纳米银的绿色合成:丝胶蛋白作为还原剂和分散剂

摘要

利用基于天然生物高分子的绿色环保法制备纳米贵金属材料是当今纳米技术发展的一个重要方向之一.利用丝胶蛋白(SS)为还原剂和分散剂合成了纳米银颗粒,利用紫外-可见(UV-Vis)光谱、X射线衍射(XRD)、透射电镜(TEM)等研究了反应温度、pH值、SS/Ag+物质的量比对反应速率和合成的纳米银粒子形貌的影响.实验结果表明,利用本方法可以合成尺寸均匀且分散性良好的球形纳米银粒子,且随着反应温度和溶液pH值的逐渐升高,反应速率随之加快,合成的纳米银粒子的粒径逐渐变小,而SS/Ag+物质的量比的变化主要对纳米银粒子的尺寸有影响.%Recently, it is one of the important research fields to develop the green synthesis method for the noble metal nanoparticles with natural biopolymers. In this paper, we reported a facile synthesis of silver nanoparticles by using silk sericin (SS) as a reductant and dispersant. The effect of reaction conditions like temperature, pH value, and SS/Ag+ molar ratio on the Ag nanoparticle formation was investigated using UV-Vis spectrophotometer, X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results showed that the homogeneous and mono-dispersed Ag nanoparticles could be obtained. Moreover, the increase of pH value and reaction temperature could accelerate the Ag+ reduction rate with the decrease of particle size while the SS/Ag+ molar ratio would only affect the nanoparticle size.