pH对植物还原法制备钯颗粒形貌的影响

Influence of pH on the morphology of palladium particle produced with plant reduction

利用银杏叶提取液为还原剂,制备钯单质,考察了反应液不同pH对钯颗粒形貌的影响。首先,采用X射线衍射、透射电镜对制备的钯单质颗粒进行表征与分析,证明钯单质生成。其次,通过扫描电镜着重考察钯颗粒微米尺度的形貌情况。结果表明,改变反应液的pH可以调控钯颗粒的尺寸和形貌,生成的钯颗粒具有球状、线状、三角形等规则几何状形貌,并且pH为酸性时有利于制备线状钯颗粒,pH为碱性时有利于制备球状钯颗粒,pH为中性时有利于制备规则几何形状、尺寸较小的钯颗粒。

The effect of different pH value on the morphology of palladium particles was investigated by using Ginkgo biloba extract as reducing agent.Firstly,the prepared palladium simple particles were characterized by X-ray diffraction and transmission electron microscopy.Secondly,the morphology of particles was investigated by scanning electron microscopy.The results showed that the pH value of the reaction solution can control the size and morphology of particles.The results showed that the size and morphology can be controlled by changing the pH of the reaction solution.The formed palladium particles had spherical,linear,triangular and other regular geometric shapes.When the pH was acidic,it was advantageous to prepare linear particles.When the pH was alkaline,it was advantageous to prepare spherical particles.When the pH was neutral,it was advantageous to prepare regular shape and smaller size palladium particles.