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RESEARCH PAPERS

A Comparative Study of Supported TiO2 as Photocatalyst in Water Decontamination at Solar Pilot Plant Scale

[+] Author and Article Information
Mahmut Kus

Solar Energy Institute, Ege University, Bornova, Izmir 35100, Turkeymahmut.kus@ege.edu.tr

Wolfgang Gernjak, Pilar Fernández Ibáñez, Sixto Malato Rodríguez, Julián Blanco Gálvez

 Plataforma Solar de Almería (CIEMAT), Tabernas, Almería, 04200, Spain

Siddik Icli

Solar Energy Institute, Ege University, Bornova, Izmir 35100, Turkeysiddik.icli@ege.edu.tr

J. Sol. Energy Eng 128(3), 331-337 (Nov 29, 2005) (7 pages) doi:10.1115/1.2210494 History: Received June 29, 2005; Revised November 29, 2005

The degradation of gallic acid and imidacloprid with supported Millennium PC500 and Degussa P25 TiO2 is reported. TiO2 particles were immobilized using a titanium sol-solution and direct deposition on glass supports. The film characterization was done by x-ray diffraction, scanning electron microscopy, and atomic force microscopy, and degradation of organic compounds was monitored by high-performance liquid chromatography, total organic carbon analyzer, and ion chromatography. The experiments were performed under sunlight in compound parabolic collector plants with flat supports inside the glass tubes. Photocatalytic activity of the films was compared and identified. Although sol-gel coatings had better mechanical properties, mineralization was observed to be approximately five times slower than paste-deposited films. Photoactivity of the films decreased with silver deposition due to the nature of the organic compounds. The rate constants were calculated to be between 2×101 and 6×102mgm2kJ for organic compounds, and 6×102 and 6×103 for total organic carbon.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic drawing of the CPC reactor and supported catalyst inserted in CPC

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Figure 2

XRD pattern of TiO2 films. A, B, and S refers to anatase, rutile, and silver, respectively.

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Figure 3

SEM images of TiO2 films: (a) P25 paste, (b) P25 paste (cross section), (c) SG-P25, (d) P25-Ag SG, (e) PC500 SG, and (f) PC500-Ag SG

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Figure 4

AFM images of PC500 SG and P25 SG films. A and B refer to PC500 SG and P25 SG, respectively. The top images are roughness of the films and the bottom image are the topology of the film surfaces.

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Figure 5

Photocatalytic degradation of gallic acid with different TiO2 films in CPC. (a) and (b) refer to gallic acid and TOC, respectively.

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Figure 6

Photocatalytic activity of TiO2 films. Total radiation energy reaching the reactor is 100kJ∕Lm2.

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Figure 7

Adsorption isotherms of gallic acid on the surface of TiO2 films

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Figure 8

Photocatalytic degradation of imidacloprid with PC500 paste film: (a) imidacloprid and TOC, and (b) concentration of ions during degradation

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