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<p>The efficient removal of organic pollutants under sunlight is a significant challenge in the environmental remediation. This study explores the potential of the delafossite CuFeO<sub>2</sub> as a piezo-photo-electrocatalyst for the oxidation of Rhodamine B (Rh B). CuFeO<sub>2</sub> was synthesized by sol–gel method, which enhanced its surface-to-volume ratio. Characterization by XRD, SEM, FTIR, XPS analysis and UV–Vis spectroscopy revealed its non-porous morphology, presence of Cu–O and Fe–O bonds, and a direct gap of 1.40&#xa0;eV, attributed to the Fe<sup>3</sup>⁺ (t<sub>2g</sub> → e<sub>g</sub>) transition within FeO<sub>6</sub> octahedra. The material exhibits <Emphasis Type="BoldItalic">p</Emphasis>-type conductivity, and its conduction band (–0.86&#xa0;V) was capable of reducing O<sub>2</sub> to superoxide (O<sub>2</sub><sup>•−</sup>). Under sunlight and an applied current of 150&#xa0;mA, CuFeO<sub>2</sub> achieved 66% Rh B degradation (20&#xa0;mg L<sup>−1</sup>) via electrocatalysis driven by O<sub>2</sub><sup>•−</sup> radicals. This performance was further enhanced up to 92% degradation within 70&#xa0;min. by integrating ultrasound waves (60&#xa0;kHz) in a sono-photo-electrocatalytic (SPE) process. The degradation kinetic follows a pseudo-first-order model with a half-life of 35&#xa0;min. A reaction mechanism is proposed based on electrochemical principles, emphasizing the piezo-/ferroelectric response of CuFeO<sub>2</sub>. These findings offer valuable insights for designing efficient piezo-/ferroelectric nanostructures for solar energy-driven environmental applications.</p>

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Advancements in sono-photo-electrocatalytic oxidation for the removal of toxic contaminants in wastewaters

  • 期刊论文

  • 发表日期：

    2025年12月10日

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  • A. Sahmi,
  • G. Berkani,
  • Hicham Lahmar,
  • M. Benamira,
  • H. Aksas,
  • M. Trari

摘要

The efficient removal of organic pollutants under sunlight is a significant challenge in the environmental remediation. This study explores the potential of the delafossite CuFeO2 as a piezo-photo-electrocatalyst for the oxidation of Rhodamine B (Rh B). CuFeO2 was synthesized by sol–gel method, which enhanced its surface-to-volume ratio. Characterization by XRD, SEM, FTIR, XPS analysis and UV–Vis spectroscopy revealed its non-porous morphology, presence of Cu–O and Fe–O bonds, and a direct gap of 1.40 eV, attributed to the Fe3⁺ (t2g → eg) transition within FeO6 octahedra. The material exhibits p-type conductivity, and its conduction band (–0.86 V) was capable of reducing O2 to superoxide (O2•−). Under sunlight and an applied current of 150 mA, CuFeO2 achieved 66% Rh B degradation (20 mg L−1) via electrocatalysis driven by O2•− radicals. This performance was further enhanced up to 92% degradation within 70 min. by integrating ultrasound waves (60 kHz) in a sono-photo-electrocatalytic (SPE) process. The degradation kinetic follows a pseudo-first-order model with a half-life of 35 min. A reaction mechanism is proposed based on electrochemical principles, emphasizing the piezo-/ferroelectric response of CuFeO2. These findings offer valuable insights for designing efficient piezo-/ferroelectric nanostructures for solar energy-driven environmental applications.