Preparation of Nano-silver with Green Tea Extract
As zero-dimensional nanomaterial,nano-si1ver has been widely used in various fields due to its unique properties. Preparation of nano-si1ver 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 si1ver ions by using plants. Nano-si1ver was obtained through reducing AgNO3 by green tea extract without any surfactants,and the prepared nanometer si1ver 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 facecentered cubic(FCC) system with its grain diameter among 30 ~40nm The best preparation conditions were determined through the orthogonal test design as reaction temperature 40 ℃,AgNO3 concentration 0.08 mol/L,concentration of green tea extract 0.012 5 g/mL for 2 h.