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International Journal of Photoenergy
Volume 2013, Article ID 614567, 9 pages
Research Article

Evaluation of Photocatalytic Active Coatings on Sintered Glass Tubes by Methylene Blue

1University of Applied Sciences Mittelhessen, Laboratory of Material Science, Surface Interface and System Design, Wiesenstraße 14, 35390 Giessen, Germany
2University of Applied Sciences Mittelhessen, Institute of Bioprocess Engineering and Pharmaceutical Technology, Wiesenstraße 14, 35390 Giessen, Germany
3Department of Chemical Engineering, Faculty of Engineering, Kansas State University, Manhattan, KS 66506, USA
4Department of Chemistry, Faculty of Biology and Chemistry, Justus-Liebig-University Giessen, 35392 Giessen, Germany

Received 12 May 2013; Revised 11 September 2013; Accepted 14 September 2013

Academic Editor: Niyaz Mohammad Mahmoodi

Copyright © 2013 Colin Awungacha Lekelefac et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A comparative study between ten different photocatalytic active coatings was done. The effectiveness and photocatalytic activity of the coatings were studied by degradation experiments of methylene blue (MB) dye under UV light illumination. The reactor design consisting of sintered glass packed in a borosilicate tube placed between two planar dielectric barrier discharge lamps (Osram Planon) is reported for the first time. The coatings consisted of either titania, silica, or zinc on sintered borosilicate glass. The advantage of sol-gel in catalyst preparation was exploited to combine catalyst to act as cocatalyst. TiO2-P25 widely applied in suspension systems was effectively immobilized on sintered glass support with the aid of tetraethylorthosilicate (TEOS) solution which acted as support material. Results indicated that TiO2-P25+SiO2, TiO2-P25+SiO2+Pt, and TiOSO4_30,6wt% films showed highest degradation rates close to 100% after 90 min illumination with degradation rates exceeding 50% after 30 minutes. TTIP+Pt showed lowest degradation rate.