软模板法合成纳米Cu2O及其光催化研究

采用不同分子量的聚乙二醇（PEG）形成不同大小的胶束为模板，在室温下碱性沉淀制备出多孔性的氧化亚铜纳米粒子。利用X射线衍射（XRD）和扫描电子显微镜（SEM）对合成产物的晶体结构和微观形貌进行表征，以甲基橙和刚果红的光催化降解为模型，评价了不同分子量聚乙二醇所制备氧化亚铜的光催化性能。结果表明，添加分子量35000的Cu2O对30 mg/L甲基橙催化降解效果最好，40 min达91.49%；添加分子量为200的Cu2O降解30 mg/L的刚果红30 min暗反应后，吸附降解率达95.11%；添加分子量35000的Cu2O循环使用4次降解率保持在94%以上。

Synthesis of Cu2O Nanoparticles by Using Soft-Template and Their Photocatalytic Properties

The porous cuprous oxide nanoparticles was prepared via precipitation with the micelles assembled by PEG of different average molecular as soft-template at room temperature. The nanoparticles were characterized using X-ray diffraction （XRD） and scan？ning electron microscopy （SEM）. The photocatalyst activity of Cu2O was evaluated through abundant degradation of methyl orange and Congo red solution. The results showed that the as-prepared Cu2O nanoparticles possessed a high ability of absorption and degradation. The Cu2O prepared with PEG of 35000 （MW） possessed the best result by degrading 30 mg/L MO and the degradation rate reached 91.49%after 40 minutes. The Cu2O prepared with PEG of 200 （MW） owned the best ability of degradation via degrading 30 mg/L Congo red and the degradation rate was up to 95.11%after 30 minutes. In addition, the degradation rate of Cu2O prepared with PEG of 35000 （MW） was still 94%after being reused four times.