Journal
APPLIED SURFACE SCIENCE
Volume 479, Issue -, Pages 31-38Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2019.01.261
Keywords
TiO2; Photocatalysis; Acetaldehyde; Superhydrophilicity; Air purification
Categories
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2018R1D1A1B07040916]
- Korea Basic Science Institute [D39613]
- Hyundai Motor Chung Mong-Koo Foundation
- National Research Council of Science & Technology (NST), Republic of Korea [D39613] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2018R1D1A1B07040916] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Recently, TiO2 photocatalysts have been applied in various ways for outdoor air purification. The main challenge with these applications is the stability of the photocatalysts, as the surface of TiO2 can be easily deactivated by contaminants found in outdoor environments. For example, it is difficult to remove oily contaminants with water once they are exposed to the photocatalyst surface since the hydrophilicity of TiO2 is not sufficiently high to allow for self-cleaning. In the present work, we modified the surface of commercial TiO2 nanoparticles to be more hydrophilic; this was done by coating them with a thin polydimethylsiloxane (PDMS) layer and applying a subsequent heat treatment under vacuum. The surface-modified TiO2 showed outstanding ability to repel oily contaminants deposited on its surface upon exposure to water droplets due to its superhydrophilic properties. Then, we evaluated the UV-light-driven photocatalytic activity of the surface-modified TiO2 for the decomposition of acetaldehyde. The surface-modified TiO2 showed photocatalytic activity for the decomposition of acetaldehyde that was comparable to that of bare TiO2. We show that our hydrophilic-surface-modified TiO2 has high potential for applications in outdoor air purification for an extended time period.
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