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.
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