Citation: JIANG Jing-Jing, LONG Ming-Ce, WU De-Yong, CAI Wei-Min. Preparation of F-Modified Nanosized TiO₂ and Its Methyl Orange Photodegradation Mechanism[J]. Acta Physico-Chimica Sinica, ;2011, 27(05): 1149-1156. doi: 10.3866/PKU.WHXB20110520 shu

Preparation of F-Modified Nanosized TiO₂ and Its Methyl Orange Photodegradation Mechanism

1.
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China

Received Date: 20 October 2010
Available Online: 8 April 2011
Fund Project: 高等学校博士学科点专项科研基金新教师基金(20090073120042)资助项目 (20090073120042)

Fluorine-modified nanosized TiO₂ (F-TiO₂) was prepared by a facile precipitation-fluorination- reflux method. Characterizations of transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and diffuse reflectance spectroscopy (DRS) were carried out to investigate various properties of the as-prepared F-TiO₂ powder. We found that the F-TiO₂ particles were small (5-8 nm) and ellipsoidal in shape. The presence of fluorine not only suppressed the formation of a brookite phase, but also improved the crystallinity of the anatase phase. The fluorine atoms were mainly distributed on the surface of TiO₂, and existed in both forms of chemical-adsorption and interstitial-doping. Compared to pure titania, the fluorine-modified TiO₂ powder showed a much higher methyl orange (MO) degradation efficiency under UV light and under visible light. Through the experiments of alkaline washing and heat treatment, we found that the increased MO degradation rate under visible light irradiation was caused by the enhanced self- degradation of the dye over the surface-modified TiO₂.
- Fluorine-modification,
- Titanium dioxide,
- Reflux,
- Visible-light activity,
- Dye sensitization
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沈阳化工大学材料科学与工程学院沈阳 110142

Preparation of F-Modified Nanosized TiO2 and Its Methyl Orange Photodegradation Mechanism

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通讯作者: 陈斌, bchen63@163.com

Preparation of F-Modified Nanosized TiO₂ and Its Methyl Orange Photodegradation Mechanism