明胶水溶液中银离子的光还原

Photoreduction of Silver Ions in Gelatin Aqueous Solution

利用紫外线辐射ＡｇＮＯ３明胶（ＣＨ３）２ＣＨＯＨ 水溶液制备了银纳米颗粒，并用吸收光谱和透射电镜跟踪研究了其形成过程．发现增大明胶和银离子浓度可以加速银颗粒的生成，其粒径随明胶浓度增大而减小，银颗粒的光还原过程属于准一级反应；明胶保护下的银纳米颗粒具有很高的稳定性．提出了ＡｇＮＯ３明胶（ＣＨ３）２ＣＨＯＨ水溶液中Ａｇ ＋

The silver nanoparticles was prepared by illuminating AgNO 3 gelatin (CH 3) 2CHOH aqueous solution and its formation process was studied by means of UV-vis absorption spectra and transmission election micrographs.The process of the of the Ag + photoreduction follows guise first order reaction.Increasing the concentrations of gelatin and silver ions both enhance the formation of silver nanoparticles.And the gelatin concentration increasing lead to the decreasing of the particle sizes;Gelatin has a strong stabilizing capacity towards silver nanoparticles.The mechanisms of the Ag + photoredution in AgNO 3 gelation (CH 3) 2CHOH aqueous solution and the stabilizing of gelatin towards silver nanoparticles was proposed