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<p>Nanomaterials based on metal oxides are promising catalysts for photocatalytic water purification. To increase the efficiency of water purification, modifying additives are introduced into the nanomaterials as well as the synthesis conditions are varied. In this work the photocatalytic activity of pristine TiO<sub>2</sub> and La-doped TiO<sub>2</sub> nanomaterials have been investigated for the methylene blue dye degradation. La-doped TiO<sub>2</sub> nanoparticles were obtained by a simple chemical method in solution. The influence of synthesis conditions and La<sup>3+</sup> content (0.5–5&#xa0;mol.%) on characteristics and photocatalytic activity were investigated. X-ray diffraction, scanning electron microscopy and transmission electron microscopy have confirmed that all synthesized materials exhibit a pure anatase phase, with particle sizes ranging from 9 to 15&#xa0;nm, as the calcination temperature and the La<sup>3+</sup> concentration increase. UV–visible absorption spectroscopy data showed that La-doped TiO<sub>2</sub> photocatalysts has a red-shifted absorption edge towards longer wavelengths, which improves the overall light harvesting and photocatalytic activity. TiO<sub>2</sub> nanoparticles doped with 2% La<sup>3+</sup> demonstrate excellent photocatalytic characteristics, decomposing 96% of the methylene blue dye in 60&#xa0;min under visible light irradiation and maintaining an efficiency of more than 86% over four reuse cycles. This makes it suitable for practical use as a photocatalyst for wastewater treatment from organic dyes under the sunlight influence.</p>

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Synthesis of La-doped TiO2 nanoparticles with enhanced photocatalytic activity

  • 期刊论文

  • 发表日期：

    2025年2月18日

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  • Ekaterina Bayan,
  • Maria Volkova,
  • Mikhail Tolstunov,
  • Anatoly Chernyshev

摘要

Nanomaterials based on metal oxides are promising catalysts for photocatalytic water purification. To increase the efficiency of water purification, modifying additives are introduced into the nanomaterials as well as the synthesis conditions are varied. In this work the photocatalytic activity of pristine TiO2 and La-doped TiO2 nanomaterials have been investigated for the methylene blue dye degradation. La-doped TiO2 nanoparticles were obtained by a simple chemical method in solution. The influence of synthesis conditions and La3+ content (0.5–5 mol.%) on characteristics and photocatalytic activity were investigated. X-ray diffraction, scanning electron microscopy and transmission electron microscopy have confirmed that all synthesized materials exhibit a pure anatase phase, with particle sizes ranging from 9 to 15 nm, as the calcination temperature and the La3+ concentration increase. UV–visible absorption spectroscopy data showed that La-doped TiO2 photocatalysts has a red-shifted absorption edge towards longer wavelengths, which improves the overall light harvesting and photocatalytic activity. TiO2 nanoparticles doped with 2% La3+ demonstrate excellent photocatalytic characteristics, decomposing 96% of the methylene blue dye in 60 min under visible light irradiation and maintaining an efficiency of more than 86% over four reuse cycles. This makes it suitable for practical use as a photocatalyst for wastewater treatment from organic dyes under the sunlight influence.