Photocatalytic Evaluation of Anatase TiO2 Coating on
Ceramic Tiles by Raman Spectroscopy |
Samar Kumar Medda,1,* Srikrishna Manna1 and Goutam De2,*
Pages : 13-17
DOI : 10.1080/0371750X.2019.1696233 |
Abstract |
The present work reports a convenient way to evaluate the photocatalytic activity of
anatase TiO2 films by monitoring the degradation of methylene blue (MB) directly on
the TiO2 coated tiles under simulated solar light (1 sun condition; AM 1.5G simulator)
using Raman spectroscopy. For this purpose, nanocrystalline TiO2 films of aesthetic
quality (thickness ~80±5 nm) were deposited by the sol-gel method on the glazed
tiles. XRD and Raman studies of the calcined coatings (500oC/2 h in air) confirmed
the formation of anatase phase of TiO2. The water contact angle (ï±) value of the coated
tiles was found to be 20±1o (hydrophilic) and no significant change of ï±ï€ was noticed
after storing in ambient condition for 3 months. The MB decomposition on the TiO2
coating under 1 sun condition was monitored by recording the Raman spectra with
respect to time. Using this technique, the apparent rate constant (kapp) value of MB
degradation was found to be 0.2554 min–1. The total photo-decomposition of dye and
its repeatability studies through direct Raman monitoring of the coating surface
ensured the self-cleaning ability of the TiO2 coatings.
[Keywords: Nanocrystalline TiO2 coatings, Sol-gel, Hydrophilic, Self-cleaning,
Photocatalytic degradation, Raman spectroscopy] |
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