TiO2 Nanotubes with Open Channels as Deactivation-Resistant Photocatalyst for the Degradation of Volatile Organic Compounds

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School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Korea
*Phone: +82-54-279-2283; e-mail: [email protected]
Cite this: Environ. Sci. Technol. 2016, 50, 5, 2556–2563
Publication Date (Web):February 8, 2016
https://doi.org/10.1021/acs.est.5b05418
Copyright © 2016 American Chemical Society
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Abstract

We synthesized ordered TiO2 nanotubes (TNT) and compared their photocatalytic activity with that of TiO2 nanoparticles (TNP) film during the repeated cycles of photocatalytic degradation of gaseous toluene and acetaldehyde to test the durability of TNT as an air-purifying photocatalyst. The photocatalytic activity of TNT showed only moderate reduction after the five cycles of toluene degradation, whereas TNP underwent rapid deactivation as the photocatalysis cycles were repeated. Dynamic SIMS analysis showed that carbonaceous deposits were formed on the surface of TNP during the photocatalytic degradation of toluene, which implies that the photocatalyst deactivation should be ascribed to the accumulation of recalcitrant degradation intermediates (carbonaceous residues). In more oxidizing atmosphere (100% O2 under which less carbonaceous residues should form), the photocatalytic activity of TNP still decreased with repeating cycles of toluene degradation, whereas TNT showed no sign of deactivation. Because TNT has a highly ordered open channel structure, O2 molecules can be more easily supplied to the active sites with less mass transfer limitation, which subsequently hinders the accumulation of carbonaceous residues on TNT surface. Contrary to the case of toluene degradation, both TNT and TNP did not exhibit any significant deactivation during the photocatalytic degradation of acetaldehyde, because the generation of recalcitrant intermediates from acetaldehyde degradation is insignificant. The structural characteristics of TNT is highly advantageous in preventing the catalyst deactivation during the photocatalytic degradation of aromatic compounds.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.est.5b05418.

  • XRD of TiO2 samples (Figure S1); Absorption spectra of TNP and TNT films (Figure S2); Toluene degradation rate constants obtained using various TNP films (Figure S3); FT-IR spectra of fresh and deactivated TiO2 (Figure S4); Repeated cycles of photocatalytic degradation of toluene (Figure S5); Repeated cycles of photocatalytic degradation of acetaldehyde (Figure S6) (PDF)

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