Stable, efficient, and reusable catalysts for wastewater treatment, promoting the catalytic elimination of environmental pollutants remains a current challenge. This work shows a one-pot synthesize Ag nanoparticles (AgNPs) supported on reduced graphene oxide (rGO/Ag) as a nanocatalyst. Morphological control of AgNPs was achieved by adding NH₄OH during the nucleation and growth processes leading to the spherical nanoparticles with average size of 9 ± 3 nm). Temperature increase promotes decrease of the oxygenated functional groups on rGO sheets, with an I_D/I_G = 0.57 at 300°C. Catalytic activity of rGO/Ag was investigated through the catalytic hydrogenation of methylene blue (MB) and rhodamine B (RhB) in the presence of NaBH₄ as a reducing agent. The proposed mechanism is based on the transfer of 2e⁻ and 1H⁺ between the nanocatalyst and the dye molecules. Dyes adsorption on the catalyst is a rate-determining step and was accelerated by the rGO support. X-ray photoelectron spectroscopy analysis before and after successive catalytic cycles indicated that the catalyst integrity was maintained, with a slight decrease in the silver amount from 4.53 to 3.78 at%. The decolorization reaction followed the pseudo-first-order kinetics model for both dyes, and our results showed an efficiency of around 30% higher than similar methods.

用于废水处理的稳定、高效和可重复使用的催化剂，促进环境污染物的催化消除仍然是当前的挑战。这项工作展示了在还原氧化石墨烯 (rGO/Ag) 上作为纳米催化剂的一锅合成银纳米粒子 (AgNPs)。AgNPs 的形态控制是通过在成核和生长过程中添加 NH ₄ OH实现的，导致球形纳米粒子的平均尺寸为 9 ± 3 nm）。温度升高会促进 rGO 片上含氧官能团的减少， 在 300°C 时I _D /I _G = 0.57。在 NaBH ₄存在下，通过亚甲蓝 (MB) 和罗丹明 B (RhB) 的催化氢化来研究 rGO/Ag 的催化活性作为还原剂。所提出的机制基于纳米催化剂和染料分子之间2 e ^-和 1H ⁺的转移。染料在催化剂上的吸附是一个决定速率的步骤，并被 rGO 载体加速。连续催化循环前后的 X 射线光电子能谱分析表明，催化剂的完整性得以保持，银含量从 4.53 原子％略微下降到 3.78 原子％。两种染料的脱色反应都遵循准一级动力学模型，我们的结果表明其效率比类似方法高约 30%。