催化学报

催化学报 ›› 2012, Vol. 33 ›› Issue (8): 1402-1409.DOI: 10.3724/SP.J.1088.2012.20429

• 研究论文 • 上一篇    下一篇

Fe2O3/TiO2 纳米管的制备及其光电催化降解染料废水性能

丛燕青*, 李哲, 张轶, 王齐, 徐谦, 伏芳霞   

  1. 浙江工商大学环境科学与工程学院, 浙江杭州 310012
  • 收稿日期:2012-04-16 修回日期:2012-05-29 出版日期:2012-08-01 发布日期:2012-08-01

Fabrication of Fe2O3/TiO2 Nanotube Electrode and Its Photoelectrocatalytic Performance in Dye Wastewater Degradation

CONG Yanqing*, LI Zhe, ZHANG Yi, WANG Qi, XU Qian, FU Fangxia   

  1. College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, Zhejiang, China
  • Received:2012-04-16 Revised:2012-05-29 Online:2012-08-01 Published:2012-08-01

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摘要： 采用阴极电沉积和阳极氧化法制备了 Fe2O3 改性 TiO2 纳米管 (Fe2O3/TiO2-NTs) 电极, 运用场发射扫描电子显微镜、透射电子显微镜、X 射线衍射和紫外-可见漫反射光谱等手段对其进行了表征, 考察了其光电化学性能, 并研究了复合电极光电催化降解甲基橙染料废水的反应性能. 结果表明, Fe2O3 的负载成功地将 TiO2-NTs 的光响应区间拓宽到可见光区域, Fe2O3/TiO2-NTs 复合电极的光电流密度达到 TiO2-NTs 电极的 3 倍. 在光电催化反应中, Fe2O3/TiO2-NTs 复合电极对甲基橙的脱色效果明显优于 TiO2-NTs 电极, 以 Fe2O3/TiO2-NTs 为阳极, 光照 5 min, 甲基橙溶液的脱色率可达 90% 以上.

关键词: 氧化铁, 二氧化钛, 纳米管, 光电催化, 可见光, 甲基橙, 降解

Abstract: The Fe2O3/TiO2 nanotubes electrode was prepared using cathodically electrochemical deposition and anodic oxidation method. The properties of the composite electrode were characterized by scanning electron microscopy, transmission electronic microscope, X-ray diffraction, and UV-Vis diffuse reflectance spectroscopy. The decolorization of methyl orange was investigated using the composite electrode as a photoanode. The results indicated that Fe2O3 nanoparticles were uniformly dispersed on the surface of TiO2 nanotubes electrode. The adsorption edge of the composite electrode exhibited a red shift compared with the pure TiO2 nanotubes electrode. In addition, Fe2O3/TiO2 nanotubes electrode showed higher current density than TiO2 nanotubes electrode under irradiation. It indicated that the metal oxide modification successfully broadened the absorption spectrum of TiO2 nanotubes to the visible light region. Moreover, it was in favor of the separation of photo-induced electron-hole pairs. The Fe2O3/TiO2 nanotubes electrode performed higher photoelectrocatalytic activity for the degradation of methyl orange. Furthermore, it was found that methyl orange had a higher decolorization rate under the acidic condition. When the initial pH value was 3, the decolorization rate of methyl orange solution could reach 91.7% under the light irradiation for 5 min.

Key words: ferric oxide, titania, nanotube, photoelectrocatalysis, visible light, methyl orange, degradation