Photocatalytic activities of Ag/TiO2 (Degussa P25), Au/TiO2 (Degussa P25) and temperature treated TiO2 (Degussa P25) on the 4-chlorophenol degradation were studied. A batch-type reactor was used to carry out the reaction with suspended TiO2, while a continuous multi-stage reactor was used for immobilized TiO2 under an irradiation of 11 W low pressure mercury lamp with the wave length of 200-300 nm. From the batch type reactor, the presence of either temperature treated TiO2, Ag/TiO2 or Au/TiO2 affects insignificantly the 4-CP degradation compared to the photolysis. In contrast, TiO2 significantly affects the formation/degradation of intermediates, hydroquinone and hydroxyhydroquinone. The presence of Ag and Au does not improve the catalytic activity of TiO2 in the 4-CP degradation but it affects the degradation of the intermediates. TiO2 was immobilized on the cylindrical stainless steel mesh by dip-coating with the suspension of TiO2 (Degussa P25) in methanol and used as the catalyst in the multi-stage reactor unit. The titania on the stainless steel mesh support was found to be well adhered and its activity was still high after the regeneration.

Photocatalytic degradation of 4-chlorophenol: Effects of Ag and Au and its activity in a multi-stage reactor

245th National Meeting (2013)

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