形态可控合成氧化亚铜粉体及其光催化性能

Shape-Controlled Synthesis and Photocatalytic Properties of Cu_2O Powder

采用水热法成功可控合成了球形和立方氧化亚铜粉体。研究表明,在其它实验条件相同时,还原剂(酒石酸)和模板(明胶)的用量对产物的形态控制起到了关键的作用。当酒石酸使用量为0. 005 mol时,将得到较规整的立方形Cu_2O粉体,而在该体系中添加1. 0 g明胶后,将获得球形的Cu_2O粉体。两种形态的Cu_2O粉体最大吸收波长均为500 nm左右(带隙约为2. 2 e V)。可见光催化实验结果表明,球形Cu_2O粉体的光催化性能要优于立方Cu_2O粉体。进一步分析研究得出,两者去除水中甲基橙染料的动力学模型均符合一阶动力学模型。

Cuprous oxide(Cu 2O) powders exhibiting cubic and spherical morphologies were synthesized via a facile hydrothermal method. Results indicated that contents of tartaric acid(TA) and gelatin played vital roles in controlling morphologies.Cubic Cu 2O powders would be obtained when the amount of tartaric acid was 0.005 mol. And spherical Cu 2O powders would be acquired when 1.0 g gelatin was used in the above reaction system. It was observed that the maximium absorption wavenumber for cubic and spherical Cu 2O powders was about 500 nm( E g ≈2.2 eV). Photocatalytic testing results showed that the catalytic property of prepared sphericial Cu 2O powders had advantage over that of cubic Cu 2O powders. The catalytic kinetic model of degradation of methyl orange in water well accorded with the first-order dynamic equation.