Immobilized Fe (III)-doped titanium dioxide for photodegradation of dissolved organic compounds in water

Isaac W. Mwangi, J. Catherine Ngila, Patrick Ndungu, Titus A.M. Msagati, Joseph N. Kamau

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


Photocatalytic degradation of dissolved organic carbon (DOC) by utilizing Fe(III)-doped TiO2 at the visible radiation range is hereby reported. The photocatalyst was immobilized on sintered glass frits with the coating done by wet method, calcinated at 500 °C and then applied in a photodegradation reactor. The addition of a transition metal dopant, Fe(III), initiated the red shift which was confirmed by UV-Vis spectroscopy, and the photocatalyst was activated by visible radiation. X-ray diffraction patterns showed that Fe(III) doping had an effect on the crystallinity of the photocatalysts. Mixtures of DOC and associated coloured solutions were degraded in first-order kinetics, showing that the degradation process was not dependent on intermediates or other species in solution. A reactor with a catalyst coating area of 12.57 cm2 was able to degrade 0.623 mg of the dissolved material per minute. Exposure of the reactor to hostile acidic conditions and repeated use did not compromise its efficiency. It was observed that the reactor regenerates itself in the presence of visible light, and therefore, it can be re-used for more than 100 runs before the performance dropped to <95 %. The results obtained indicate that the photocatalyst reactor has a great potential of application for use in tandem with biosorbent cartridges to complement water purification methods for domestic consumption.

Original languageEnglish
Pages (from-to)6028-6038
Number of pages11
JournalEnvironmental Science and Pollution Research
Issue number9
Publication statusPublished - Sept 2013


  • Dissolved organic compounds
  • Doped titanium dioxide
  • Immobilized photocatalyst
  • Kinetics
  • Photodegradation
  • Spectrophotometric red shift

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution
  • Health, Toxicology and Mutagenesis


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