Abstract In this study, we prepared lichen reduced-graphene oxide (LrGO)-bimetallic nanoparticle nanocomposites (LrGO-AgAu) by applying a green, facile and one pot approach. LrGO-AgAu was synthesized via simultaneous reduction of graphene oxide (GO), AgNO3 and HAuCl4 with Cetraria Islandica (L.) Ach. extract. Characterization of the prepared nanocomposites were carried out by transmission electron microscopy (TEM), scanning electron microscopy (SEM), ultraviolet-visible (UV-Vis) spectroscopy, X-Ray Diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and thermogravimetric analysis (TGA). The synthesized LrGO-AgAu bimetallic nanoparticle nanocomposites were used for catalytic conversion of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) with NaBH4. The effect of nanocomposite composition on catalytic activity was examined. It is obtained that AgAu bimetallic nanoparticles with small particle sizes were decorated LrGO nanosheets homogenously and superior catalytic performance was achieved for the decomposition of 4-NP. The results showed that catalytic reduction reaction of 4-NP to 4-AP with noble metallic NPs nanocatalysts obtained by lichen extract is a facile and low-cost approach for removal.

中文翻译：

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还原氧化石墨烯-AgAu双金属纳米复合材料的绿色合成：催化性能

摘要 在本研究中，我们采用绿色、简便的一锅法制备了地衣还原氧化石墨烯 (LrGO)-双金属纳米颗粒纳米复合材料 (LrGO-AgAu)。LrGO-AgAu 是通过用 Cetraria Islandica (L.) Ach 同时还原氧化石墨烯 (GO)、AgNO3 和 HAuCl4 合成的。提炼。通过透射电子显微镜 (TEM)、扫描电子显微镜 (SEM)、紫外-可见 (UV-Vis) 光谱、X 射线衍射 (XRD)、傅里叶变换红外 (FTIR) 光谱和热重分析对制备的纳米复合材料进行表征。分析（TGA）。合成的 LrGO-AgAu 双金属纳米颗粒纳米复合材料用于将 4-硝基苯酚 (4-NP) 与 NaBH4 催化转化为 4-氨基苯酚 (4-AP)。检查了纳米复合材料组合物对催化活性的影响。结果表明，小粒径的AgAu双金属纳米粒子被均匀地装饰在LrGO纳米片上，对4-NP的分解具有优异的催化性能。结果表明，通过地衣提取物获得的贵金属 NPs 纳米催化剂将 4-NP 催化还原为 4-AP，是一种简便、低成本的去除方法。