Preparation of large scale photocatalytic TiO2 films by the sol-gel process

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)251-257
Journal / PublicationSurface and Coatings Technology
Volume205
Issue number2
Publication statusPublished - Oct 2010
Externally publishedYes

Abstract

Nanocrystalline titanium dioxide films were formed on frosted and clear borosilicate glass with a large surface area (12×22cm) using doctor blade and spray coating techniques. The films were subjected to a high temperature treatment at 550°C. X-ray diffraction (XRD) analysis indicated that the TiO2 films contain only the anatase phase. Optical microscopy was used to determine the morphology changes after the deposition of each layer. Scanning electron microscopy (SEM) was used to study the films surface morphology. The large scale TiO2 films produced showed a high photocatalytic activity which was evaluated by the degradation of methyl orange (MO) in aqueous solution (10mgL-1) under illumination of a UV light source with an overall irradiance of 0.9mWcm-2. UV-visible spectrophotometry was used to monitor the degradation of MO through the decrease of the main absorbance peak at 464nm. The results demonstrated that a complete decomposition of MO could be achieved after 2h of UV irradiation. © 2010 Elsevier B.V.

Research Area(s)

  • Doctor blade, Large scale TiO2 thin films, Photocatalytic activity, Sol-gel, Spray coating