Abstract
A neutral transparent SiO 2 /TiO 2 composite hydrosol was prepared by a coprecipitation-peptisation method using titanium tetrachloride and SiO 2 hydrosol as raw materials. The prepared SiO 2 /TiO 2 hydrosols were characterised by X-ray diffraction, Fourier transform infrared spectroscopy and transmission electron microscopy. The evaluation of photocatalytic activity for nitric oxide degradation showed the optimal weight ratio of SiO 2 /TiO 2 is around 1.5. After heating at 700°C for 1°h, the prepared SiO 2 /TiO 2 hydrosol exhibits much higher photocatalytic activity than the commercial TiO 2 materials, Degussa P25 and ONID TH. The presence of Ti-O-Si bond in the composite hydrosol results in its good thermal stability. The prepared transparent SiO 2 /TiO 2 hydrosols were stable without agglomeration or gelation after storage at room temperature for over 1.5 years. The neutral SiO 2 /TiO 2 hydrosol could be used as the coating material applying for glass or ceramic building materials which must be treated at high temperature.
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