Citation: ZOU Xiaomei, CHEN Yan, ZHU Xingwang, LIU Gaopeng, GUO Xinwei, LEI Qin, KE Xiaoxue, LI Shuaixing, HUA Yingjie, WANG Chongtai. Preparation of the Keggin Type Chromium Substituted Phosphotungstates/Titanium Dioxide Nano Film and Its Visible Photocatalytic Performance[J]. Chinese Journal of Applied Chemistry, ;2016, 33(3): 320-329. doi: 10.11944/j.issn.1000-0518.2016.03.150258 shu

Preparation of the Keggin Type Chromium Substituted Phosphotungstates/Titanium Dioxide Nano Film and Its Visible Photocatalytic Performance

1.
School of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, China

Corresponding author: HUA Yingjie, WANG Chongtai,
Received Date: 21 July 2015
Available Online: 28 September 2015
Fund Project:

A PW₁₁Cr/TiO₂ nano film photocatalyst was prepared on the surface of a glass slide via the sol-gel dipping pulling method using tetrabutyl titanate Ti(OC₄H₉)₄ as the precursor of TiO₂ and the Keggin type chromium substituted heteropolyanion(PW₁₁Cr) as the visible light active component. Then the light absorption properties, chemical composition, crystal phase and surface morphology of the as-prepared catalyst were characterized using solid ultraviolet-visible diffuse reflection spectroscopy, infrared spectroscopy, X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The interaction between PW₁₁Cr and TiO₂ in the film was discussed. Visible photocatalytic activity of the catalyst was assessed using photocatalytic degradation of RhB as a probe. Meanwhile, a photocatalysis mechanism was suggested and compared with that of TiO₂. Influences of the calcination temperature, the PW₁₁Cr dosage and the solution pH on the catalyst activity were also examined. In the end, a recycle test of the catalyst for RhB degradation was employed to evaluate the stability of the catalyst. The PW₁₁Cr/TiO₂ photocatalyst has a good absorption of visible light. The film obtained at low calcination temperature(100℃) is amorphous but crystal at high calcination temperature(500℃). The former has higher photocatalytic activity, and is employed to degrade RhB with a concentration of 10 μmol/L under the irradiation of 200 W metal halide lamp. The degradation ratio is 95% at 120 min and the COD removal is 72% at 4 h. The hydroxyl radicals are the main reactive oxygen species leading to RhB degradation. Low processing temperature, high PW₁₁Cr dosage and high solution acidity are favorable to enhance the photocatalytic activity of the PW₁₁Cr/TiO₂ film. After recycles of 10 times for RhB degradaion, the photocatalytic activity of the PW₁₁Cr/TiO₂ film lose insignificantly.
- Keggin-type Cr-substituted phosphotungstates,
- titanium dioxide,
- visible photocatalyst,
- sol-gel method,
- rhodamine B
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