催化学报

催化学报 ›› 2009, Vol. 30 ›› Issue (11): 1137-1142.

• 研究论文 • 上一篇    下一篇

微弧氧化法制备WO3/TiO2复合薄膜的结构及光催化性能

何剑 1, 蔡启舟 1, 肖枫 2, 罗强 1, 王丽娟 1, 祝迪 1   

  1. 1 华中科技大学材料成形与模具技术国家重点实验室, 湖北武汉 430074 2 华中科技大学文华学院, 湖北武汉 430074
  • 收稿日期:2009-11-25 出版日期:2009-11-25 发布日期:2013-07-17

Structure and Photocatalytic Properties of WO3/TiO2 Composite Film by Mi-croarc Oxidation

HE Jian1, CAI Qizhou1,*, XIAO Feng2, LUO Qiang1, WANG Lijuan1, ZHU Di1   

  1. 1State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China 2Wenhua College, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China
  • Received:2009-11-25 Online:2009-11-25 Published:2013-07-17

PDF

1122

摘要： 采用微弧氧化工艺分别在钨酸盐和磷酸盐电解液中制备了 WO3/TiO2 复合薄膜和单一的 TiO2 膜 (P-TiO2), 利用 X 射线衍射、扫描电子显微镜、紫外-可见光谱和荧光光谱对这两种膜层的结构及光物理特性进行了表征. 结果表明, P-TiO2 膜由锐钛矿与金红石混合相组成, 而 WO3/TiO2 膜中除锐钛矿与金红石混合相外, 还含有 WO3 相. 两种膜层表面粗糙多孔, WO3/TiO2 膜的孔洞数量更多, 分布更均匀. WO3/TiO2 膜的光吸收范围较 P-TiO2 膜略宽, 但后者在紫外光区的光吸收性能更好. WO3/TiO2 膜的荧光发光强度比 P-TiO2 的小, 光生电子-空穴之间的分离效果好. 与 P-TiO2 膜相比, WO3/TiO2 膜的表面酸度高, 吸附有机物和羟基的能力更强. 紫外光下照射 2 h, WO3/TiO2 能够降解 85% 罗丹明, 而 P-TiO2 膜只能降解 23%. WO3/TiO2 膜的高光催化活性源于它较高的比表面积、较优的电子-空穴分离效果和较高的表面酸度.

关键词: 钨, 钛, 微弧氧化, 电解液, 二氧化钛膜, 光催化

Abstract: A WO3/TiO2 composite film and a pure TiO2 film were prepared by microarc oxidation in tungsten electrolyte and phosphate electrolyte, respectively. The structure and photophysical properties of the two films were characterized by X-ray diffraction, scanning electron microscopy, UV-Vis spectroscopy, and photoluminescence. The results showed that the two films consisted of a mixture of anatase and rutile, but the ratio of anatase to rutile was different. In addition, WO3 was present in the WO3/TiO2 composite film. The two films had porous structure, but more pores distributed homegeneously on the WO3/TiO2 composite film surface than on the TiO2 film. The WO3/TiO2 composite film showed wider absorption rang while the TiO2 film presented better optical absorption in the UV region. The photoluminescence intensity of the WO3/TiO2 composite film was lower than that of the TiO2 film, which meant that the recombination of photo-generated electrons and holes in the former was less than that in the later. Compared to the TiO2 film, the WO3/TiO2 composite film had higher surface acidity, which increased the adsorption of organics and OH groups on the film surface. More than 85% of rhodanmine was removed by the WO3/TiO2 composite film, whereas only 23% of rhodamine was removed by the TiO2 film for 2 h. The higher photocatalytic removal ratio of the WO3/TiO2 composite film was ascribed to the larger specific surface area, better separation between electrons and holes, and higher surface acidity.

Key words: tungsten, titanium, microarc oxidation, electrolyte, titania film, photocatalysis