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Biosynthesised palladium nanoparticles using Eucommia ulmoides bark aqueous extract and their catalytic activity

机译：杜鹃花皮提取物生物合成钯纳米粒子及其催化活性

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Palladium nanoparticles (PdNPs) are of great importance as catalytic materials. Their synthesis has been widely studied and interest in their properties is growing. Bio-based methods might be a greener option for designing the PdNPs with reduced environmental impacts. This study reports the synthesis of PdNPs by utilising the aqueous extract of medicinally important () bark which functions as both reducing and capping agent in moderate reaction conditions. Reduction potential of bark aqueous extract was about −0.08 V vs. saturated calomel electrode by open-circuit voltage method and the rich polyphenolics was confirmed by cyclic voltammetry, which helps to reduce palladium ions to PdNPs. The characterisation through high-resolution transmission electron microscopic, energy dispersive X-ray spectroscopy and X-ray diffraction infer that the as-synthesised PdNPs were spherical in shape with a face cubic crystal structure. The results from dynamic light scattering suggest the PdNPs have the narrow size distribution with an average size of 12.6 nm. The lower zeta potential (−25.3 mV) and the Fourier transform infrared spectra indicate that the as-synthesised PdNPs keep remarkably stable for a long period due to the capped biomolecules on the nanoparticle surface. This method for synthesis of PdNPs is simple, economic, non-toxic and efficient. The PdNPs show excellent catalytic activity for the electro-catalytic oxidation of hydrazine and the catalytic reducing degradation of -aminoazobenzene, a model compound of azo-dyes.
机译：钯纳米颗粒（PdNPs）作为催化材料非常重要。它们的合成已被广泛研究，并且对其性能的兴趣也在增长。基于生物的方法可能是设计对环境影响减小的PdNP的绿色选择。这项研究报告了通过利用具有医学重要性的树皮的水提取物合成PdNPs，该树皮在中等反应条件下既起还原剂的作用，又起封端剂的作用。通过开路电压法，树皮水提取物相对于饱和甘汞电极的还原电势约为-0.08 V，并且通过循环伏安法证实了富含的多酚，这有助于将钯离子还原为PdNPs。通过高分辨率透射电子显微镜，能量色散X射线能谱和X射线衍射的表征推断，所合成的PdNP为球形，具有面立方晶体结构。动态光散射的结果表明，PdNP具有窄的尺寸分布，平均尺寸为12.6 nm。较低的zeta电位（−25.3 mV）和傅立叶变换红外光谱表明，由于纳米颗粒表面上的生物分子被封端，因此合成后的PdNP在很长一段时间内保持非常稳定。这种合成PdNP的方法简单，经济，无毒且有效。 PdNPs对肼的电催化氧化和偶氮染料的典范化合物-氨基偶氮苯的催化还原降解表现出优异的催化活性。

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