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.
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