Role Of Phosphorus In Synthesis Of Phosphated Mesoporous Tio_2 Photocatalytic Materials By Eisa Method

摘要

The phosphated mesoporous TiO_2 (PMT) were synthesized by using evaporation-induced self-assembly approach (EISA) with phosphorus content from 1 to 15 mol%. The X-ray diffraction and N_2 adsorption-desorption isothermal results reveal that the incorporating of phosphorus is of benefit to improving the thermal stability and enhancing the surface area of mesoporous TiO_2 by constraining the growth of anatase crystallite. XPS confirms the phosphorus in the calcined PMT exists as amorphous titanium phosphate in a pentavalent-oxidation state (P~(5+)) and embedded into the nanocrystalline anatase TiO_2. In photodegradation gas phase acetaldehyde, the photocatalytic activity of PMT samples is higher than that of pure mesoporous TiO_2 and P25. It is believed that the enhancing photocatalytic activity of phosphated mesoporous TiO_2 is mainly caused by two factors relative with the incorporating of phosphorus in framework.