Study on preparation of loaded TiO_2 and its photocatalytic performance for NO_2

The photocatalysts that Fe3+/Gd3+co-doped nanometre TiO2supported on hollow glass microspheres(HGM)were synthesized by sol-gel method,and characterized by XRD,TEM techniques and DRS.The effects of the different calcination temperature,calcination time,deposition times,photocatalysts amount and reuse times on the photocatalytic activity were studied.Their photocatalytic activities were tested by degradation of nitrite.The results indicated that hollow glass microspheres coated with TiO2can significantly enhance the photocatalytic activity of nano-particle.To calcinate 500℃for 2h,load 2times and the catalyst inputs for 2.0g/L,has shown the highest catalytic activity,and the degradation percent of nitrite was about 93.81%.