The photocatalytic performances of graphitic carbon nitride (GCN) are dramatically limited by rapid charge carriers’ combination and the low utilization of photo-excited electrons and holes thereafter. To address this, we employed a wet impregnation approach to anchor single platinum atoms onto holy carbon nitride nanosheets (Pt_SA-HCNNS). The X-ray absorption fine structure and density functional theory calculations illustrated that Pt_SA-HCNNS was equipped with Pt–N₄ coordination, which was favorable for oxygen absorption and the generation of reactive oxidation species. As a result, Pt_SA-HCNNS exhibited significantly enhanced photocatalytic activity for evolving reactive species and degrading herbicide (halosulfuron-methyl) than pristine GCN and Pt cluster-decorated GCN. In addition, Pt_SA-HCNNS was capable of simultaneously removing five commonly used sulfonylurea herbicides and reducing their phytotoxicity toward soybean seedlings. This work offers a facile approach to developing high-performance porous carbon nitride with single Pt doping for sustainable photocatalytic purification.

石墨氮化碳 (GCN) 的光催化性能受到快速电荷载流子组合和其后光激发电子和空穴利用率低的显着限制。为了解决这个问题，我们采用湿法浸渍方法将单个铂原子锚定到神圣的氮化碳纳米片（Pt _SA -HCNNS）上。X射线吸收精细结构和密度泛函理论计算表明，Pt _SA -HCNNS具有Pt-N ₄配位，有利于氧的吸收和活性氧化物的产生。因此，铂_SA与原始 GCN 和 Pt 簇修饰的 GCN 相比，-HCNNS 对进化活性物种和降解除草剂（卤磺隆）表现出显着增强的光催化活性。此外，Pt _SA -HCNNS 能够同时去除五种常用的磺酰脲类除草剂并降低其对大豆幼苗的药害。这项工作为开发具有单 Pt 掺杂的高性能多孔氮化碳提供了一种简便的方法，用于可持续的光催化净化。