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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >A comparative study of the reduction of silver and gold salts in water by a cathodic microplasma electrode
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A comparative study of the reduction of silver and gold salts in water by a cathodic microplasma electrode

机译：阴极微血管电极减少银盐和金盐的比较研究

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摘要

A comparative study of the reduction of aqueous silver (Ag) and gold (Au) salts to colloidal Ag and Au nanoparticles, respectively, by a gaseous, cathodic, atmospheric-pressure microplasma electrode is presented. The resulting nanoparticles (NPs) were characterized by ultraviolet-visible (UV-vis) absorption spectroscopy and transmission electron microscopy (TEM), and the aqueous solution composition before and after experiments was determined by ionic conductivity, electrochemical potential, and/or UV-vis absorption measurements. TEM showed that Ag and Au NPs were spherical and non-agglomerated when synthesized in the presence of a stabilizer, polyvinyl alcohol. The charge injected by the plasma was correlated to the maximum intensity in the absorbance spectra which in turn depends on the nanoparticle concentration. Separately, the charge injected was correlated to the metal cation concentration. Ag and Au reduction rates were found to be directly proportional to the charge injected, independent of plasma current and process time. Differences in the mechanism for Ag and Au reduction were also observed, and solution species generated by the plasma and their role in the reduction process (e.g. H2O2, electrons) is discussed.
机译：提出了一种对胶体Ag和Au纳米颗粒的含银（Ag）和金（Au）盐的还原对胶体Ag和Au纳米颗粒的对比研究，分别通过气态，阴极，大气压导管电极。通过紫外线可见（UV-Vis）吸收光谱和透射电子显微镜（TEM）表征所得纳米颗粒（NPS），并且通过离子电导率，电化学电位和/或UV来确定实验前后的水溶液组合物可见吸收测量。 TEM显示Ag和Au nps在稳定剂，聚乙烯醇存在下合成时是球形和非聚集的。被等离子体注入的电荷与吸光光谱中的最大强度相关，这又取决于纳米颗粒浓度。另外，注入的电荷与金属阳离子浓度相关。发现AG和Au减少速率与注入的电荷成比例，与等离子体电流和处理时间无关。还观察到Ag和Au还原机制的差异，并讨论了血浆产生的溶液物种及其在还原过程中的作用（例如，H2O2，电子）。

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