Photocatalytic degradation of acetylene over various titanium dioxide-based photocatalysts

摘要

The photodegradation of acetylene (C_2H_2) was investigated over various powders or supported titanium dioxide (TiO_2) photocatalysts in air into static conditions.It was found that UV-irradiated TiO_2 is effective in order to lead to the complete mineralization of the pollutant containing a triple carbon-carbon bonding without deactivating.No organic intermediates were detected in the gas phase,implying that oxidation mechanisms take place in the adsorbed phase.The efficiency of P25-Degussa and PC500-Millennium photocatalysts were compared;the mixed anatase/rutile P25-Degussa is reported as the most efficient photocatalytical material in our conditions.The topology of the photocatalyst support is reported as a significant parameter in TiO_2 efficiency.Fibre-deposited photocatalysts lead to the highest activity,and the chemical nature of the fibre did not influence the photodegradation.The influence of TiO_2 amonut,silica binder and adsorbing additives such as zeolite,and activated carbon coupled with TiO_2 photocatalyst were investigated.