Metal cyanamide compounds are an emerging class of photoactive materials for solar energy applications. Although silver cyanamide (Ag₂NCN) applied in visible-light-driven photocatalysis has been demonstrated, the photocatalytic performance is unsatisfactory. Herein, a composite of Ag₂NCN nanoparticles supported on ultrathin carbon nitride (g-C₃N₄) nanosheets is synthesized by combining thermal annealing and an in situ precipitation method. Due to the band alignment between Ag₂NCN and g-C₃N₄, a type-II semiconductor heterojunction is built up to improve the photocatalytic activity of pristine Ag₂NCN. The as-prepared nanocomposites exhibit enhanced photocatalytic activity for organic dye decolorization under visible light irradiation compared with pure Ag₂NCN and pristine g-C₃N₄ nanosheets. The enhancement of photocatalytic performance can be ascribed to the synergistic effects between Ag₂NCN and g-C₃N₄, which include improved light absorption, superior charge separation, uniform dispersion and smaller size of Ag₂NCN loaded on high surface area g-C₃N₄ nanosheets. The kinetics model and degradation mechanism of the nanocomposites are also proposed.

中文翻译：

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氰氨化银纳米颗粒装饰了超薄石墨氮化碳纳米片，增强了可见光驱动的光催化作用†

金属氰胺化合物是用于太阳能应用的一类新兴的光敏材料。尽管已经证明了在可见光驱动的光催化中应用了氰氨化银（Ag ₂ NCN），但是光催化性能并不令人满意。在此，通过结合热退火和原位沉淀法来合成负载在超薄氮化碳（gC ₃ N ₄）纳米片上的Ag ₂ NCN纳米颗粒的复合材料。由于Ag ₂ NCN和gC ₃ N ₄之间的能带对准，建立了II型半导体异质结以提高原始Ag ₂的光催化活性。NCN。与纯Ag ₂ NCN和原始gC ₃ N ₄纳米片相比，所制备的纳米复合物在可见光照射下具有增强的对有机染料脱色的光催化活性。Ag ₂ NCN和gC ₃ N ₄之间的协同作用可归因于光催化性能的提高，包括改善的光吸收，优异的电荷分离，均匀的分散性和负载在高表面积gC ₃ N ₄上的Ag ₂ NCN的较小尺寸纳米片。还提出了纳米复合材料的动力学模型和降解机理。