花状Cu_2O/Cu的水热合成及其光催化性能

Hydrothermal Preparation and Visible Photocatalytic Activity of Flower-Like Cu_2O/Cu Nanocomposites

以硝酸铜为前驱体,不采用任何模板,通过逐步水热法合成了花状Cu2O/Cu复合纳米材料.用扫描电镜(SEM)、X射线衍射(XRD)和紫外-可见漫反射光谱(DRS)对样品进行表征.结果表明,花状纳米Cu2O/Cu材料是由长为300-500nm,宽为30-70nm的带状花瓣构成,在可见光区域有很强的吸收.复合材料中Cu的含量可以通过反应时间进行调控.对染料Procion Red MX-5B(PR)的可见光催化降解,Cu能明显提高Cu2O的光催化性能.当Cu质量分数为27%-71%时,复合材料Cu2O/Cu的催化活性明显高于单相Cu2O.与立方体形貌的Cu2O/Cu复合材料相比,花状纳米Cu2O/Cu复合材料对染料PR有更高的催化降解性能.且该复合材料有较高的循环回收利用率.

Novel Cu2O/Cu nanocomposites with a flower-like nanoarchitecture were prepared by a facile templatefree two-step hydrothermal synthesis route using Cu（NO3）2·3H20 as a precursor. Their properties were characterized by X-ray diffraction （XRD）, UV-Vis diffuse reflection spectroscopy （DRS）, and scanning electron microscopy （SEM）. The flower-like CuzO/Cu nanocomposites consist of many nanopetals with lengths of 300-500 nm and widths of 30-70 nm. They show strong absorption for visible light. The content of Cu in the composites could be easily controlled by adjusting the hydrothermal time. As photocatalysts, the composites exhibit much higher photocatalytic activity than Cu2O for the photodegradation of Procion Red MX-5B （PR） under visible light illumination when the mass fraction of Cu lies between 27% and 71%. Moreover, flower-like Cu2O/Cu nanocomposites show better performance for the photodegradation of PR than cubic composites. The synthesized composites can also be recycled for further use.