Activated- and temperature-controlled carbon filter to avoid interferences of ozone and nitrogen dioxide on semiconducting gas sensors

This paper discusses with the influence of temperature in the control of an activated carbon filter for ozone removal. Normally, the gas removal efficiency of activated carbon filters declines rapidly. Based on experimental results, we demonstrate that the activated carbon filter controlled by temperature enhances the ozone removal and has no relevant effect on the nitrogen dioxide removal. Furthermore, the temperature can be used to regenerate the activated carbon filter previously exposed to the ozone. The association of the activated carbon filter with the SnO2 gas sensor is evaluated in order to build a selective gas sensors array between the nitrogen dioxide and the ozone. The interpretation of the interaction processes between ozone and the activated carbon filter is also discussed.