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Enhanced photocatalytic activity of TiO2/Ca12Al14O33 in NO removal

  • Environmental Engineering
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Abstract

TiO2 supported on Ca12Al14O33 (Mayenite) was synthesized and investigated for use as a photocatalytic concrete material. TiO2/Mayenite (TiO2/M) catalysts were prepared with varying TiO2 loading amounts (1–20 wt%). The photocatalytic activity of the catalysts was measured using the ISO standard NO removal test. TiO2/M catalysts exhibited significantly enhanced photocatalytic activities compared to pure TiO2, with the NO removal efficiency increasing as TiO2 loading increased up to 10 wt% and then decreasing with further loading of TiO2. The NO removal rate of the TiO2/M catalyst, which contained 10 wt% TiO2, was 8.72 µmol (equivalent to 350 µmol/m2·h). X-ray photoelectron spectroscopy (XPS) analysis suggested that oxygen on the TiO2/M catalysts with low TiO2 loading exists in the form of Ti−OH rather than TiO2. This study focuses on the formation of Ti−OH on the catalyst surface, which is promoted by the unique crystal structure of Mayenite that supplies oxygen ions and electrons to the TiO2 layer. The NO removal efficiency of the catalysts was found to be dependent on the interaction between TiO2 and Mayenite. Overall, this study demonstrates the potential of TiO2/Mayenite for use as a highly effective photocatalytic concrete material, with the unique properties of the Mayenite support playing a critical role in enhancing the photocatalytic activity of the catalyst.

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Acknowledgement

This work is supported by the Korea Agency for Infrastructure Technology Advancement (KAIA) grant funded by the Ministry of Land, Infrastructure and Transport (Grant: 21CTAP-C157328-02).

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Authors and Affiliations

  1. Department of Chemical Engineering Education, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Korea

    Ji Hye Park & Kwang Bok Yi

  2. Graduate School of Energy Science and Technology, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Korea

    Min Woo Hong & Wathone Oo

  3. Department of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology, 283 Goyangdae-ro, Ilsanseo-gu, Goyang-si, Gyeonggi-do, 10223, Korea

    Jung Joon Park

  4. BENTECHFRONTIER Co., Ltd., 77 Yongbong-ro, Buk-gu, Gwangju, 61186, Korea

    Hee Ju Park

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  1. Ji Hye Park
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  2. Min Woo Hong
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  3. Wathone Oo
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  4. Jung Joon Park
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Correspondence to Kwang Bok Yi.

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Park, J.H., Hong, M.W., Oo, W. et al. Enhanced photocatalytic activity of TiO2/Ca12Al14O33 in NO removal. Korean J. Chem. Eng. 40, 2906–2913 (2023). https://doi.org/10.1007/s11814-023-1485-0

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  • DOI: https://doi.org/10.1007/s11814-023-1485-0

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