Indoor air disinfection using a polyester supported TiO2 photo-reactor

Indoor Air. 2008 Dec;18(6):473-9. doi: 10.1111/j.1600-0668.2008.00548.x. Epub 2008 Sep 22.


Among the decontamination methods applicable to indoor air, heterogeneous photocatalysis has received increasing attention in recent years. This decontamination method is based on the UV irradiation of a solid catalyst, normally TiO2, aiming at the generation of highly reactive hydroxyl radicals. In this work, a novel way to prepare the photocatalyst was used, incorporating pure P-25 TiO2 (Degussa) into polyester orthophthalic polymer. The film was coated onto the walls of a PVC reactor with a concentric 30 W germicidal lamp (254 nm). The efficiency of this prototype was evaluated against fungi and bacteria elimination in a 67 m3 confined room. The system was very efficient for bacteria reduction, decreasing the bacterial count to below the detection limit (1 CFU/plate during 30-min sampling) after 2 h of operation at 195 l/min. For fungi, the gas-phase reactor showed to be less efficient and silver doping of the catalyst showed no increase in biocide activity.

Practical implications: The use of a photocatalytic reactor based on TiO2 incorporated onto polyester orthophtalic polymer has been tested at 195 l/min, showing good performance in the air disinfection of a 67 m3 room.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Air Microbiology*
  • Bacteria / growth & development
  • Colony Count, Microbial
  • Disinfection / methods*
  • Fungi / growth & development
  • Photochemistry / methods
  • Polyesters*
  • Titanium*


  • Polyesters
  • titanium dioxide
  • Titanium