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<p>With the increasing problems caused by water pollution, the use of photocatalytic oxidation to remove pollutants from wastewater is a sustainable strategy. However, it is challenging to develop well-designed photocatalysts with high photo-quantum efficiency and the comprehension of their photocatalytic reaction mechanisms. Herein, a R/A-TiO<sub>2</sub>/Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> (R: rutile; A: anatase) photocatalyst with different ratios of rutile and anatase phases was prepared by a facile hydrothermal method. The results showed that the number of rutile and anatase phases could be readily regulated by adjusting the dosage of titanium isopropoxide (TTIP) and Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>. The prepared R/A-TiO<sub>2</sub>/Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>-0.2 contained a mass fraction of 42% rutile phase and 58% anatase phase, with the interface between the two phases exhibited a tightly bonded structure. Meanwhile, the heterojunction between the heterophase TiO<sub>2</sub> and Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> interfaces improved the photo-quantum efficiency of R/A-TiO<sub>2</sub>/Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>, and the degradation efficiency of Rhodamine B (RhB) by R/A-TiO<sub>2</sub>/Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>-0.2 was 77.82% in 2&#xa0;h under ultraviolet light illumination. Ultimately, the active species capture experiments verified that the primary active species in the photocatalytic reaction was h<sup>+</sup>, ·OH, and·O<sub>2</sub><sup>−</sup>. This work could shed light on the new approach to the rational design of high-efficiency heterophase TiO<sub>2</sub>-based photocatalysts.</p> Graphical Abstract <p>R/A-TiO<sub>2</sub>/Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> photocatalysts with heterojunctions were controllably synthesized by an EDTA-2Na-assisted hydrothermal method.</p> <p></p>

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Enhancement the Photo-Quantum Efficiency in Photocatalytic Reactions via Well-Designed Rutile/Anatase TiO2 Growth on 2D Ti3C2Tx

  • 期刊论文

  • 发表日期：

    2025年1月17日

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  • Wei Gan,
  • Yan Guo,
  • Dan Zhu,
  • Min Ling,
  • Can Jiang,
  • Shengfu Zhang

摘要

With the increasing problems caused by water pollution, the use of photocatalytic oxidation to remove pollutants from wastewater is a sustainable strategy. However, it is challenging to develop well-designed photocatalysts with high photo-quantum efficiency and the comprehension of their photocatalytic reaction mechanisms. Herein, a R/A-TiO2/Ti3C2Tx (R: rutile; A: anatase) photocatalyst with different ratios of rutile and anatase phases was prepared by a facile hydrothermal method. The results showed that the number of rutile and anatase phases could be readily regulated by adjusting the dosage of titanium isopropoxide (TTIP) and Ti3C2Tx. The prepared R/A-TiO2/Ti3C2Tx-0.2 contained a mass fraction of 42% rutile phase and 58% anatase phase, with the interface between the two phases exhibited a tightly bonded structure. Meanwhile, the heterojunction between the heterophase TiO2 and Ti3C2Tx interfaces improved the photo-quantum efficiency of R/A-TiO2/Ti3C2Tx, and the degradation efficiency of Rhodamine B (RhB) by R/A-TiO2/Ti3C2Tx-0.2 was 77.82% in 2 h under ultraviolet light illumination. Ultimately, the active species capture experiments verified that the primary active species in the photocatalytic reaction was h+, ·OH, and·O2−. This work could shed light on the new approach to the rational design of high-efficiency heterophase TiO2-based photocatalysts.

Graphical Abstract

R/A-TiO2/Ti3C2Tx photocatalysts with heterojunctions were controllably synthesized by an EDTA-2Na-assisted hydrothermal method.