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<p>The design and construction of vertical heteroepitaxial structures, although challenging, offer an ideal approach due to their open charge transport pathways and strong interfacial coupling effects. Herein, a supramolecular precursor derived from melamine and cyanuric acid was synthesized <i>via</i> sulfuric acid-assisted hydrothermal treatment. Subsequent temperature-controlled calcination enabled the <i>in situ</i> formation of a carbon nitride-based homojunction photocatalyst (CN/S-TCN) featuring a vertical epitaxial structure. This unique configuration effectively integrates the vertically aligned geometry with the intrinsic two-dimensional layered structure of graphitic carbon nitride. Consequently, the CN/S-TCN homojunction exhibits shortened charge transfer pathways, accelerated surface charge transfer kinetics, optimized band structure, and increased active site density. As a result, the CN/S-TCN catalyst demonstrated exceptional visible-light photocatalytic activity and stability, achieving 89% degradation of tetracycline hydrochloride (TCH) within one hour. Radical trapping experiments identified superoxide radicals (<sup>·</sup>O<sub>2</sub><sup>−</sup>) as the predominant active species responsible for TCH degradation. This work provides a valuable foundation for the design of such composite materials and the development of efficient photocatalysts.</p>

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Epitaxial Vertical Growth of Carbon Nitride-based Homojunction Composites for Enhanced Photocatalytic Degradation of Tetracycline Hydrochloride

  • 期刊论文

  • 发表日期：

    2025年7月10日

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  • Juanfeng Gao,
  • Xiao Lin,
  • Bowen Jiang,
  • Senpei Tang,
  • Haiyan Zhang,
  • Feitai Chen,
  • Zhiliang Jin,
  • Youji Li,
  • Noritatsu Tsubaki

摘要

The design and construction of vertical heteroepitaxial structures, although challenging, offer an ideal approach due to their open charge transport pathways and strong interfacial coupling effects. Herein, a supramolecular precursor derived from melamine and cyanuric acid was synthesized via sulfuric acid-assisted hydrothermal treatment. Subsequent temperature-controlled calcination enabled the in situ formation of a carbon nitride-based homojunction photocatalyst (CN/S-TCN) featuring a vertical epitaxial structure. This unique configuration effectively integrates the vertically aligned geometry with the intrinsic two-dimensional layered structure of graphitic carbon nitride. Consequently, the CN/S-TCN homojunction exhibits shortened charge transfer pathways, accelerated surface charge transfer kinetics, optimized band structure, and increased active site density. As a result, the CN/S-TCN catalyst demonstrated exceptional visible-light photocatalytic activity and stability, achieving 89% degradation of tetracycline hydrochloride (TCH) within one hour. Radical trapping experiments identified superoxide radicals (·O2−) as the predominant active species responsible for TCH degradation. This work provides a valuable foundation for the design of such composite materials and the development of efficient photocatalysts.