(1. 湖南科技大学 材料科学与工程学院，湘潭 411201；
2. 湖南科技大学 高温耐磨材料及制备技术湖南省国防科技重点实验室，湘潭 411201；
3. 湖南科技大学 精细聚合物可控制备及功能应用湖南省重点实验室，湘潭 411201；
4. 湖南科技大学 新能源储存与转换先进材料湖南省重点实验室，湘潭 411201)
摘 要: 以碳球为模板，采用溶剂热法合成了WO3/ZnO复合半导体材料。采用XRD、SEM、EDS对材料物相、形貌、成分和微结构进行了表征，并研究其对亚甲基蓝的降解。结果表明：所制备的WO3/ZnO半导体是由纳米颗粒自组装而成，具有中空结构；相对于纯相的单个组分ZnO，WO3/ZnO异质结复合材料的吸收谱峰明显地向长波区红移，对亚甲基蓝的最大吸收波长为664 nm，其禁带宽度为3.64 eV；在40 min内使10 mg/L亚甲基蓝的浓度降低了90%，60 min后完全降解，并具有良好的循环稳定性。WO3/ZnO复合光催化剂降解过程符合一级反应动力学，其反应速率常数ka=5.58×10-2 h-1。降解机理研究表明，WO3和ZnO之间满足能级匹配条件，能形成n-n型WO3/ZnO异质结，可以有效促使材料的载流子迁移和光生电子-空穴对的分离，从而提高材料的光催化性能。
关键字: WO3/ZnO；中空球；纳米颗粒；复合半导体；光催化
（1. School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan 411201, China;
2. Hunan Provincial Key Defense Laboratory of High Temperature Wear-resisting Materials and Preparation Technology, Hunan University of Science and Technology, Xiangtan 411201, China;
3. Hunan Provincial Key Laboratory of Controllable Preparation and Functional Application of Fine Polymers, Hunan University of Science and Technology, Xiangtan 411201, China;
4. Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and Conversion,
Hunan University of Science and Technology, Xiangtan 411201, China）
Abstract:ZnO/WO3 compound semiconductor photocatalysts were prepared with carbon spheres as templates, zinc acetate and sodium tungstate as reaction source. The phase, morphology, composition and microstructure of the products were characterized by XRD, SEM and EDS technique. The results show that n-WO3/n-ZnO composite has red shift of a strong absorption peak at 664 nm on methylene blue (MB) with the band gap of 3.64 eV. The degradation rate of n-WO3/n-ZnO composite on 10 mg/L methylene blue solution reaches 90% in 40 min and the degradation finishes completely after 60 min. The WO3/ZnO composite photocatalyst shows excellent cycle stability. The degradation process confirms to the one-order kinetic model and ka=5.58×10-2 h-1. The research result on the mechanism of degradation of WO3/ZnO composite shows that the energy level matching between WO3 and ZnO can form n-n heterojunction and benefit to enhance photocatalytic performance of WO3/ZnO composite due to improving electron mobility and photo generated electron-hole pairs separation.
Key words: WO3/ZnO; hollow microsphere; nanoparticle; compound-semiconductor; photocatalyst
