Research Article
Influence of Irradiance, Flow Rate, Reactor Geometry, and Photopromoter Concentration in Mineralization Kinetics of Methane in Air and in Aqueous Solutions by Photocatalytic Membranes Immobilizing Titanium Dioxide
Table 1
Parameters, and , and , able
to fit the whole photomineralization curve, following Scheme (2), at various
values of absorbed power per unit length of membrane expressed inβWcmβ1.
They were obtained by the optimization of kinetic curves, by using the set of
differential equations corresponding to kinetic model of Scheme (2). All the
parameters are expressed in ppm of carbon (mass of C/volume, mg/L) and refer to
the photodegradation of methane in gaseous phase, and in aqueous solutions, in
the presence of stoichiometric hydrogen peroxide (for the aqueous solutions) or
of dioxygen of air (for the gas-phase experiments), as oxygen donors (treated
volume of the gas phase or of the aqueous solutions 4.00βL; membrane length
βcm; ratio between overall reaction volume and membrane length 160 Β± 6 cm3/cm2; PHOTOPERBIT/313 membranes immobilizing 30 Β± 3βwt.% TiO2, in the absence of
any photopromoter).
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*Uncertainties are indicated between parentheses and expressed, relatively to the last digits, as probable errors of the means of optimized values from 9 sets of runs in the range of concentrations tested.**Data relative to these experiments were taken from
[14]. |