Citation: Liu Shengwei, Zhao Jianjun, Xu Yiming. Larger Adsorption Effect of Fluoride than Phosphate on Phenol Degradation over the Irradiated Anatase TiO₂ and Pt/TiO₂[J]. Acta Chimica Sinica, ;2019, 77(4): 351-357. doi: 10.6023/A19010009 shu

Larger Adsorption Effect of Fluoride than Phosphate on Phenol Degradation over the Irradiated Anatase TiO₂ and Pt/TiO₂

Department of Chemistry and State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027

Corresponding author: Xu Yiming, xuym@zju.edu.cn
Received Date: 4 January 2019
Available Online: 5 April 2019
Fund Project: the Funds for Creative Research Group of NSFC 21621005Project supported by the Funds for Creative Research Group of NSFC (No. 21621005)

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It is known that fluoride and phosphate in aqueous solution can accelerate the photocatalytic degradation of phenol over anatase or P25 TiO₂. But the mechanism still remains under debate. In this work, an anion-free anatase TiO₂ is prepared, followed by deposition with 0.52 wt% Pt (Pt/TiO₂). Reaction was performed in aqueous solution at initial pH 5.2, where 99% of anions were in the form of F^- or H₂PO₄^-. On the addition of 0.1~30 mmol/L anions, the rate constants of phenol degradation (k_obs) were all increased, confirming the positive effect of fluoride and phosphate, respectively. Interestingly, there was a linear relationship between the increase of k_obs and the amounts of anion adsorption, the slope of which became larger in the order of fluoride>phosphate, and Pt/TiO₂>TiO₂. These observations indicate that the positive effect of anions originates from the adsorbed anions on solid, and that fluoride was more active than phosphate. A (photo)electrochemical measurement showed that fluoride and phosphate were negative and positive, respectively, to O₂ reduction, but they were all beneficial to phenol oxidation. Furthermore, in the presence of fluoride and phosphate, the flat band potentials of TiO₂ were shifted by -159 and 89 mV, respectively. The former favors orbital overlapping of phenol with TiO₂ valence band, and the latter favors orbital overlapping of O₂ with TiO₂ conduction band, all of which promotes the interfacial charge transfers. Since inorganic anions are widely present, this result would benefit the mechanism study of a semiconductor photocatalyis and its application. As a reference, pure anatase was prepared from the hydrolysis of tetrabutyl titanate, followed by calcination in air at 400℃ for 2 h. The solid was then deposited with Pt, produced in situ from the photocatalytic reduction of H₂PtCl₆ in the presence of methanol. Solid was characterized with X-ray diffraction, N₂ adsorption, Raman, and X-ray photoelectron spectroscopy. After Pt deposition, anatase phase remained unchanged, but the solid pores were blocked by a mixture of Pt and PtO₂. Photoreactions were performed at room temperature under UV light at wavelengths equal to and longer than 320 nm. Organic compounds and inorganic anions were quantitatively analyzed with a high performance liquid and ionic chromatography, respectively. (Photo)electrochemical measurement was performed in a three-electrode compartment, where a Pt gauze was used as counter electrode, and a AgCl/Ag as reference electrode.
- anatase TiO₂,
- fluoride,
- phosphate,
- adsorption,
- photoelectrocatalysis,
- charge transfer
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沈阳化工大学材料科学与工程学院沈阳 110142

Larger Adsorption Effect of Fluoride than Phosphate on Phenol Degradation over the Irradiated Anatase TiO2 and Pt/TiO2

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通讯作者: 陈斌, bchen63@163.com

Larger Adsorption Effect of Fluoride than Phosphate on Phenol Degradation over the Irradiated Anatase TiO₂ and Pt/TiO₂