Inherent rate constants and humidity impact factors of anatase TiO2 film in photocatalytic removal of formaldehyde from air
作者： Xiaobing Zhu , Da-Lei Chang , Xiao-Song Li , Zhi-Guang Sun , Xiao-Qing Deng
DOI: 10.1016/J.CEJ.2015.05.095
关键词:
摘要: Abstract In photocatalytic oxidation (PCO) of volatile organic compounds (VOCs), even if using the same UV lamp, reaction rate constant a photocatalyst denoted as k ( I , H ) Lamp is still affected by operation conditions light intensity (I) and humidity. It great significance to find characteristic parameters photocatalysts, which excludes effect above-mentioned enables direct comparisons photocatalysts. For this purpose, PCO formaldehyde in synthetic air continuous-flow reactor over transparent films anatase TiO2 was investigated three commercially available lamps, i.e. UVC, UVA black (UVA1) white (UVA2). Thereby, inherent that only related wavelength lamp but independent humidity found. suggested sequence under UVC >> 1 ∼ 2 which, for instance, are 1.6, 0.33 0.26 cm2 s−1 mW−1 at low intensity, respectively. Moreover, impact factor (fH) approximately 3, 0 −0.4 regimes low, medium high (LH, MH, HH), respectively, manifests positive, zero-sum negative effects on rate. The MH regime observed first time. Finally, generalized quantitative relationship express function built.
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