Corrosion Protection Division, Central Electrochemical Research Institute (CSIR), Karaikudi, India.
Bioprocess Biosyst Eng. 2012 Jun;35(5):827-33. doi: 10.1007/s00449-011-0666-0. Epub 2011 Dec 14.
The leaf extract of Ocimum sanctum was used as a reducing agent for the synthesis of platinum nanoparticles from an aqueous chloroplatinic acid (H(2)PtCl(6)·6H(2)O). A greater conversion of platinum ions to nanoparticles was achieved by employing a tulsi leaf broth with a reaction temperature of 100 °C. Energy-dispersive absorption X-ray spectroscopy confirmed the platinum particles as major constituent in the reduction process. It is evident from scanning electron microscopy that the reduced platinum particles were found as aggregates with irregular shape. Fourier-transform infrared spectroscopy revealed that the compounds such as ascorbic acid, gallic acid, terpenoids, certain proteins and amino acids act as reducing agents for platinum ions reduction. X-ray diffraction spectroscopy suggested the associated forms of platinum with other molecules and the average particle size of platinum nanoparticle was 23 nm, calculated using Scherer equation. The reduced platinum showed similar hydrogen evolution potential and catalytic activity like pure platinum using linear scan voltammetry. This environmentally friendly method of biological platinum nanoparticles production increases the rates of synthesis faster which can potentially be used in water electrolysis applications.
罗勒叶提取物被用作还原试剂，从氯铂酸（H(2)PtCl(6)·6H(2)O）水溶液中合成铂纳米粒子。通过在 100°C 的罗勒叶肉汤中反应，可以实现更多的铂离子转化为纳米粒子。能谱分析确认了铂颗粒是还原过程中的主要成分。扫描电子显微镜表明，还原后的铂颗粒呈不规则形状的聚集状态。傅里叶变换红外光谱表明，抗坏血酸、没食子酸、萜类化合物、某些蛋白质和氨基酸等化合物可作为铂离子还原的还原剂。X 射线衍射光谱表明，铂与其他分子的结合形式以及使用谢乐方程计算得出的铂纳米粒子的平均粒径为 23nm。使用线性扫描伏安法，还原后的铂显示出与纯铂相似的析氢电位和催化活性。这种环保的生物铂纳米粒子生产方法可以提高合成速率，有望应用于水电解应用。
