3-dimensional hierarchical TiO2 micro-sized particles were prepared by using modified sol-gel process with polyethylene glycol (PEG) as a surface-directing agent. After calcination at 450 �C, the crystal structure was anatase phase. The size and specific surface area of particles were 1.0-1.8 �m and 96.85 m2/g, respectively. The specific surface area of the TiO2 particles corresponded to that of the spherical nanoparticles with average size of 15.9 nm. Although the size of synthesized TiO2 was micro-scale, they had the specific surface area similar to that of nano-scale particles due to their effect of morphological property. Subsequently, to modify the surface of TiO2 with hydroxyl groups, the hydroxylation treatment was carried out and the amount of surface hydroxyl groups was controlled by the changing concentration of aqueous NH4OH solution. As the higher concentration of NH4OH solution was used, the more hydroxyl groups were introduced on the TiO2 surface. As an application of prepared TiO2 for water treatment, their catalytic performances for the degradation of methylene blue were examined by using UV-Vis spectrophotometer with the assistance of UV lamp. After hydroxylation treatment, the TiO2 macro-sized particles showed the higher performance of MB degradation than that of nano-sized P25 particles because of their large specific surface area and hydroxyl-rich surface.

Microsized TiO<sub>2</sub> particles with nanoscale effect: Influence of hydroxyl concentration on their photocatalytic activities

247th National Meeting (2014)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.

Microsized TiO2 particles with nanoscale effect: Influence of hydroxyl concentration on their photocatalytic activities

Microsized TiO₂ particles with nanoscale effect: Influence of hydroxyl concentration on their photocatalytic activities