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<p>The main goal of this study is the development of non-precious, highly effective, stable photocatalysts for the degradation of organic dyes. In this work, we utilize a strategy to regulate the surface and structure of catalysts to boost the photocatalytic activity and stability through A-site deficiency of La<sub>1-x</sub>CoO<sub>3</sub> perovskites. We fabricated a novel perovskite structure with a nominal composition of La<sub>1-x</sub>CoO<sub>3</sub> (x = 0 and 0.1) using a facile sol–gel method. Comprehensive characterization of the fabricated samples was performed using X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) analysis, and UV–Vis spectroscopy. XRD confirmed the formation of LaCoO<sub>3</sub> and La<sub>0.9</sub>CoO<sub>3</sub> at 750&#xa0;°C, both exhibiting a rhombohedral phase structure. FTIR analysis revealed characteristic bands at 585&#xa0;cm<sup>−1</sup> and 520&#xa0;cm<sup>−1</sup>, corresponding to the M–O–M reflection mode and M–O stretching vibrations, respectively. SEM micrographs showed pseudo-spherical grains with varying sizes and porosities for both samples. BET analysis further demonstrated specific surface areas of 9.58 m<sup>2</sup>/g for LaCoO<sub>3</sub> and 11.24 m<sup>2</sup>/g for La<sub>0.9</sub>CoO<sub>3</sub>. Optical and photocatalytic investigations indicated that the two materials possess semiconductor properties, with LaCoO<sub>3</sub> and La<sub>0.9</sub>CoO<sub>3</sub> exhibiting band gaps of 2.78&#xa0;eV and 2.64&#xa0;eV, respectively. Photocatalytic tests under visible light revealed significant degradation of the model dyes; LaCoO<sub>3</sub> achieved removal efficiencies of 56.41% for MB and 91.45% for NR, while La<sub>0.9</sub>CoO<sub>3</sub> demonstrated superior performance, reaching 80.07% degradation of MB and 98.16% of NR. These findings underscore the enhanced catalytic efficiency of La<sub>0.9</sub>CoO<sub>3</sub> compared to LaCoO<sub>3</sub>, making it a promising candidate for the photodegradation of organic pollutants under visible-light irradiation.</p>

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Sol–gel synthesis of LaCoO3 and La0.9CoO3 perovskites for photocatalytic degradation of methylene blue and neutral red dyes

  • 期刊论文

  • 发表日期：

    2025年8月11日

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  • Hanane Fodil,
  • Sofiane Makhloufi,
  • Salah Eddine Hachani,
  • Achouak Achour,
  • Adel Khiouani,
  • Nouria Bouchikhi,
  • Assia Karrab

摘要

The main goal of this study is the development of non-precious, highly effective, stable photocatalysts for the degradation of organic dyes. In this work, we utilize a strategy to regulate the surface and structure of catalysts to boost the photocatalytic activity and stability through A-site deficiency of La1-xCoO3 perovskites. We fabricated a novel perovskite structure with a nominal composition of La1-xCoO3 (x = 0 and 0.1) using a facile sol–gel method. Comprehensive characterization of the fabricated samples was performed using X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) analysis, and UV–Vis spectroscopy. XRD confirmed the formation of LaCoO3 and La0.9CoO3 at 750 °C, both exhibiting a rhombohedral phase structure. FTIR analysis revealed characteristic bands at 585 cm−1 and 520 cm−1, corresponding to the M–O–M reflection mode and M–O stretching vibrations, respectively. SEM micrographs showed pseudo-spherical grains with varying sizes and porosities for both samples. BET analysis further demonstrated specific surface areas of 9.58 m2/g for LaCoO3 and 11.24 m2/g for La0.9CoO3. Optical and photocatalytic investigations indicated that the two materials possess semiconductor properties, with LaCoO3 and La0.9CoO3 exhibiting band gaps of 2.78 eV and 2.64 eV, respectively. Photocatalytic tests under visible light revealed significant degradation of the model dyes; LaCoO3 achieved removal efficiencies of 56.41% for MB and 91.45% for NR, while La0.9CoO3 demonstrated superior performance, reaching 80.07% degradation of MB and 98.16% of NR. These findings underscore the enhanced catalytic efficiency of La0.9CoO3 compared to LaCoO3, making it a promising candidate for the photodegradation of organic pollutants under visible-light irradiation.