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<p>Photocatalytic reduction of CO<sub>2</sub> into chemical fuels under visible light has garnered increasing attention. Herein, we designed silver nanoparticle (Ag NPs)/carbon quantum dot (CQDs)/TiO<sub>2</sub> nanotubes (TNTs) nanocomposites via a hydrothermal process combined with an in-situ photod-eposition method. Results of methylene blue photodegradation tests under visible light demonstrated that Ag/CQDs/TNTs exhibited higher photocatalytic efficiency than pristine TNTs. In addition, in the carbon dioxide photoreduction experiment, the optimized Ag/CQDs/TNTs has a photocatalytic yield of 38.33 µmol g<sup>-1</sup> h<sup>-1</sup> when carbon dioxide is converted into carbon monoxide, which is 5.3 times that of pure TNTs. Detailed experimental characterizations revealed that the enhanced photocatalytic performance of Ag/CQDs/TNTs stemmed from the surface plasmon resonance effect of Ag NPs and the excellent optoelectronic properties of CQDs. This work offers insights for fabricating ternary catalysts for photocatalytic CO<sub>2</sub> reduction.</p>

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Synthesis of Ag/Carbon quantum Dots/TiO2 nanotubes for efficient photocatalytic degradation and CO2 reduction

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • Xiao-jie Song,
  • Tong-juan Weng,
  • Jing-wen Li,
  • Wei-wei Dong,
  • Yue Sun,
  • Shuai-peng Liu,
  • Won-Chun Oh

摘要

Photocatalytic reduction of CO2 into chemical fuels under visible light has garnered increasing attention. Herein, we designed silver nanoparticle (Ag NPs)/carbon quantum dot (CQDs)/TiO2 nanotubes (TNTs) nanocomposites via a hydrothermal process combined with an in-situ photod-eposition method. Results of methylene blue photodegradation tests under visible light demonstrated that Ag/CQDs/TNTs exhibited higher photocatalytic efficiency than pristine TNTs. In addition, in the carbon dioxide photoreduction experiment, the optimized Ag/CQDs/TNTs has a photocatalytic yield of 38.33 µmol g-1 h-1 when carbon dioxide is converted into carbon monoxide, which is 5.3 times that of pure TNTs. Detailed experimental characterizations revealed that the enhanced photocatalytic performance of Ag/CQDs/TNTs stemmed from the surface plasmon resonance effect of Ag NPs and the excellent optoelectronic properties of CQDs. This work offers insights for fabricating ternary catalysts for photocatalytic CO2 reduction.