微波水热制备Cu_2O/Cu可见光响应催化剂及性能研究

Hydrothermal preparation and characterization of Cu_2O/Cu photocatalyst with the visible light excitation

以铜粉为基材,利用微波水热合成技术,制备得到了壳/核结构的Cu2O/Cu可见光响应光敏催化剂颗粒.扫描电镜(SEM)和透射电镜(TEM)分析表明,催化剂颗粒的粒径为4～11μm,颗分布均匀.X射线衍射(XRD)结果证实,Cu2O的晶体结构为等轴晶相.X射线荧光光谱(XRF)分析得到,铜、氧原子符合化学计量比.紫外可见漫反射光谱(UV-Vis)分析表明,Cu2O/Cu的吸收光主要集中在400～700nm的可见光段.激光拉曼(LaserRam)光谱分析表明,Cu2O/Cu表面为单一的Cu2O组分.该催化剂对直接大红4BE染料水溶液降解表现出更高的催化活性.在Cu2O/Cu壳核结构中,半导体Cu2O与金属Cu构成的表面势垒结构可以强化光生电子-空穴对的分离.

Cu2O/Cu photo-sensitizer catalyst with shell-core structure has been prepared by taking bronze powder as raw matrix via hydrothermal route.The results from Scan Electron Microscope（SEM）and Transmission Electron Microscope（TEM）indicated that the size of particles ranged from 4μm to 11μm,and the distribution of particle size was narrow.The results from X-ray Diffusion（XRD）indicated that the Cu2O in the particles was assigned to the isometric crystal phase.X-ray Florescence specera（XRF）verified that the molar ratio of copper to oxygen abided by stoichiometry.The Ultraviolet Visible Diffuse Reflectance Spectra（UV-Vis）showed that the absorption spectra of these photocatalysts centered at the visible band of 400～700nm.The Laser Raman Microscope indicated further that the compound on the surface of Cu2O/Cu particles belonged to the onefold cuprous oxide.In the presence of the prepared Cu2O/Cu particles,the degradation of 4BE aqueous exhibited higher efficiency.This performance could be attributed to the schottky barrier effect occured in Cu2O/Cu with shell-core structure.