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<p>Semiconductor photocatalysis holds significant promise for addressing dye-pollution in water. However, the efficiency of photocatalytic water purification is constrained by the weak light absorption capacity and low active site distribution of photocatalysts. Utilizing a bottom-up approach, carbon-doped TiO<sub><i>x</i></sub> (C-TiO<sub><i>x</i></sub>) nanosheets with high concentrations of Ti<sup>3+</sup> active sites were fabricated by etching the Al element in Ti<sub>3</sub>AiC<sub>2</sub> with H<sub>2</sub>O<sub>2</sub>. Experimental evidence demonstrates that the optimal C-TiO<sub><i>x</i></sub> nanosheets exhibit high activity for the photocatalytic degradation of methylene blue, achieving a degradation rate of 100% within 50 min. The introduction of carbon into the C-TiO<sub><i>x</i></sub> nanosheets induces a red shift in the absorption edge, boosting the migration of photo-generated charge carriers. Moreover, there is a significant correlation between the concentration of Ti<sup>3+</sup> active sites and the density of oxygen vacancies in the C-TiO<sub><i>x</i></sub> nanosheets, which synergistically influence the photocatalytic degradation performance of MB dye wastewater.</p>

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High concentration of Ti3+ in C-TiOx nanosheets boosting efficient photodegradation

  • 期刊论文

  • 发表日期：

    2025年2月12日

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  • Chongbei Wu,
  • Xuan Li,
  • Haibin Wang,
  • Jiaxin Tang,
  • Shuai Wei,
  • Yuanyuan Wu,
  • Aobing Wang,
  • Jizhou Jiang

摘要

Semiconductor photocatalysis holds significant promise for addressing dye-pollution in water. However, the efficiency of photocatalytic water purification is constrained by the weak light absorption capacity and low active site distribution of photocatalysts. Utilizing a bottom-up approach, carbon-doped TiOx (C-TiOx) nanosheets with high concentrations of Ti3+ active sites were fabricated by etching the Al element in Ti3AiC2 with H2O2. Experimental evidence demonstrates that the optimal C-TiOx nanosheets exhibit high activity for the photocatalytic degradation of methylene blue, achieving a degradation rate of 100% within 50 min. The introduction of carbon into the C-TiOx nanosheets induces a red shift in the absorption edge, boosting the migration of photo-generated charge carriers. Moreover, there is a significant correlation between the concentration of Ti3+ active sites and the density of oxygen vacancies in the C-TiOx nanosheets, which synergistically influence the photocatalytic degradation performance of MB dye wastewater.