Active {001} Facet Exposed TiO2 Nanotubes Photocatalyst Filter for Volatile Organic Compounds Removal: From Material Development to Commercial Indoor Air Cleaner Application

  • Seunghyun Weon
    Seunghyun Weon
    Division of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
  • Eunji Choi
    Eunji Choi
    Division of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
    More by Eunji Choi
  • Hyejin Kim
    Hyejin Kim
    Division of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
    More by Hyejin Kim
  • Jee Yeon Kim
    Jee Yeon Kim
    Frontier Research Team, Samsung Research, Samsung Electronics Company, Seoul 06765, Korea
    More by Jee Yeon Kim
  • Hee-Jin Park
    Hee-Jin Park
    Frontier Research Team, Samsung Research, Samsung Electronics Company, Seoul 06765, Korea
    More by Hee-Jin Park
  • Sae-mi Kim
    Sae-mi Kim
    Frontier Research Team, Samsung Research, Samsung Electronics Company, Seoul 06765, Korea
    More by Sae-mi Kim
  • Wooyul Kim
    Wooyul Kim
    Department of Chemical and Biological Engineering, College of Engineering, Sookmyung Women’s University, Seoul 04310, Korea
    More by Wooyul Kim
  • , and 
  • Wonyong Choi*
    Wonyong Choi
    Division of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
    *Phone: +82-54-279-2283; e-mail: [email protected] (W.C.).
    More by Wonyong Choi
Cite this: Environ. Sci. Technol. 2018, 52, 16, 9330–9340
Publication Date (Web):July 12, 2018
https://doi.org/10.1021/acs.est.8b02282
Copyright © 2018 American Chemical Society
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Abstract

TiO2 nanotubes (TNT) have a highly ordered open structure that promotes the diffusion of dioxygen and substrates onto active sites and exhibit high durability against deactivation during the photocatalytic air purification. Herein, we synthesized {001} facet-exposed TiO2 nanotubes (001-TNT) using a new and simple method that can be easily scaled up, and tested them for the photocatalytic removal of volatile organic compounds (VOCs) in both a laboratory reactor and a commercial air cleaner. While the surface of TNT is mainly composed of {101} facet anatase, 001-TNT’s outer surface was preferentially aligned with {001} facet anatase. The photocatalytic degradation activity of toluene on 001-TNT was at least twice as high as that of TNT. While the TNT experienced a gradual deactivation during successive cycles of photocatalytic degradation of toluene, the 001-TNT did not exhibit any sign of catalyst deactivation under the same test conditions. Under visible light irradiation, the 001-TNT showed degradation activity for acetaldehyde and formaldehyde, while the TNT did not exhibit any degradation activity for them. The 001-TNT filter was successfully scaled up and installed on a commercial air cleaner. The air cleaner equipped with the 001-TNT filters achieved an average VOCs removal efficiency of 72% (in 30 min of operation) in a 8-m3 test chamber, which satisfied the air cleaner standards protocol (Korea) to be the first photocatalytic air cleaner that passed this protocol.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.est.8b02282.

  • UV–vis absorption spectra and FT-IR spectra (Figure S1); XPS spectra (Figure S2); color change of a-TNT under various NaF treatment conditions (Figure S3); EDS spectra (Figure S4); XRD pattern of TNT filters in the size of 273 × 308 mm2 (Figure S5); and harmful gas removal efficiencies (as a function of time) of TNT filters installed on a commercial air cleaner (Figure S6) (PDF)

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