Removal of indoor α-pinene with a fiber optic illuminated honeycomb monolith photocatalytic reactor

Kuo Pin Yu, Grace Whei May Lee*, An Jie Hung

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


This study was undertaken to investigate the influencing factors including gas flow rate, inlet α-pinene concentration and relative humidity on the removal of α-pinene in a Degussa P25 supported honeycomb monolith reactor. We used the fiber optic illumination to enhance the intensity of UV-light irradiating on the Degussa P25 photocatalyst. The α-pinene conversion increased with the increase of gas flow rate indicating that the reaction rate was associated with the gaseous phase mass transfer. The α-pinene conversion varied between 91% and 96% in the range of inlet α-pinene concentration (400-2400 ppb) and relative humidity (30-70%) examined. The kinetics fits the Langmuir-Hinshelwood model. The rate coefficient (k) of α-pinene under RH30%, 50% and 70% was 0.82, 0.24, and 0.18 mol m -2s-1, respectively. The competitive Langmuir adsorption constants for α-pinene under RH30%, 50% and 70% were 0.17, 0.56 and 1.74 ppm-1, respectively. The effect of relative humidity on α-pinene conversion depends on the inlet α-pinene concentration and raising relative humidity in sum has a positive effect on the reduction of partially oxidized intermediates within the range investigated.

Original languageEnglish
Pages (from-to)1110-1115
Number of pages6
JournalJournal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering
Issue number10
StatePublished - 24 Aug 2014


  • fiber optics
  • honeycomb monolith
  • photocatalyst
  • α-Pinene


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