Herein, we have reported the real-time photodegradation of methylene blue (MB), an organic pollutant, in the presence of sunlight at an ambient temperature using a platinum-decorated reduced graphene oxide (rGO/Pt) nanocomposite. The photocatalyst was prepared via a simple, one-pot and green approach with the simultaneous reduction of GO and Pt using aqueous honey as a reducing agent. Moreover, the honey not only simultaneously reduced Pt ions and GO but also played a key role in the growth and dispersion of Pt nanoparticles on the surface of rGO. Various rGO/Pt nanocomposites with different percentages of Pt nanoparticles loaded on rGO were obtained by tuning the concentration of the Pt source. The high percentage of Pt nanoparticles with an average size of 2.5 nm dispersed on rGO has shown excellent electrochemical performance. The photocatalytic activity of the rGO/Pt composite was enhanced by increasing the weight percent of the Pt particles on rGO, which led to the formation of a highly efficient photocatalyst. The optimized photocatalyst exhibited remarkable photocatalytic activity and degraded 98% MB in 180 minutes; thus, it can be used for industrial and environmental applications.

中文翻译：

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通过绿色方法合成的rGO/Pt纳米复合材料的实时监测光催化活性和电化学性能

在此，我们报道了使用铂装饰的还原氧化石墨烯（rGO/Pt）纳米复合材料在环境温度下在阳光存在下对亚甲基蓝（MB）这种有机污染物进行实时光降解。该光催化剂是通过简单、一锅法和绿色的方法制备的，使用水性蜂蜜作为还原剂同时还原 GO 和 Pt。此外，蜂蜜不仅同时还原了Pt离子和GO，而且对Pt纳米颗粒在rGO表面的生长和分散起到了关键作用。通过调节 Pt 源的浓度，获得了 rGO 上负载不同百分比的 Pt 纳米颗粒的各种 rGO/Pt 纳米复合材料。平均尺寸为 2.5 nm 的 Pt 纳米粒子高比例分散在 rGO 上，表现出优异的电化学性能。通过增加 rGO 上 Pt 颗粒的重量百分比，可以增强 rGO/Pt 复合材料的光催化活性，从而形成高效光催化剂。优化后的光催化剂表现出显着的光催化活性，180分钟内降解98%的MB；因此，它可用于工业和环境应用。