Citation: QIU Wei, REN Cheng-Jun, NG Mao-Chu, HOU Yun-Ze, CHEN Yao-Qiang. Structure, Surface Properties and Photocatalytic Activity of TiO₂ and TiO₂/SiO₂ Catalysts Prepared at Different pH Values[J]. Acta Physico-Chimica Sinica, ;2011, 27(06): 1487-1492. doi: 10.3866/PKU.WHXB20110621 shu

Structure, Surface Properties and Photocatalytic Activity of TiO₂ and TiO₂/SiO₂ Catalysts Prepared at Different pH Values

1.
Key Laboratory of Green Chemistry & Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China

Received Date: 25 February 2011
Available Online: 4 May 2011

TiO₂ and SiO₂-doped TiO₂ (TiO₂/SiO₂) catalysts were prepared using aqueous solutions containing a TiOSO₄ and/or SiO₂ sol in which NH₃·H₂O was used to adjust the pH value by a precipitation method. The as-synthesized photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), N₂ adsorption (BET), UV-Vis diffuse reflectance spectroscopy, NH₃ temperature programmed desorption (NH₃-TPD), and Fourier transform infrared (FT-IR) spectroscopy. The XRD patterns showed that anatase and rutile coexisted in the as-prepared TiO₂ and the rutile phase content increased with the increase in pH value. However, only anatase-TiO₂ was observed in the TiO₂/SiO₂ catalysts. SEM revealed that the surface morphology of the particles was a sub-spherical shape and some agglomeration occurred on the surface while the particle size was mostly between 10 and 25 nm. Surface area measurements showed that the surface areas of the catalysts increased slightly with the increase in pH value. The incorporation of SiO₂ increased the surface area. NH₃-TPD analysis indicated that the amount of surface acid increased as the pH increased. The amount of surface acid on SiO₂-doped TiO₂ was higher than that on TiO₂ when they were prepared at identical pH values. The addition of silica and the high pH value environment led to more surface hydroxyl groups on the catalysts as determined by FT-IR spectroscopy. The photocatalytic activity of the catalysts improved remarkably with the increase in pH value. The photocatalytic activity of SiO₂-doped TiO₂ is better than that of TiO₂. The TiO₂/SiO₂ catalyst has better durability.
- pH,
- TiO₂,
- SiO₂-doping,
- Microstructure,
- Surface property,
- Photocatalysis
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Structure, Surface Properties and Photocatalytic Activity of TiO2 and TiO2/SiO2 Catalysts Prepared at Different pH Values

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通讯作者: 陈斌, bchen63@163.com

Structure, Surface Properties and Photocatalytic Activity of TiO₂ and TiO₂/SiO₂ Catalysts Prepared at Different pH Values