P040_0453_ Effect of the ultraviolet irradiation intensity on the self-cleaning performance and physical properties of cotton fabric surfaces treated with a TiO2 nanosol

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Siriwan Kittinaovarat

Titiyaporn Sansakda

Published Sep 5, 2019

Abstract

The performance of cotton fabric surfaces after treatment with a TiO2 nanosol, and then cured by ultraviolet irradiation (UV) at three different intensities of 294, 622 and 938 mJ/cm2 for five cycles, were evaluated in terms of dye decomposition, coffee stain removal, antibacterial activity and physical properties. The titanium tetraisopropoxide (TTIP)-treated cotton fabric surfaces cured at different intensities of UV under exposure to UV lamp or Daylight 65 lamp had a similar ability to decompose the CIBACRON RED LS BHC reactive dye and coffee stain, although it was marginally better under the UV lamp. In addition, the higher UV irradiation intensity used in curing the TTIP-treated fabrics, the higher was the decomposition of reactive dye and removal of coffee stain. No significant antibacterial activity against S. aureus and E. coli, in terms of a growth-free clear zone, was noted for the untreated and treated fabrics, but the TTIP-treated cotton fabric cured at either 622 or 938 mJ/cm2 showed a slight antibacterial activity in terms of no E. coli growth occurred underneath the fabric. With respect to the physical properties, the TTIP-treated fabrics cured at higher UV irradiation intensities showed a much higher yellow discoloration and lower tensile strength retention. The X-ray diffractometry patterns of the TTIP-treated cotton fabric surfaces cured at different intensities of UV irradiation showed the peak of anatase phase of TiO2, while TiO2 nano particles were observed on their surface by scanning electron microscopy analysis.


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