A novel 2D heterojunction composite photocatalyst Co-g-C₃N₄/MoS₂ obtained by coupling Co-doped g-C₃N₄ and MoS₂ nanosheets has been successfully fabricated via a facile impregnation and calcination method. The results of photocatalytic experiments showed that the as-prepared catalyst exhibited markedly enhanced photocatalytic activity. The rates for the degradation of rhodamine B (RhB) and hydrogen evolution under simulated sunlight irradiation using a catalyst were about 6.4 and 4.7 times higher than those of pristine g-C₃N₄. Moreover, the photocatalytic activity of the as-prepared product was compared with that of the 2D heterojunction g-C₃N₄/MoS₂ or Co-doped g-C₃N₄ only. It was revealed that the photocatalytic activity of Co-g-C₃N₄/MoS₂ was better than those of g-C₃N₄/MoS₂ and Co-g-C₃N₄. The great improvement in photocatalytic activity performance is mainly ascribed to the Co-doping and formation of a 2D heterojunction, resulting in a fast charge carrier transfer, effective suppression of recombination of charge carriers, and an increase of light absorption. The doping amount of cobalt and the loading amount of MoS₂ have a great influence on the photocatalytic activity of g-C₃N₄, and they were studied in detail. The present work reveals that the combination of the formed-2D heterojunction with Co-doping should be a good strategy to boost the solar-light-driven photocatalytic activity of semiconductor catalysts.

中文翻译：

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具有增强的太阳光驱动光催化活性 的二维异质结光催化剂Co-gC ₃ N ₄ / MoS _2的制备

通过简便的浸渍和煅烧方法成功地制备了通过偶联Co掺杂的gC ₃ N ₄和MoS ₂纳米片而获得的新型二维异质结复合光催化剂Co-gC ₃ N ₄ / MoS ₂。光催化实验的结果表明，所制备的催化剂显示出显着增强的光催化活性。在使用催化剂的模拟阳光照射下，若丹明B（RhB）的降解速率和析氢速率比原始gC ₃ N ₄分别高约6.4倍和4.7倍。此外，仅将所制备产物的光催化活性与2D异质结gC ₃ N ₄ / MoS ₂或仅共掺杂的gC ₃ N _4进行了比较。结果表明，Co-gC ₃ N ₄ / MoS ₂的光催化活性优于gC ₃ N ₄ / MoS ₂和Co-gC ₃ N ₄的光催化活性。。光催化活性性能的极大提高主要归因于共掺杂和2D异质结的形成，从而导致电荷载流子快速转移，有效抑制了电荷载流子的复合以及光吸收的增加。钴的掺杂量和MoS ₂的负载量对gC ₃ N ₄的光催化活性有很大的影响，并对其进行了详细的研究。目前的工作表明，形成的2D异质结与Co掺杂的结合应该是提高半导体催化剂在太阳光驱动下的光催化活性的良好策略。