绿茶提取物制备纳米银

Preparation of Nano-silver with Green Tea Extract

纳米银做为零维纳米材料，具有独特的性能，已被广泛应用于各个领域。生物法制备纳米银绿色环保，对于建设生态环境友好型社会有积极的促进作用。国内暂时鲜有用植物还原银离子的相关报道。采用绿茶提取物作还原剂与硝酸银制备纳米银，不添加任何表面活性剂，制备出了纳米银。经XRD、SEM等表征，结果表明粒径约30～40mm，晶型为纯相面心立方晶系，银纳米粒子为球形，并无明显的团聚。通过正交试验设计确定了纳米银的最佳在制备条件为AgN03浓度0．08mol／L，绿茶提取物0．0125g／mL，反应温度为40℃，时间为2h。

As zero-dimensional nanomaterial, nano-silver has been widely used in various fields due to its unique properties. Preparation of nano-silver using biological method as an environmental friendly method can actively promote the construction of environment-friendly society.. However there are few reports on the study on reducing silver ions by using plants. Nano-silver was obtained through reducing AgNO3 by green tea extract without any surfactants, and the prepared nanometer silver powder prepared was characterized by scanning electron micrograph （SEM） and X-ray diffraction （XRD）. Results showed that the obtained nanometer silver powder was excellent with regular spherical shape and face- centered cubic （FCC） system with its grain diameter among 30-40nm The best preparation conditions were determined through the orthogonal test design as reaction temperature 4,0 C,AgNOa concentration 0.08 mol/L, concentration of green tea extract 0.012 5 g/mL for 2 h.