The photocatalytic activity and stability of a nanosized TiO2 film prepared by carbon black modified method

Regard to the poor adsorbability of the fixing film photocatalyst, we prepared a new nanosized TiO2 thin film modified by carbon black acting as the pore-forming agent and baked by a kind of new method. The film was characterized by XRD, TEM, SEM, DRS and FT-IR techniques. The results showed that the prepared TiO2 films were mainly anatase structure, containing a little rutile. Their mean sizes of crystal grains are about 20–30 nm. Comparing to the ordinary TiO2 film, we found that both carbon black modification and new baking method could make the characteristics of films change, such as more pores, looser structure, smaller crystal grains and longer excitation wavelength. It should be owed to these advantaged characteristics that the photocatalytic activity of the new film was largely improved during the degradation of benzamide. Furthermore, it also had wonderful stability, keeping its activity for 4 months applied to degrade reactive brilliant red X-3B in the continuous flow reactor.