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<p>Photocatalysts like TiO<sub>2</sub> can harness sunlight to reduce CO<sub>2</sub> into valuable hydrocarbon fuels, representing a promising solution for carbon neutrality and sustainable energy challenges. Herein, the effect of hydrothermal modification on the CO<sub>2</sub> photothermal reduction activity of TiO<sub>2</sub> catalyst was studied, through photo-catalytic performance test, XRD, Raman, N<sub>2</sub> adsorption, SEM, TEM, CO<sub>2</sub>-TPD, UV-vis DRS, and PL on commercial and modified TiO<sub>2</sub>. The results show that the hydrothermal-modified TiO<sub>2</sub>-NBS is a pure anatase phase, which has a narrower band gap than the mixed anatase and rutile structure of commercial TiO<sub>2</sub>-P25, and is more favorable to the excitation of photon-generated carriers. Meanwhile, the light emission intensity of anatase phase is weaker, which is conducive to electron-hole separation, promoting the reactant intermediate conversion. In addition, compared with TiO<sub>2</sub>-P25, TiO<sub>2</sub>-NBS has better morphology and specific surface pore characteristics, more adsorption sites for CO<sub>2</sub>, and stronger adsorption strength, which facilitate the adsorption and activation reactions of CO<sub>2</sub>. As a result, TiO<sub>2</sub>-NBS exhibits stronger CO<sub>2</sub> photothermal reduction activity, with CO and CH<sub>4</sub> production rates of 6.49 µmol g<sup>−1</sup> h<sup>−1</sup>&#xa0;and 1.56 µmol g<sup>−1</sup> h<sup>−1</sup>, which are 2.58 times and 2.84 times those of TiO<sub>2</sub>-P25, respectively.</p> Graphical Abstract <p></p>

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Study on the Effect and Mechanism of Hydrothermal Modification on TiO2 Catalysts for CO2 Photo-Thermal Reduction

  • 期刊论文

  • 发表日期：

    2025年1月3日

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  • Bin Guan,
  • Junyan Chen,
  • Zhongqi Zhuang,
  • Lei Zhu,
  • Zeren Ma,
  • Xuehan Hu,
  • Chenyu Zhu,
  • Sikai Zhao,
  • Kaiyou Shu,
  • Hongtao Dang,
  • Tiankui Zhu,
  • Zhen Huang

摘要

Photocatalysts like TiO2 can harness sunlight to reduce CO2 into valuable hydrocarbon fuels, representing a promising solution for carbon neutrality and sustainable energy challenges. Herein, the effect of hydrothermal modification on the CO2 photothermal reduction activity of TiO2 catalyst was studied, through photo-catalytic performance test, XRD, Raman, N2 adsorption, SEM, TEM, CO2-TPD, UV-vis DRS, and PL on commercial and modified TiO2. The results show that the hydrothermal-modified TiO2-NBS is a pure anatase phase, which has a narrower band gap than the mixed anatase and rutile structure of commercial TiO2-P25, and is more favorable to the excitation of photon-generated carriers. Meanwhile, the light emission intensity of anatase phase is weaker, which is conducive to electron-hole separation, promoting the reactant intermediate conversion. In addition, compared with TiO2-P25, TiO2-NBS has better morphology and specific surface pore characteristics, more adsorption sites for CO2, and stronger adsorption strength, which facilitate the adsorption and activation reactions of CO2. As a result, TiO2-NBS exhibits stronger CO2 photothermal reduction activity, with CO and CH4 production rates of 6.49 µmol g−1 h−1 and 1.56 µmol g−1 h−1, which are 2.58 times and 2.84 times those of TiO2-P25, respectively.

Graphical Abstract