an increase in the visible light absorption ability. The effect further improved for G/CNTO-7% due to the superior light harvesting properties of rGO. Electrochemical analysis exhibits a decline in the flat band potential (Efb), from 2.90 V for pristine NTO to 2.35 V and 1.56 V for CNTO-7% and G/CNTO-7%. Consistently, an increase in photocurrent density is observed with the maximum current density of ~ 5.5 µA/cm² for G/CNTO-7%, compared to 1.5 µA/cm² for pristine NTO. Photocatalytic experiments show 97.7% and 89.8% photo-degradation of bromocresol blue and acetaminophen under visible light irradiations. This enhanced photocatalytic performance of G/CNTO-7% is attributed to the synergistic effects of Ce-doping and rGO modification. These enhancements position G/CNTO-7% as a promising photocatalyst for solar-driven environmental remediation applications.