ZnO空心微球的制备及光催化性能研究

通过二水醋酸锌与吡啶200℃溶剂热反应24h制备出ZnO空心微球。采用X射线衍射仪(XRD)和扫描电子显微镜(SEM)对所制备样品进行了表征。ZnO空心微球形成机理主要遵循Ostwald老化机理。在室温下研究了ZnO空心微球的光催化性能。实验结果表明ZnO空心微球是光降解酸性大红的有效催化剂,其催化过程为准一级反应。

亚微级氧化锌空心球的制备及其光催化性能研究进展

亚微级ZnO空心球由于具有密度低、比表面积大、结构规整、尺寸可控等优点及众多优异的物理化学性能,引起科研工作者的广泛关注。因此,探索简单易行、经济高效的亚微级ZnO空心球的制备方法成为关注的热点。结合课题组在亚微级ZnO空心球方面的研究进展和国内外在其制备过程中涌现出的新方法,如水热法、声化学法、超声辅助水热法、静电纺丝法和微波辐射法等,对中空ZnO的制备新技术进行了综述。同时,对这些方法的基本原理、特点、应用情况等进行了总结,并对中空ZnO的光催化性能进行了综述。最后,在此基础上对亚微级ZnO空心球的发展方向和前景进行了展望。

Step-scheme ZnO@ZnS hollow microspheres for improved photocatalytic H_(2) production performance

Constructing a step-scheme heterojunction at the interface between two semiconductors is an efficient way to optimize the redox ability and accelerate the charge carrier separation of a photocatalytic system for achieving high photocatalytic performance.In this study,we prepared a hierarchical ZnO@ZnS step-scheme photocatalyst by incorporating ZnS into the outer shell of hollow ZnO microspheres via a simple in situ sulfidation strategy.The ZnO@ZnS step-scheme photocatalysts had a large surface area,high light utilization capacity,and superior separation efficiency for photogenerated charge carriers.In addition,the material simulation revealed that the formation of the step-scheme heterojunction between ZnO and ZnS was due to the presence of the built-in electric field.Our study paves the way for design of high-performance photocatalysts for H_(2) production.