Abstract
The preparation of TiO2-coated polyester fabrics for purposes of photocatalytic water purification requires coating agents with crystalline TiO2 particles preferably in the anatase modification. The resulting coatings should exhibit a high water resistance and high photocatalytic activity according to reaction with structurally different dyestuffs. For this, the synthesis of anatase sols by hydrolysis of tetraisopropyltitanate in acidic medium under reflux was optimized. By precoating or addition of polymeric epoxysilanes a good adhesion on the polyester support could be realized. The photocatalytic activity was tested with different dyestuffs as: Methylene blue, Rhodamine B and the azo dyes AcidOrange 7 and C.I. Reactive red 158. The rate of photodestruction depends strongly on the type of used dye and its structure. Surprisingly, no differences in photodegradation were found in case of investigations with Rhodamine B, if the photoreaction is performed under exposure with UV or with visible light. A possible explanation of the similar behavior of photoreaction under different light sources could be a photodestruction by electron transfer from Rhodamine B to TiO2. Therefore, Rhodamine B seems to be generally not suitable for the evaluation of the photoactivity of TiO2 under irradiation with visible light.
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Acknowledgments
The authors would like to thank Prof. Dr. Dirk C. Meyer and Dipl.-Phys. Emanuel Gutmann, Technische Universität Dresden, Institut für Strukturphysik, for the WAXS measurements, and the Evonik Tego Chemie GmbH Essen for the sampling of actual epoxysilanes. For help with determination of redox potentials the authors owe thanks to Dr. A. Bund (Technische Universität Dresden, Department of Electrochemistry). The work was supported by the German Federal Ministry for Economics and Labour, program InnoNet, project 16IN0565.
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Böttcher, H., Mahltig, B., Sarsour, J. et al. Qualitative investigations of the photocatalytic dye destruction by TiO2-coated polyester fabrics. J Sol-Gel Sci Technol 55, 177–185 (2010). https://doi.org/10.1007/s10971-010-2230-9
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DOI: https://doi.org/10.1007/s10971-010-2230-9