Abstract Choosing a suitable two-dimensional (2D) nanomaterial as a carrier for noble metals is crucial for improving the catalytic performance and reducing the cost of nanocatalysts. In this study, we used ultrathin porous g-C3N4 nanosheets (g-C3N4-NS) as a carrier with gold nanoparticles (Au NPs) anchored on the surface. The ultrathin g-C3N4-NS was advantageous as a carrier because of its large specific surface area, abundant in-plane holes, and low cost. For comparison, 2D TiO2 nanosheets (NS), graphene oxide (GO) NS, and bulk g-C3N4 (g-C3N4-B) were also tested as carriers for the immobilization of Au NPs. Au NPs supported on different carriers were employed as catalysts for the reduction of 4-nitrophenol. The rate constant was calculated as 16.21 × 10−3 s−1 for the Au/g-C3N4-NS nanocatalyst, which was 11.4 and 42.1 times higher than those for the Au/TiO2 and Au/GO nanocomposites, respectively. Au/g-C3N4-NS exhibited excellent catalytic activity during the conversion of 4-nitrophenol with a turnover frequency of 1648 h−1. The as-prepared Au/g-C3N4-NS nanocatalyst also exhibited good catalytic performance during the reduction of 2-nitrophenol and 3-nitrophenol.

中文翻译：

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不同二维载体负载Au纳米颗粒的催化性能比较

摘要 选择合适的二维（2D）纳米材料作为贵金属的载体对于提高纳米催化剂的催化性能和降低成本至关重要。在这项研究中，我们使用超薄多孔 g-C3N4 纳米片 (g-C3N4-NS) 作为载体，其表面固定有金纳米粒子 (Au NPs)。超薄 g-C3N4-NS 具有大的比表面积、丰富的面内孔和低成本作为载体的优势。为了进行比较，还测试了二维 TiO2 纳米片 (NS)、氧化石墨烯 (GO) NS 和块状 g-C3N4 (g-C3N4-B) 作为固定 Au NP 的载体。负载在不同载体上的金纳米颗粒被用作还原 4-硝基苯酚的催化剂。Au/g-C3N4-NS纳米催化剂的速率常数计算为16.21×10-3 s-1，分别为11.4和42。分别比 Au/TiO2 和 Au/GO 纳米复合材料高 1 倍。Au/g-C3N4-NS 在 4-硝基苯酚的转化过程中表现出优异的催化活性，转换频率为 1648 h-1。所制备的 Au/g-C3N4-NS 纳米催化剂在还原 2-硝基苯酚和 3-硝基苯酚过程中也表现出良好的催化性能。