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<p>In this work, Gd<sub>2</sub>CuO<sub>4</sub>, prepared by the nitrate method, exhibited a significant piezo-photocatalytic activity for the degradation of Rhodamine B (Rh B) under solar illumination. Structural and electrochemical analyses confirmed the formation of a tetragonal spinel phase with <i>p</i>-type semiconducting behavior and a narrow band gap of 1.37&#xa0;eV, enabling efficient visible-light absorption. Additionally, the material demonstrated an excellent chemical stability over a wide pH range, along with favorable electrochemical characteristics, supporting its potentiality for Advanced Oxidation Processes (AOPs). Under photocatalysis alone, Gd<sub>2</sub>CuO<sub>4</sub> achieved 63% Rh B degradation via superoxide radicals (O<sub>2</sub><sup>⋅−</sup>). However, the introduction of piezo-photocatalysis (PPC) using Ultrasound Waves (USW, 60&#xa0;kHz) significantly enhanced the oxidation efficiency to 90% within only 35&#xa0;min., following a pseudo-first-order kinetic model with a half-life of 17&#xa0;min. This enhancement is attributed to the material’s piezoelectric and ferroelectric properties, which promote the charge separation and accelerate Reactive Oxygen Species (ROS) generation. Additionally, the narrow band gap and negative conduction band improve solar energy utilization and facilitate oxygen reduction to reactive intermediates. Gd<sub>2</sub>CuO<sub>4</sub> is found to be a highly efficient piezo-photocatalyst, with the synergy of piezoelectricity and photocatalysis enabling sustainable wastewater treatment.</p>

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Solar-Driven Piezo-Photocatalysis Over Gd2CuO4: In situ H2O2 Generation for Efficient Pollutant Mineralization

  • 期刊论文

  • 发表日期：

    2026年1月31日

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  • Abdelaziz Sahmi,
  • Hicham Lahmar,
  • Messaoud Benamira,
  • Mohamed Trari

摘要

In this work, Gd2CuO4, prepared by the nitrate method, exhibited a significant piezo-photocatalytic activity for the degradation of Rhodamine B (Rh B) under solar illumination. Structural and electrochemical analyses confirmed the formation of a tetragonal spinel phase with p-type semiconducting behavior and a narrow band gap of 1.37 eV, enabling efficient visible-light absorption. Additionally, the material demonstrated an excellent chemical stability over a wide pH range, along with favorable electrochemical characteristics, supporting its potentiality for Advanced Oxidation Processes (AOPs). Under photocatalysis alone, Gd2CuO4 achieved 63% Rh B degradation via superoxide radicals (O2⋅−). However, the introduction of piezo-photocatalysis (PPC) using Ultrasound Waves (USW, 60 kHz) significantly enhanced the oxidation efficiency to 90% within only 35 min., following a pseudo-first-order kinetic model with a half-life of 17 min. This enhancement is attributed to the material’s piezoelectric and ferroelectric properties, which promote the charge separation and accelerate Reactive Oxygen Species (ROS) generation. Additionally, the narrow band gap and negative conduction band improve solar energy utilization and facilitate oxygen reduction to reactive intermediates. Gd2CuO4 is found to be a highly efficient piezo-photocatalyst, with the synergy of piezoelectricity and photocatalysis enabling sustainable wastewater treatment.