In this work, a composite photocatalyst consisted of the porous graphitic carbon nitride (pg-C₃N₄) nanosheets decorated with in-situ grown gold (Au) nanoparticles were prepared. By characterizing and analyzing chemical compositions and structures, and optical and electrical properties of this Au/pg-C₃N₄ composite, the excellent photocatalytic performance mainly comes from the following aspects: firstly, pg-C₃N₄ synthesized from melamine by high-temperature calcination with the assistance of ascorbic acid has larger specific surface area and narrower band gap width than common g-C₃N₄; secondly, localized surface plasmon resonance (LSPR) effect of Au nanoparticles can enhance light absorption of pg-C₃N₄ via near-field enhancement-induced excitation; thirdly, the heterojunction formed between Au nanoparticles and pg-C₃N₄ nanosheets can promote electron transfer. Consequently, Au/pg-C₃N₄ presented the obvious improvement of photocatalytic activity on the degradation of rhodamine B and amaranth under simulated solar irradiation that the kinetic rate constant of degradation reaction can be increased by 3.9 and 5.7 times compared with g-C₃N₄, respectively.

中文翻译：

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使用金纳米颗粒装饰的多孔 g-C3N4 纳米片光催化降解有机污染物

在这项工作中，制备了一种复合光催化剂，由多孔石墨氮化碳 (pg-C ₃ N ₄ ) 纳米片组成，并用原位生长的金 (Au) 纳米颗粒装饰。通过表征分析该Au/pg-C ₃ N ₄复合材料的化学成分和结构、光学和电学性质，其优异的光催化性能主要来自以下几个方面：第一，三聚氰胺经高温合成pg-C ₃ N ₄ -抗坏血酸辅助高温煅烧比普通gC ₃ N ₄具有更大的比表面积和更窄的带隙宽度; 其次，Au纳米颗粒的局域表面等离子体共振（LSPR）效应可以通过近场增强诱导激发增强pg-C ₃ N _{4 的}光吸收；第三，Au纳米颗粒和pg-C ₃ N ₄纳米片之间形成的异质结可以促进电子转移。因此，Au/pg-C ₃ N ₄在模拟太阳辐照下对罗丹明B和苋菜红的降解表现出明显的光催化活性，降解反应的动力学速率常数比gC ₃ N提高了3.9和5.7倍。₄、分别。