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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。
The use of Keggin structure of 12-phosphotungstic acid (PTA, the same below) as a reducing agent, the use of indirect reduction silver nitrate silver nanoparticles were prepared silver nanoparticles were investigated 12-phosphotungstic acid and Ag + ion molar ratio of Ag nano Effect of particle size. The morphology, composition and particle size of the prepared silver nanoparticles were characterized by transmission electron microscopy (TEM), UV-vis, X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) And phase structure were characterized. The antibacterial properties of silver nanoparticles against Escherichia coli and Staphylococcus aureus were tested. The results showed that the average particle size of Ag nanoparticles increased with the decrease of the molar ratio of phosphotungstic acid to silver nitrate. Nano-silver has a good inhibitory effect on the growth of Escherichia coli and Staphylococcus aureus, and the antibacterial property is stable.