Photocatalytic Performance of N-Doped TiO2 Adsorbed with Fe3+ Ions under Visible Light by a Redox Treatment
详细信息 查看全文
- 作者：Mingyang Xing ; Jinlong Zhang ; Feng Chen
- 刊名：Journal of Physical Chemistry C
- 出版年：2009
- 出版时间：July 23, 2009
- 年：2009
- 卷：113
- 期：29
- 页码：12848-12853
- 全文大小：263K
- 年卷期：v.113,no.29(July 23, 2009)
- ISSN：1932-7455
文摘
A simple method to prepare the N−TiO2 adsorbed with Fe3+ ions only on the surface of catalysts and modify the catalysts by a redox treatment (NaBH4 reduction and air oxidation treatment) was proposed. The samples were characterized by X-ray diffraction (XRD), UV−vis diffuse reflectance spectroscopy, FTIR, X-ray photoelectron spectroscopy (XPS), and high-resolution transmission electron micrograph (HRTEM). The photocatalytic activities of the samples were evaluated for degradation of methylene blue (MB) in aqueous solutions under visible light (λ > 420 nm). The results of XRD, FTIR, XPS, and HRTEM analysis indicated that the structure of Fe compounds changed from Fe2O3 to γ-FeOOH after redox treatment. Compared to N−TiO2 with Fe3+ ions, the catalysts after redox treatment showed higher photoactivity under visible light, and the formation of γ-FeOOH was responsible for the improvement of photocatalytic activity. Furthermore, to the catalysts after redox treatment, the mechanism for degradation of MB under visible light is an opening of a central aromatic ring attacked by OH• combined with a process of γ-FeOOH photoreductive dissolution.