Ultra-thin g-C₃N₄ nanotubes with a wall thickness of about 10 nm were prepared by calcining a supramolecular precursor synthesized from cyanuric acid, melamine and urea. After Ag nanoparticles were deposited on the surface of g-C₃N₄ nanotubes and partially oxidized to Ag₂CrO₄, a g-C₃N₄/Ag/Ag₂CrO₄ ternary nanocomposite was obtained. The structural, optical and electronic properties of the composite were investigated. Compared with pure g-C₃N₄ nanotubes and g-C₃N₄ nanotubes decorated with Ag nanoparticles, the photocatalytic performance of the ternary composite is much improved due to its large specific surface area and effective separation efficiency of photo-generated electron-hole pairs. Furthermore, the composite not only promotes the effective separation of photo-generated carriers, but also inhibits the photocorrosion of its Ag₂CrO₄ component. A Z-scheme photo-generated carrier transfer mechanism with strong redox ability between the components in the g-C₃N₄/Ag/Ag₂CrO₄ ternary composite is confirmed by constructing the band structure of the composite. The high photocatalytic degradation performance of organic pollutants after several cycle tests makes it possible to be applied in practice.

通过煅烧由氰尿酸、三聚氰胺和尿素合成的超分子前体，制备壁厚约10nm的超薄gC ₃ N ₄纳米管。Ag纳米粒子沉积在gC ₃ N ₄纳米管表面并部分氧化为Ag ₂ CrO _{4 后}，得到gC ₃ N ₄ /Ag/Ag ₂ CrO ₄三元纳米复合材料。研究了复合材料的结构、光学和电子性能。与纯gC ₃ N ₄纳米管和gC ₃ N _{4 相比}用银纳米粒子装饰的纳米管，由于其大的比表面积和光生电子-空穴对的有效分离效率，三元复合材料的光催化性能得到了很大的提高。此外，该复合材料不仅促进了光生载流子的有效分离，而且还抑制了其Ag ₂ CrO ₄组分的光腐蚀。gC ₃ N ₄ /Ag/Ag ₂ CrO ₄组分间具有强氧化还原能力的Z型光生载流子转移机制三元复合材料通过构建复合材料的能带结构得到证实。有机污染物经过多次循环试验后的高光催化降解性能使其有可能在实际中应用。