Active {001} Facet Exposed TiO2 Nanotubes Photocatalyst Filter for Volatile Organic Compounds Removal: From Material Development to Commercial Indoor Air Cleaner Application
- Authors
- Weon, Seunghyun; Choi, Eunji; Kim, Hyejin; Kim, Jee Yeon; Park, Hee-Jin; Kim, Sae-mi; Kim, Wooyul; Choi, Wonyong
- Issue Date
- Aug-2018
- Publisher
- AMER CHEMICAL SOC
- Citation
- ENVIRONMENTAL SCIENCE & TECHNOLOGY, v.52, no.16, pp 9330 - 9340
- Pages
- 11
- Journal Title
- ENVIRONMENTAL SCIENCE & TECHNOLOGY
- Volume
- 52
- Number
- 16
- Start Page
- 9330
- End Page
- 9340
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/4380
- DOI
- 10.1021/acs.est.8b02282
- ISSN
- 0013-936X
1520-5851
- 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-m(3) 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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