Nitrogen vacancies contained all-organic g-C3N4/tetra (4-carboxylphenyl) porphyrin heterojunction formed with π-π interactions for efficient visible light photocatalytic performance

Bang Zhao, Dingze Lu, Kiran Kumar Kondamareddy, Wenju Gu, Jing Li, Tian Tian, Lianbi Li, Huiqing Fan, Wingkei Ho

科研成果: 期刊稿件文章同行评审

7 引用 (Scopus)

摘要

Defect engineering and heterojunction formation are essential for modifying photocatalysts to improve the separation efficiency of photogenerated carriers. In this work, an all-organic π-π interaction-based novel heterojunction (NVCN/TCPP), that combines nitrogen vacancies enriched-g-C3N4 and tetra (4-carboxylphenyl) porphyrin (TCPP) was synthesized. Scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR/TEM), X-ray diffraction (XRD), Fourier Transform-Infrared (FT-IR) spectroscopy, Brunauer-Emmett-Teller (BET) test, and X-ray photoelectron spectroscopy (XPS) were used to investigate the surface morphology, micromorphology, crystal structure, and functional groups in the samples. Both NVCN and TCPP had a two-dimensional nanosheet morphology. The electron paramagnetic resonance (EPR) results confirmed the existence of nitrogen vacancies in graphitic carbon nitride (g-C3N4). The photocatalytic performance of the composites was evaluated by the degradation of Rhodamine B (RhB) under visible light. NVCN/TCPP-1 showed the best photocatalytic performance, which was attributed to the synergistic effect of nitrogen vacancies and TCPP present in the composite that facilitated the separation and transfer of photogenerated carriers. We conducted a thorough investigation into the mechanism for enhanced photocatalysis and presented a Z-scheme heterojunction mechanism to explain our findings. This study could serve as a valuable reference for the construction of organic heterojunctions.

源语言英语
文章编号174004
期刊Journal of Alloys and Compounds
984
DOI
出版状态已出版 - 15 5月 2024

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