International Journal of Photoenergy / 2008 / Article / Fig 5

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

Figure 5

Quantum efficiencies ( b ๎…ž ) (mol/Einstein) of methane, extrapolated by (17), at infinite concentration of substrate, evaluated as mean values (black dots) relative to measurements in aqueous solution and in the gaseous phase, reported in Figure 4, as a function of absorbed power per unit length of irradiated photocatalytic membrane, expressed asโ€‰W ๐‘‘ ๐ถ ๐‡ ๐Ÿ ๐Ž ๐Ÿ / d ๐‘ก cmโˆ’1. The blue curve represents the calculated contribution of reaction (b), as modeled in the present work, decreasing with increasing power. The red curve represents the calculated contribution of reaction โ€ข O H + โ€ข O H โŸถ H 2 O 2 ( a ) , as modeled in the present work, increasing with increasing power. The mauve curve represents equation modeled in the present work, as a sum of both these contributions. Photocatalytic membranes used in the relative experiments did not contain any photopromoting agent.
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