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<p>Herein, the effects of precursor (urea, melamine, and dicyandiamide), calcination temperature, and Pt/Au loading on the photothermal carbon dioxide reduction performance of g-C<sub>3</sub>N<sub>4</sub> catalyst were studied, and its physicochemical and photochemical properties were characterized. The results showed that the increase of calcination temperature stabilized the crystal structure but decreased the carbon dioxide adsorption and light absorption capacity. Urea-derived g-C<sub>3</sub>N<sub>4</sub> calcined at 550&#xa0;°C achieved CO and CH<sub>4</sub> yields of 1.42 and 0.21 µmol·g<sup>-1</sup>·h<sup>-1</sup>, respectively, which had the strongest photoelectron transfer capacity and catalytic efficiency. Through the surface plasmon effect, Pt and Au can effectively improve the light absorption property and charge transfer efficiency of g-C<sub>3</sub>N<sub>4</sub> catalyst, thus effectively improving the catalytic performance. Pt loading (2 wt%) enhanced CH<sub>4</sub> selectivity to 64.4% (vs. 12.9% for pure g-C<sub>3</sub>N<sub>4</sub>), while Au loading (3 wt%) boosted CO production to 4.17 µmol·g<sup>-1</sup>·h<sup>-1</sup>, A higher noble metal loading ratio leads to a decline in catalytic performance, possibly due to the agglomeration of precious metal particles.</p> Graphic Abstract <p></p>

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Study on the Effect and Mechanism of Precursor, Calcination and Noble Metal Loading on Graphitic Carbon Nitride Catalysts for Carbon Dioxide Photo-Thermal Reduction

  • 期刊论文

  • 发表日期：

    2025年8月8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,
  • Junjie Gao,
  • Luyang Zhang,
  • Tiankui Zhu,
  • Wenbo Zeng,
  • Minfan Qian,
  • Zhangtong Li,
  • Yang Lu,
  • Shuai Chen,
  • Zhen Huang

摘要

Herein, the effects of precursor (urea, melamine, and dicyandiamide), calcination temperature, and Pt/Au loading on the photothermal carbon dioxide reduction performance of g-C3N4 catalyst were studied, and its physicochemical and photochemical properties were characterized. The results showed that the increase of calcination temperature stabilized the crystal structure but decreased the carbon dioxide adsorption and light absorption capacity. Urea-derived g-C3N4 calcined at 550 °C achieved CO and CH4 yields of 1.42 and 0.21 µmol·g-1·h-1, respectively, which had the strongest photoelectron transfer capacity and catalytic efficiency. Through the surface plasmon effect, Pt and Au can effectively improve the light absorption property and charge transfer efficiency of g-C3N4 catalyst, thus effectively improving the catalytic performance. Pt loading (2 wt%) enhanced CH4 selectivity to 64.4% (vs. 12.9% for pure g-C3N4), while Au loading (3 wt%) boosted CO production to 4.17 µmol·g-1·h-1, A higher noble metal loading ratio leads to a decline in catalytic performance, possibly due to the agglomeration of precious metal particles.

Graphic Abstract