间接电还原法合成银纳米颗粒及纳米银粉的抗菌性能

Synthesis of Silver Nanoparticles via Indirect Electrochemical Reduction and Antibacterial Property

摘要:

利用Keggin结构的12-磷钨酸（PTA，下同）作为还原剂，采用间接电还原法还原硝酸银制备了银纳米颗粒，考察了12-磷钨酸与Ag+离子不同摩尔配比对Ag纳米颗粒大小的影响。用透射电子显微镜(TEM)、紫外可见吸收光谱(UV-vis)、X射线光电子能谱(XPS)、X射线衍射(XRD)等手段对制备的银纳米颗粒的形貌、组分、粒径和相结构进行了表征。测试了银纳米颗粒对大肠杆菌和金黄色葡萄球菌的抗菌性能，结果表明，制备的Ag纳米颗粒的平均粒径随磷钨酸和硝酸银的摩尔比的减小而增大。纳米银对大肠杆菌和金黄色葡萄球菌生长具有较好的抑制作用，且抗菌性能稳定。

Abstract:

Silver nanoparticles were synthesized by the reduction of silver ions through indirect electrochemical-reduction method using 12-phosphotungstic with Keggin structure as reductant. The effects of the molar ratio of phosphotungstic acid to silver ions on the silver nanoparticle sizes were investigated. The morphology, composition, particle size and phase structure of the silver nanoparticles were characterized by transmission electron microscopy (TEM), ultraviolet-visible spectroscopy (UV-vis), X-ray photoelectron spectra (XPS), and X-ray diffraction analysis (XRD). The antibacterial efficiency of silver nanoparticles was tested against E. coli and B. subtilis. The results show that the average size of silver nanoparticles increases with the decrease of the molar ratio of phosphotungstic acid to silver ions. The silver nanoparticles have good and steady antimicrobial property against E. coli and B. subtilis.