The systematic experiments of photocatalytic degradation of NO gas and acetaldehyde were carried out by using novel composites consisting of TiO 2-xN y loaded on two types of long afterglow phosphor, CaAl 2O 4:(Eu,Nd) and Sr 4Al 14O 25:(Eu,Dy). The two kinds of composites were prepared in a sequence of the same procedures, which involved reactions of TiCl 3 and hexamethylenetetramine (HMT) mixed solution at 190 °C for 2 h to precipitate nano-size TiO 2-xN y particles, followed by mixing the TiO 2-xN y with a micro-size CaAl 2O 4:(Eu,Nd) or Sr 4Al 14O 25:(Eu,Dy) particles by a facile planetary ball milling to yield CaAl 2O 4:(Eu,Nd)/TiO 2-xN y or Sr 4Al 14O 25:(Eu,Dy)/TiO 2-xN y composites. Both composites showed the persistent photocatalytic degradation of NO and acetoaldehyde after turning off the light. CaAl 2O 4:(Eu,Nd) /TiO 2-xN y showed higher persistent NO destruction ability in dark after turning off the light, while Sr 4Al 14O 25:(Eu,Dy)/TiO 2-xN y is excellent in CH 3CHO removal. The difference in the photocatalytic activity observed for CaAl 2O 4:(Eu,Nd)/TiO 2-xN y and Sr 4Al 14O 25:(Eu,Dy)/TiO 2-xN y might be attributed to the difference in the emission property.
- Nitrogen-doped TiO
- Persistent luminescence assisted
- Photocatalytic reaction
ASJC Scopus subject areas
- Process Chemistry and Technology
- Physical and Theoretical Chemistry