Nitrogen vacancies contained all-organic g-C₃N/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, Wing Kei HO

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Abstract

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-C₃N 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-C₃N). 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. Copyright © 2024 Elsevier B.V. All rights reserved.

Original languageEnglish
Article number174004
JournalJournal of Alloys and Compounds
Volume984
Early online dateFeb 2024
DOIs
Publication statusPublished - May 2024

Citation

Zhao, B., Lu, D., Kondamareddy, K. K., Gu, W., Li, J., Tian, T., Li, L., Fan, H., & Ho, W. (2024). Nitrogen vacancies contained all-organic g-C₃N₄/tetra (4-carboxylphenyl) porphyrin heterojunction formed with π-π interactions for efficient visible light photocatalytic performance. Journal of Alloys and Compounds, 984, Article 174004. https://doi.org/10.1016/j.jallcom.2024.174004

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