Porous graphitic carbon nitride with controllable nitrogen vacancies: As promising catalyst for enhanced degradation of pollutant under visible light

• Published in: Materials & design Vol. 162; pp. 210 - 218
• Main Authors: Wang, Haiyan, Li, Mingxia, Li, Huan, Lu, Qiujun, Zhang, Youyu, Yao, Shouzhuo
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.01.2019; Elsevier
• Subjects: Controllable N vacancies; g-C3N5; NaOH-treated condensation of triazole rings; Outstanding photocatalytical; Photoelectrochemical performance; g-C3N5; Outstanding photocatalytical; NaOH-treated condensation of triazole rings; Controllable N vacancies; Photoelectrochemical performance
• ISSN: 0264-1275; 1873-4197
• DOI: 10.1016/j.matdes.2018.11.049

Carbon nitride (CN) materials are considered as promising photocatalysts due to the advantages of easy availability and visible light absorption. However, wide band gap and high recombination rates of electron-hole pairs of conventional CN materials remain the “bottleneck” of the photocatalysts. Therefore, it is necessary to develop an efficient strategy to narrow band gap of CN and accelerate its charge transfer. In addition, the introduction of nitrogen (N) vacancies is an efficient strategy to narrow band gap and reduce recombination rates of electron-hole pairs. Herein, a novel triazole ring-based graphite carbon nitride (g-C3N5) is developed by one step pathway of NaOH-assisted condensation of triazole rings for the first time. It is found that NaOH can control N vacancies and band gap of g-C3Nx. Meanwhile, the N vacancies of g-C3Nx gradually increase with the increasing concentration of NaOH in the range of 0.005–0.1 g, suppressing the recombination of photogenerated electron-hole pairs. The proposed g-C3Nx exhibits outstanding photocatalytical and photoelectrochemical performance. Therefore, the study highlights the significance of N vacancies in enhancing the photocatalytical and photoelectrochemical performance of promising g-C3N5. [Display omitted] •A novel triazole ring-based g-C3Nx is developed by one step pathway of NaOH-assisted condensation of triazole rings.•The nitrogen vacancies and band structures of the g-C3Nx can be controlled by tuning the mass ratio of precursor and NaOH.•The introduction of nitrogen vacancies suppresses the recombination of photogenerated electron-hole pairs of g-C3Nx.•The prepared N-deficient g-C3Nx exhibits outstanding photocatalytical and photoelectrochemical performance.