A comparative study of supported TiO2 as photocatalyst in water decontamination at solar pilot plant scale

Mahmut Kus, Wolfgang Gernjak, Pilar Fernández Ibáñez, Sixto Malato Rodríguez, Julián Blanco Gálvez, Siddik Icli

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

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 × 10-1 and 6 × 10-2 mg m2/kJ for organic compounds, and 6 × 10-2 and 6 × 10-3 for total organic carbon.

Original languageEnglish
Pages (from-to)331-337
Number of pages7
JournalJournal of Solar Energy Engineering, Transactions of the ASME
Volume128
Issue number3
DOIs
Publication statusPublished - 27 Nov 2006

Keywords

  • Photocatalysis
  • Silver deposition
  • Sol-gel film
  • Supported catalyst

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