The photodegradation of 4-nitrophenol in aqueous solution was studied by using titania-based photo-catalysts, in particular standard commercial titania samples (anatase and rutile, Hunstmann; P25 andAeroxide VP P90, Evonik) and a mesoporous and nanocrystalline titania synthesized under hydrothermalconditions. A comparison between the commercial products and our preparations made evident a differ-ent particle size and phase composition. Moreover, in order to investigate a possible synergism betweenTiO2and carbon nanotubes (CNTs), further two samples were purposely synthesized by adding to thereaction mixture used for the catalyst preparation a small amount of single-walled or multi-walled carbonnanotubes (SWCNTs and MWCNTs). Among the investigated solids, the nanocrystalline titania resulted tobe the most active photocatalysts. The less active solids were rutile and mesoporous titania. The additionof a small amount of MWCNTs further increased the photoactivity of the nanocrystalline titania.
A comparison of the photocatalytic activity between commercial andsynthesized mesoporous and nanocrystalline titanium dioxide for4-nitrophenol degradation: Effect of phase composition, particle size,and addition of carbon nanotubes
Giuseppe Fierro;
2015
Abstract
The photodegradation of 4-nitrophenol in aqueous solution was studied by using titania-based photo-catalysts, in particular standard commercial titania samples (anatase and rutile, Hunstmann; P25 andAeroxide VP P90, Evonik) and a mesoporous and nanocrystalline titania synthesized under hydrothermalconditions. A comparison between the commercial products and our preparations made evident a differ-ent particle size and phase composition. Moreover, in order to investigate a possible synergism betweenTiO2and carbon nanotubes (CNTs), further two samples were purposely synthesized by adding to thereaction mixture used for the catalyst preparation a small amount of single-walled or multi-walled carbonnanotubes (SWCNTs and MWCNTs). Among the investigated solids, the nanocrystalline titania resulted tobe the most active photocatalysts. The less active solids were rutile and mesoporous titania. The additionof a small amount of MWCNTs further increased the photoactivity of the nanocrystalline titania.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
