Abstract
Photocatalytic micro-channel reactor was designed by exploiting porous ceramic disks as a support for TiO 2 photocatalyst. Ethanol solution of titanyl(IV)acetylacetonate and a commercial titania sol were used as the starting materials for the synthesis of TiO 2 layer. A rougher surface of the TiO 2 channel was prepared from titanyl(IV)acetylacetonate solution by comparing with that from a titania sol. Photocatalytic activity of the micro-channel reactor at various circulation velocities was evaluated by measuring the decay of absrobance of methylene blue aqueous solution. Since the porous disks prepared with the titania sol showed a higher photocatalytic activity at medium flow rates, the surface roughness of the TiO 2 was found to decrease the activity. A stagnation region near the rough surface may expand at higher flow rates and then the mass transfer between the TiO 2 surface and the laminar flow was suppressed for the reactant molecules and decomposition intermediates.
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