银纳米粒子制备与表征实验的绿色化改进及教学设计

Green Improvement and Educational Design in the Synthesis and Characterization of Silver Nanoparticles

绿色改进了银纳米粒子制备和表征的实验。以茶叶水为还原剂和稳定剂,考查了茶叶水的含量、溶液的pH值和反应温度对银纳米粒子制备的影响,让学生理解实验条件对银纳米粒子制备产生的影响。利用分光光度计表征了银纳米粒子的光学性质,验证了银纳米粒子溶液吸光度与浓度的关系及丁达尔现象,并利用激光粒度分析仪测定了其粒径。本实验贴近生活、内容丰富、紧跟前沿且符合绿色化学理念,有利于激发学生学习兴趣和培养实践技能、思辨能力和创新意识。

An eco-friendly modification has been implemented in the experiment of preparation and characterization of silver nanoparticles.Using tea water as both reducing agent and stabilizer,the study explored the effects of tea water concentration,pH of solution,and reaction temperature on the preparation of silver nanoparticles,thereby helping students to understand the effects of experimental conditions on the preparation of silver nanoparticles.The optical properties of silver nanoparticles were characterized by a spectrophotometer.And the relationship between absorbance and concentration of silver nanoparticle solution and Tyndall effect were demonstrated.Furthermore,the size of silver nanoparticles was determined using a laser particle size analyzer.The improved experiment is closely aligned with everyday life,rich in content,and closely following academic frontier.It also adheres to the principles of green chemistry,making it advantageous for stimulating students’interest in learning and cultivating practical skills,critical thinking ability and innovative awareness.