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<p>Photocatalysis is an effective approach to addressing the global energy shortage and environmental pollution problems. TiO<sub>2</sub> is widely used as a catalyst, while its wide band gap leads to a small light response range and low quantum efficiency, which hinders its commercial development. To effectively improve this, the paper modifies the TiO<sub>2</sub> nanocrystals exposed on specific crystal planes by introducing surface defects and loading metal Au. Using the photocatalytic degradation of rhodamine B and phenol as probe reactions, the regulatory effects of exposed crystal planes, metal loading, and defect concentration on photocatalytic performance were revealed. TiO<sub>2</sub> nanocrystals with (001) crystal plane exposure were synthesized by the hydrothermal method. Visible light catalysts of xAu/TiO<sub>2</sub> nanocrystals with different concentrations of oxygen defects and Au loading were successfully prepared by the urea deposition–precipitation method combined with calcination reduction, and their characterization was carried out by means of characterization techniques. The Au/TiO<sub>2</sub> nanocrystals exhibit the best photocatalytic activity. The efficiency of degrading rhodamine B and phenol under visible light reaches 97.7 and 96.6%, respectively, and their degradation rates are 6.2 and 12.1 times that of pure TiO<sub>2</sub>. The mechanism analysis indicates that the high photocatalytic activity is mainly attributed to the synergistic effect among the exposure of the (001) crystal plane, the formation of Ti<sup>3+</sup> and oxygen vacancies, as well as Au loading. Meanwhile, the 1Au/TiO<sub>2</sub> nanocrystals exhibit excellent stability and demonstrate certain potential for practical applications.</p>

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Defect and Au synergistically modulating the photocatalytic performance of (001)-TiO2: active species identification and pollutant degradation mechanisms

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • Tianxiang Hu,
  • Feng Shi,
  • Jianxing Liang,
  • Nianchen Zhang,
  • Jinguo Wang

摘要

Photocatalysis is an effective approach to addressing the global energy shortage and environmental pollution problems. TiO2 is widely used as a catalyst, while its wide band gap leads to a small light response range and low quantum efficiency, which hinders its commercial development. To effectively improve this, the paper modifies the TiO2 nanocrystals exposed on specific crystal planes by introducing surface defects and loading metal Au. Using the photocatalytic degradation of rhodamine B and phenol as probe reactions, the regulatory effects of exposed crystal planes, metal loading, and defect concentration on photocatalytic performance were revealed. TiO2 nanocrystals with (001) crystal plane exposure were synthesized by the hydrothermal method. Visible light catalysts of xAu/TiO2 nanocrystals with different concentrations of oxygen defects and Au loading were successfully prepared by the urea deposition–precipitation method combined with calcination reduction, and their characterization was carried out by means of characterization techniques. The Au/TiO2 nanocrystals exhibit the best photocatalytic activity. The efficiency of degrading rhodamine B and phenol under visible light reaches 97.7 and 96.6%, respectively, and their degradation rates are 6.2 and 12.1 times that of pure TiO2. The mechanism analysis indicates that the high photocatalytic activity is mainly attributed to the synergistic effect among the exposure of the (001) crystal plane, the formation of Ti3+ and oxygen vacancies, as well as Au loading. Meanwhile, the 1Au/TiO2 nanocrystals exhibit excellent stability and demonstrate certain potential for practical applications.