Preparation of nano-TiO2/diatomite-based porous ceramics and their photocatalytic kinetics for formaldehyde degradation

Ru-qin Gao, Qian Sun, Zhi Fang, Guo-ting Li, Meng-zhe Jia, Xin-mei Hou

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Ru-qin Gao, Qian Sun, Zhi Fang, Guo-ting Li, Meng-zhe Jia, and Xin-mei Hou, Preparation of nano-TiO2/diatomite-based porous ceramics and their photocatalytic kinetics for formaldehyde degradation, Int. J. Miner. Metall. Mater., 25(2018), No. 1, pp.73-79. https://dx.doi.org/10.1007/s12613-018-1548-0
Ru-qin Gao, Qian Sun, Zhi Fang, Guo-ting Li, Meng-zhe Jia, and Xin-mei Hou, Preparation of nano-TiO2/diatomite-based porous ceramics and their photocatalytic kinetics for formaldehyde degradation, Int. J. Miner. Metall. Mater., 25(2018), No. 1, pp.73-79. https://dx.doi.org/10.1007/s12613-018-1548-0
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研究论文

Preparation of nano-TiO2/diatomite-based porous ceramics and their photocatalytic kinetics for formaldehyde degradation

基金项目: 

This work was financially supported by the National Natural Science Foundation of China (No. 50708037), the National Science Fund for Excellent Young Scholars of China (No. 51522402), the Science and Technology Research Projects in Zhengzhou (No. 141PPTGG388), and the National Innovation and Entrepreneurship Training Program of the Undergraduate (No. 201610078034).

    通信作者:

    Ru-qin Gao

    Xin-mei Hou E-mail: houxinmeiustb@ustb.edu.cn

Diatomite-based porous ceramics were adopted as carriers to immobilize nano-TiO2 via a hydrolysis-deposition technique. The thermal degradation of as-prepared composites was investigated using thermogravimetric-differential thermal analysis, and the phase and microstructure were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, and transmission electron microscopy. The results indicated that the carriers were encapsulated by nano-TiO2 with a thickness of 300-450 nm. The main crystalline phase of TiO2 calcined at 650℃ was anatase, and the average grain size was 8.3 nm. The FT-IR absorption bands at 955.38 cm-1 suggested that new chemical bonds among Ti, O, and Si had formed in the composites. The photocatalytic (PC) activity of the composites was investigated under UV irradiation. Furthermore, the photodegradation kinetics of formaldehyde was investigated using the composites as the cores of an air cleaner. A kinetics study showed that the reaction rate constants of the gas-phase PC reaction of formaldehyde were κ=0.576 mg·m-3·min-1 and K=0.048 m3.

 

Research Article

Preparation of nano-TiO2/diatomite-based porous ceramics and their photocatalytic kinetics for formaldehyde degradation

Author Affilications
  • Funds: 

    This work was financially supported by the National Natural Science Foundation of China (No. 50708037), the National Science Fund for Excellent Young Scholars of China (No. 51522402), the Science and Technology Research Projects in Zhengzhou (No. 141PPTGG388), and the National Innovation and Entrepreneurship Training Program of the Undergraduate (No. 201610078034).

  • Received: 23 May 2017; Revised: 10 July 2017; Accepted: 16 July 2017;

Diatomite-based porous ceramics were adopted as carriers to immobilize nano-TiO2 via a hydrolysis-deposition technique. The thermal degradation of as-prepared composites was investigated using thermogravimetric-differential thermal analysis, and the phase and microstructure were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, and transmission electron microscopy. The results indicated that the carriers were encapsulated by nano-TiO2 with a thickness of 300-450 nm. The main crystalline phase of TiO2 calcined at 650℃ was anatase, and the average grain size was 8.3 nm. The FT-IR absorption bands at 955.38 cm-1 suggested that new chemical bonds among Ti, O, and Si had formed in the composites. The photocatalytic (PC) activity of the composites was investigated under UV irradiation. Furthermore, the photodegradation kinetics of formaldehyde was investigated using the composites as the cores of an air cleaner. A kinetics study showed that the reaction rate constants of the gas-phase PC reaction of formaldehyde were κ=0.576 mg·m-3·min-1 and K=0.048 m3.

 

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