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Freestanding Doubly Open-ended TiO2 Nanotubes for Efficient Photocatalytic Degradation of Volatile Organic Compounds
Title of paper Freestanding Doubly Open-ended TiO2 Nanotubes for Efficient Photocatalytic Degradation of Volatile Organic Compounds
Author [박태호·최원용 교수 연구팀]
Publication in journal Applied Catalysis B: Environmental 205, p386-392 (May 2017)
Publication date 2017-05-15

[Abstract]
We synthesized freestanding doubly open-ended TiO2 nanotubes (DNT) film and compared their photocatalytic activity and durability during the repeated degradation cycles of volatile organic compounds (VOCs) with those of TiO2 nanotubes (TNT) film. DNT exhibited higher activity and durability for the photocatalytic degradation of gaseous acetaldehyde and toluene than TNT. The doubly open-ended structure of DNT allows O2 molecules to be easily supplied to the active sites, which increases not only the intrinsic photocatalytic activity but also the resistance to catalyst deactivation. The freestanding DNT film was additionally loaded with TiO2 nanoparticles (NP@DNT) in the inner wall to further increase the activity for VOC degradation. The photocatalytic activity of NP@DNT was higher than bare DNT and bare TNT by 1.3 and 1.8 times, respectively. Unlike the case of DNT, the TiO2 nanoparticles loaded TNT (NP@TNT) exhibited a lower activity than bare TNT, probably because the TiO2 nanoparticles blocked the TNT channels with hindering the mass transfer of O2 and VOC molecules. DNT with doubly open-ended structure serves as a versatile platform of fabricating nanostructured photocatalysts with maintaining the open channel structure that facilitates the mass transfer of O2 and VOC molecules.
 
DOI: 10.1016/j.apcatb.2016.12.048