A novel CaCO₃/graphitic carbon nitride (g-C₃N₄) photocatalyst was synthesized for the first time via a facile calcination method using CaCO₃ and melamine as precursors. The as-prepared samples were characterized using various techniques, such as scanning and transmission electron microscopy, X-ray diffraction, Brunauer-Emmett-Teller analysis, as well as Fourier-transform infrared, X-ray photoelectron, photoluminescence, and UV–vis diffuse reflectance spectroscopy. The results of the experiments confirm the successful coupling of CaCO₃ to g-C₃N₄. The photocatalytic activity of the synthesized CaCO₃/g-C₃N₄ composites was evaluated by assessing their performance in the photocatalytic degradation of crystal violet (CV) in water under visible light irradiation. The analysis shows that CaCO₃/g-C₃N₄ exhibits higher photocatalytic activity towards CV degradation (76.0%) than pristine g-C₃N₄ (21.6%) and CaCO₃ (23.2%). Radical trapping and electron spin resonance experiments show that hydroxyl radicals (OH) and holes (h⁺) are the key reactive species in the photocatalytic process. The enhanced photocatalytic activity of the composite is mainly attributed to the efficient separation rate of electron-hole pairs achieved through the incorporation of CaCO₃.

以CaCO ₃和三聚氰胺为前体，通过简便的煅烧方法首次合成了新型的CaCO ₃ /石墨化碳氮化物（gC ₃ N ₄）光催化剂。使用各种技术对制备的样品进行表征，例如扫描和透射电子显微镜，X射线衍射，Brunauer-Emmett-Teller分析以及​​傅立叶变换红外光谱，X射线光电子，光致发光和紫外可见光谱漫反射光谱法。实验结果证实了CaCO ₃与gC ₃ N ₄的成功偶联。合成的CaCO ₃ / gC ₃ N的光催化活性通过评估_4种复合材料在可见光照射下在水中对结晶紫（CV）的光催化降解性能来评估。分析表明，CaCO ₃ / gC ₃ N ₄对CV降解表现出更高的光催化活性（76.0％），高于原始gC ₃ N ₄（21.6％）和CaCO ₃（23.2％）。自由基俘获和电子自旋共振实验表明，羟基自由基（OH）和空穴（h ⁺）是光催化过程中的关键反应物种。复合材料增强的光催化活性主要归因于通过掺入CaCO ₃达到的电子-空穴对的有效分离率。