Many organic and inorganic compounds have been developed as visible light driven photocatalysts for environment and energy application. In this work, a metal-free carbon doping–carbon nitride (BCM-C₃N₄) nanocomposite was synthesized by introducing barbituric acid and cyanuric acid during the polymerization of melamine. The BCM-C₃N₄ was characterized by structure, porosity, optical performance, and photoelectrochemical properties. Results demonstrated that BCM-C₃N₄ sample exhibited higher surface area, lower fluorescence intensity, better photocurrent signals and more efficient charge transfer in comparison to pure C₃N₄. The BCM-C₃N₄ exhibits excellent photocatalytic degradation ability of sulfamethazine (SMZ) under visible light irradiation. Much superior photocatalytic activity and high pollutant mineralization rate was achieved by BCM-C₃N₄, where it was 5 times than that of pristine C₃N₄. The effect of initial SMZ concentrations on photocatalyst was also investigated. Additionally, the trapping experiments and electron spin resonance tests demonstrated that the main active species, such as O₂⁻ and h⁺, could be produced under light irradiation. This work might provide an effective approach to the design of low-cost and highly efficient photocatalysis degradation systems for water treatment.

已经开发出许多有机和无机化合物作为可见光驱动的光催化剂，用于环境和能源的应用。在这项工作中，通过在三聚氰胺的聚合过程中引入巴比妥酸和氰尿酸，合成了无金属的碳掺杂-氮化碳（BCM-C ₃ N ₄）纳米复合材料。BCM-C ₃ N _4的特征在于结构，孔隙率，光学性能和光电化学性能。结果表明，与纯C ₃ N ₄相比，BCM-C ₃ N ₄样品具有更高的表面积，更低的荧光强度，更好的光电流信号和更有效的电荷转移。BCM-C₃ N ₄在可见光照射下具有优异的磺胺二甲嗪（SMZ）的光催化降解能力。BCM-C ₃ N _4的光催化活性和污染物矿化率高得多，是原始C ₃ N _4的5倍。还研究了初始SMZ浓度对光催化剂的影响。另外，该俘获实验和电子自旋共振测试表明，主要的活性物质，如ö ₂ ^-和H ⁺，可以在光照射下产生。这项工作可能为设计用于水处理的低成本和高效光催化降解系统提供一种有效的方法。