可见光催化剂Ag/Ag2O制备及其对染料脱色降解

Preparation of Visible-Light Photocatalyst Ag/Ag2O and Its Degradation Performance for Dyes

介绍了一个简单易行的综合化学实验——Ag／Ag2O可见光催化剂的制备及其对染料的脱色降解，以及其教学设计思路。通过液相沉淀法制备Ag2O,光还原沉积银制备Ag／Ag2O,借助场发射扫描电子显微镜（FESEM）、X射线衍射（XRD）对催化剂进行表征，并以甲基橙降解为模型反应研究其可见光催化降解性能。结果显示，Ag／Ag2O具有优异的可见光光催化性能。该综合实验运用了大学化学基本知识及学生在基础化学实验阶段学习的材料合成、仪器分析等基本技能，将前沿学术发展、最新研究成果和实践技能融入实验教学，使学生了解化学与材料、环境等学科交叉融合的同时，学生的综合能力得到训练，有助于培养学生的创新思维和分析问题、解决问题的能力。

The synthesis of visible-light photocatalyst Ag/Ag2O and its photocatalytic degra- dation performance for dye have been designed as an excellent comprehensive chemical experiment and its corresponding teaching plan was carefully introduced. Ag/Ag2O photocatalyst was pre- pared by a direct precipitation method to form Ag2O and then metallic Ag was in situ produced on the Ag2O surface under light irradiation owing to its self-decomposition property. The photocata- lyst was characterized by field emission scanning electron microscopy （FESEM） and X-ray diffrac- tion （XRD）, and the decolorization experiment of methyl orange （MO） solution was employed to characterize the photocatalytic performance of Ag/Ag2O photocatalyst. The results showed that Ag/Ag2O photocatalyst exhibited excellent visible-light photocatalytic activity. The present ex- periment includes the basic knowledge of college chemistry and basic skills such as material syn- thesis and instrumental analysis, which is very important and necessary for students to improve their academic knowledge, innovative thinking and problem-solving skills.