Removal of indoor α-pinene with a fiber optic illuminated honeycomb monolith photocatalytic reactor.
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 μmol m(-2)s(-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.
a Institute of Environmental and Occupational Health Science, National Yang-Ming University , Taipei , Taiwan.
Kuo-Pin
KP
Yu
Grace Whei-May
GW
Lee
An-Jie
AJ
Hung
D000393:Air Pollutants / Q000737:chemistry*; D016902:Air Pollution, Indoor / Q000517:prevention & control*; D000081008:Bicyclic Monoterpenes; D002384:Catalysis; D005336:Fiber Optic Technology; D006813:Humidity; D007700:Kinetics; D039821:Monoterpenes / Q000737:chemistry*; D010084:Oxidation-Reduction; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects; D014466:Ultraviolet Rays
D000393:Air Pollutants; D000081008:Bicyclic Monoterpenes; D039821:Monoterpenes; C009495:titanium dioxide; D014025:Titanium; C005451:alpha-pinene
fiber optics; honeycomb monolith; photocatalyst; α-Pinene