Abstract Photocatalysis technology has stimulated extensive research interest in various fields, but several limitations, such as the inefficient separation ratio of photo-generated charges and the possible release of metal ions from metal oxides or sulfides, need to be overcome before its practical application. Herein, we fabricated a metal-free carbonaceous composite photocatalyst via modification of 2D polymeric carbon nitride (PCN) with 0D graphene quantum dots (GQDs) by an ultrasound-assisted route. Characterization results clearly indicated the formation of 0D/2D composite structure with an intimately contacted interface, and the type II band structure promotes the charge separation between PCN and GQDs. As a result, an enhanced photocatalytic activity for degradation of dyes was achieved by the GQDs/PCN in comparison to the single PCN and GQDs. Furthermore, multiple cycling tests reflected the GQDs/PCN had relatively high photocatalytic durability. This study provides a facile method to construct carbonaceous composite and demonstrates it is a promising photocatalyst for environmental remediation.

中文翻译：

---

用于降解有机染料的碳质0D/2D复合光催化剂

摘要 光催化技术激发了各个领域的广泛研究兴趣，但在实际应用之前需要克服一些局限性，例如光生电荷的分离率低以及金属氧化物或硫化物可能释放金属离子。在此，我们通过超声辅助途径用 0D 石墨烯量子点 (GQD) 改性二维聚合氮化碳 (PCN)，制备了一种不含金属的碳质复合光催化剂。表征结果清楚地表明形成了具有紧密接触界面的 0D/2D 复合结构，并且 II 型能带结构促进了 PCN 和 GQD 之间的电荷分离。因此，与单一的 PCN 和 GQDs 相比，GQDs/PCN 实现了增强的降解染料的光催化活性。此外，多次循环测试表明 GQDs/PCN 具有较高的光催化耐久性。该研究为构建碳质复合材料提供了一种简便的方法，并证明它是一种有前景的环境修复光催化剂。