Reduced g-C₃N₄ material was prepared by a thermal treatment of g-C₃N₄ in presence of NaBH₄ under N₂ atmosphere. The prepared catalyst material was characterized by using elemental analyzer, FTIR and XPS and the analysis showed that the reduction treatment created nitrogen vacancies followed by a formation of functional group CN owing to a break-up reaction in the pyridine nitride of a s-triazine-C₃N₄. The findings of UV–vis DRS and DFT calculation revealed that the formed functional group CN results in a narrowed energy band gap owing to positive shift in the conduction band as well as valence band. The downshift observed in the valence band level made the catalyst material with a feature of visible light-driven water oxidation capacity, that was confirmed by the electron and hole sacrifice and OH trapping-EPR techniques. The intermediate energy level within the band gap of g-C₃N₄ originated from the vacancies caused an extended absorption, especially to the visible region. The analysis of PL emission spectrum confirmed that the reduction treatment could facilitate the spatial separation of photo-excited electron and hole, and enhance the charge transfer as well. RDE studies showed that the selective production of H₂O₂ by two-electron reduction of O₂ was a predominant reaction step using the reduced g-C₃N₄. The reduced g-C₃N₄ prepared at 370 °C exhibited an efficient visible light driven catalytic performance on H₂O₂ production (170 μmol/L h⁻¹) from pure H₂O and O₂ at ambient atmosphere in the absence of organic electron donors. The solar-to-H₂O₂ chemical conversion efficiency and apparent quantum yield approached to ∼0.26%, ∼4.3%, respectively. In addition, the experimental results obtained on recycling of the prepared g-C₃N₄ evidenced the photocatalytic stability of the material.

降低GC ₃ Ñ ₄材料通过利用GC进行热处理制备₃ Ñ ₄中的NaBH存在₄氮气氛下₂气氛。使用元素分析仪，FTIR和XPS对制得的催化剂材料进行了表征，分析表明，还原处理产生了氮空位，随后由于s-三嗪的吡啶氮化物中的分解反应而形成了官能团C N。 -C ₃ N ₄。UV-vis DRS和DFT计算的结果表明，形成的官能团C由于导带和价带的正向偏移，N导致能带隙变窄。在价带水平上观察到的下降使催化剂材料具有可见光驱动的水氧化能力，这一点已通过电子和空穴牺牲以及OH捕集-EPR技术得到了证实。gC ₃ N ₄的带隙内的中间能级由空位引起，引起了吸收的扩展，尤其是到可见光区域的吸收。PL发射光谱的分析证实，还原处理可以促进光激发电子和空穴的空间分离，并且还增强电荷转移。RDE研究表明H ₂ O ₂的选择性产生O ₂的两电子还原反应是使用还原后的gC ₃ N ₄的主要反应步骤。在370°C下制备的还原gC ₃ N ₄表现出有效的可见光驱动的催化性能，该反应性能是在环境气氛下，在不存在有机物的情况下，由纯H ₂ O和O ₂产生H ₂ O ₂（170μmol/ L h ^-1）的过程。电子供体。太阳到H ₂ O _2的化学转化效率和表观量子产率分别达到〜0.26％，〜4.3％。此外，回收制得的gC ₃的实验结果N ₄证明了该材料的光催化稳定性。