Ultra fine SO 2- 4/TiO 2-SiO 2 complex catalysts were synthesized by the one-step calcination method,which used titania sulfate and white carbon as raw materials and polyvinyl alcohol as dispersing agent. Catalysts are characterized by XRDIRTDA and BET. Different preparation factors were discussed.The catalysts consisting of SO 2- 43.4% and TiO 2∶SiO 2=1∶6 showed excellent reaction activity and stability for the photocatalytic degradation of phenol.Controlling calcination temperature and time (450℃,2h) could avoid or diminish the formation of Ti-O-Si bond and obtain higher V g and better dispersivity of TiO 2 on the surface of SiO 2.The kinetic study on photocatalytic degradation of phenol with the complex catalysts in a suspension system under 40W UV-lamp showed that apparent rate constant k conformed to a zero-order kinetic model at initial concentration <100mg·L -1 and increased with increasing pH value of phenol solution up to pH=12.When pH=10,k=3.32×10 -1 mg·L -1 ·min -1 . Solar photocatalytic experiment also gave good results.
A series of NiO/SiO2 aerogel catalysts were prepared by sol gel method. The effects of the nickel content on the structure and existing forms of NiO/SiO2 aerogel catalysts were investigated by using XRD, TPR and FT IR. The results showed that there were interactions between NiO and SiO2. But as nickel content increased, the interaction decreased. The nickel oxide in the catalysts appeared in different forms as nickel content was changed. When the content was less than 13%, Ni? entered into the SiO2 structure completely and it became clusters after calcining. If the content altered from 20% to 50%, NiO existed as both microcrystal and clusters, the later spices was dominating. However, when the content increased to 70%, microcrystal became the primary components.
