海藻酸钠光化学还原法制备纳米银∗

摘要

Nano-silver was prepared by the reduction of AgNO3 under UV irradiation in the presence of sodium alginate as a reducer and stabilizer at room temperature.Nano-silver was characterized by UV-vis spectroscopy,X-ray diffraction (XRD),Fourier transform infrared spectroscopy (FTIR),transmission electron microscopy (TEM),bac-tericidal test,respectively.The effect of reaction conditions such as the UV irradiation time,the concentration of so-dium alginate and AgNO3 in the preparation of silver nanoparticles was studied.The best condition was that the con-centration of AgNO3 and sodium alginate was 1 mmol/L and 0.5%,the irradiation time was 2 h.The result showed that silver nanoparticles had spherical shape and narrow particle size distribution,the average size was about 1-5 nm. The synthesized silver nanoparticles had significant antibacterial activity on E .coli and S .aureus .%以海藻酸钠为还原剂和稳定剂,经紫外光照射 AgNO3溶液在室温下制备出纳米银。通过紫外吸收光谱(UV-Vis)、X 射线衍射(XRD)、红外光谱(FTIR)、透射电镜(TEM)、抑菌实验等对纳米银进行表征。结果表明,照射时间、海藻酸钠和 AgNO3浓度对纳米银生成均有影响。在 AgNO3浓度为1 mmol/L,海藻酸钠浓度为0.5%,反应时间为2 h 时能够生成理想的纳米银。此时生成的银纳米粒子为球形,粒径分布均匀,粒径大小在1~5 nm 之间,对大肠杆菌和金黄色葡萄球菌均有较强的抑菌性。