Abstract Pd(0) nanoparticles stabilized over polydopamine (PDA) capped magnetic GO/Fe3O4 nanocomposites (GO/Fe3O4@PDA/Pd) have been synthesized in variable Pd load following a post grafting approach. Pd has been reduced in situ by the functionalized PDA avoiding the use of external harsh reductant. The structural properties of the synthesized materials were studied by different analytical techniques like Field Emission Scanning electron microscopy (FESEM), Energy Dispersive X-ray Spectroscopy (EDX), High Resolution Transmission Electron Microscopy (HRTEM), Fourier Transformed Infrared (FT-IR) spectroscopy, Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES), Thermo Gravimetric Analysis (TGA), Powder X-Ray Diffraction (XRD) and X-ray Photoelectron Spectroscopy (XPS). The novel GO/Fe3O4@PDA/Pd(0) nanocomposite exhibited excellent performance as a reusable catalyst in the facile cyanation of aryl halides using K4[Fe(CN)6] as a low cost and safe cyanating agent. The aryl nitriles were obtained in good to excellent yields and the catalyst was recycled up to 13 times with minimal change in its catalytic activity.

中文翻译：

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钯纳米粒子锚定聚多巴胺包覆的氧化石墨烯/Fe3O4 纳米粒子（GO/Fe3O4@PDA/Pd）作为一种新型可回收多相催化剂，用于使用 K4[Fe(CN)6] 作为氰化物源的卤代芳烃轻松氰化

摘要 Pd(0) 纳米颗粒稳定在聚多巴胺 (PDA) 封端的磁性 GO/Fe3O4 纳米复合材料 (GO/Fe3O4@PDA/Pd) 上，采用后接枝方法在可变 Pd 负载下合成。Pd 已通过功能化的 PDA 原位还原，避免使用外部苛刻的还原剂。通过场发射扫描电子显微镜 (FESEM)、能量色散 X 射线光谱 (EDX)、高分辨率透射电子显微镜 (HRTEM)、傅里叶变换红外 (FT-IR) 等不同分析技术研究了合成材料的结构特性光谱、电感耦合等离子体原子发射光谱 (ICP-AES)、热重分析 (TGA)、粉末 X 射线衍射 (XRD) 和 X 射线光电子能谱 (XPS)。新型GO/Fe3O4@PDA/Pd(0)纳米复合材料作为一种可重复使用的催化剂，在使用K4[Fe(CN)6]作为一种低成本且安全的氰化剂轻松氰化芳基卤化物中表现出优异的性能。芳基腈以良好到极好的收率获得，催化剂最多可循环使用 13 次，其催化活性变化最小。