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<p>Designing catalysts with suitable valence conduction band positions to generate reactive oxygen species (ROS) with moderate redox capacity is to achieve efficient photocatalytic biomass-selective value-added oxidation. This protocol addresses the issue by tuning material structural defects, altering the surface electronic structure, and ultimately enhancing the raw material’s performance. Here, an appropriate amount of one - dimensional nanorods <i>α</i>-MnO<sub>2</sub> adjusted material structural defects, increased the adsorbed oxygen (O<sub>ads</sub>)/lattice oxygen (O<sub>latt</sub>) and Mn<sup>3+</sup> ratios, and served as an electron transport conduit, facilitating O₂ activation to generate ROS. The Cd<sub>1.7</sub>In<sub>2</sub>S<sub>4.7</sub> solid solution enables the optimal valence band position by adjusting the Cd<sup>2+</sup>: In<sup>3+</sup> ratio, thus selectively oxidizing 5-hydroxymethylfurfural (HMF) to 2,5-dicarbonylfuran (DFF). In <i>situ</i> XPS revealed that photogenerated electrons in Cd<sub>1.7</sub>In<sub>2</sub>S<sub>4.7</sub> quickly transferred to the conduction band of <i>α</i>-MnO<sub>2</sub>, and photogenerated holes from <i>α</i>-MnO<sub>2</sub> moved to the valence band of Cd<sub>1.7</sub>In<sub>2</sub>S<sub>4.7</sub>. This significantly enhanced the separation and transfer efficiency of photogenerated carriers at the interface. The optimal sample achieved 56% conversion of HMF and 72% selectivity of DFF under simulated sunlight. This protocol provides a new approach for the establishment of electron transport channel structures based on <i>α</i>-MnO<sub>2</sub> constructs and value-added biomass photocatalytic conversion under simulated sunlight.</p>

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Electron transport channel-mediated Z-type α-MnO2/Cd1.7In2S4.7 heterojunction for photocatalytic conversion of 5-hydroxymethylfurfural to 2,5-dicarbonylfuran

  • 期刊论文

  • 发表日期：

    2026年3月13日

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  • Yuwei Liang,
  • Yufan Huang,
  • Chunling Hu,
  • Jinyu Cai,
  • Yifan Cao,
  • Guihua Meng,
  • Jianning Wu,
  • Qi Li,
  • Zhiyong Liu

摘要

Designing catalysts with suitable valence conduction band positions to generate reactive oxygen species (ROS) with moderate redox capacity is to achieve efficient photocatalytic biomass-selective value-added oxidation. This protocol addresses the issue by tuning material structural defects, altering the surface electronic structure, and ultimately enhancing the raw material’s performance. Here, an appropriate amount of one - dimensional nanorods α-MnO2 adjusted material structural defects, increased the adsorbed oxygen (Oads)/lattice oxygen (Olatt) and Mn3+ ratios, and served as an electron transport conduit, facilitating O₂ activation to generate ROS. The Cd1.7In2S4.7 solid solution enables the optimal valence band position by adjusting the Cd2+: In3+ ratio, thus selectively oxidizing 5-hydroxymethylfurfural (HMF) to 2,5-dicarbonylfuran (DFF). In situ XPS revealed that photogenerated electrons in Cd1.7In2S4.7 quickly transferred to the conduction band of α-MnO2, and photogenerated holes from α-MnO2 moved to the valence band of Cd1.7In2S4.7. This significantly enhanced the separation and transfer efficiency of photogenerated carriers at the interface. The optimal sample achieved 56% conversion of HMF and 72% selectivity of DFF under simulated sunlight. This protocol provides a new approach for the establishment of electron transport channel structures based on α-MnO2 constructs and value-added biomass photocatalytic conversion under simulated sunlight.