Graphitic carbon nitride (g-C₃N₄) photocatalysts have attracted much attention towards harvesting solar energy for applications in energy and environment sectors. However, separation of electron-hole pairs is an intrinsic problem for the bulk g-C₃N₄. Here, we report the tiny amount of carbon doped TiO₂ modified g-C₃N₄ (C-TiO₂/g-C₃N₄) with a narrow bandgap and prolonged lifetime of charge carriers. This heterojunction photocatalysts were successfully fabricated via a facile heat treatment under atmosphere. The enhanced separation of photogenerated charge carriers and narrow band gap confer superior photocatalytic activities with 5.728 mmol/g photogenerated hydrogen gas for 5 h and 52.395 mmol/g for 64 h in triethanolamine aqueous solution. The apparent quantum efficiency of C-TiO₂/g-C₃N₄ is ~6.2% under 420 nm irradiation, which is about 2.4 times higher than the corresponding value 2.6% of pristine g-C₃N₄. This photocatalyst with excellent photocatalytic performance and photo-stability can work as a promising candidate to applicate in solar-to-fuel conversion and environmental remediation.

中文翻译：

---

通过原位热处理对掺碳的TiO ₂修饰的gC ₃ N ₄进行合理设计，以显着改善光催化氢并具有出色的光稳定性

石墨化的氮化碳（gC ₃ N ₄）光催化剂已吸引了很多注意力，以收集用于能源和环境领域的太阳能。然而，电子-空穴对的分离对于块体gC ₃ N ₄是一个固有的问题。在这里，我们报告了少量的碳掺杂的TiO ₂改性的gC ₃ N ₄（C-TiO ₂ / gC ₃ N ₄）的窄带隙并延长了电荷载流子的寿命。该异质结光催化剂是通过在大气中进行简便的热处理成功制备的。光生电荷载体的分离增强和窄带隙赋予其优异的光催化活性，在三乙醇胺水溶液中，光生氢为5.728 mmol / g，光生氢为5 h，52.395 mmol / g为64 h。C-TiO ₂ / gC ₃ N ₄的表观量子效率在420 nm辐照下约为6.2％，是原始gC ₃ N ₄对应值2.6％的约2.4倍。。这种具有出色的光催化性能和光稳定性的光催化剂可以作为有前途的候选物应用于太阳能到燃料的转化和环境修复。