Abstract:

To improve the film’s photocatalytic activity and stability in practice, P-25 TiO₂ film immobilized on porous nickel substrate was successfully prepared by a facile dip-coating method in situ without any binder.The characteristics of the film were investigated by XRD and FE-SEM. The effects of parameters such as time, temperature, initial concentration, pH values, luminous flux, and aeration on the photocatalysis degradation of quinoline aqueous solution were discussed. It was found that porous nickel was evenly coated by P-25 nanometer particles and the microcracks on the film surface can enhance the contact between active sites and light or contaminants, which improves resulting in the improvement of photocatalytic activity. The photodegradation experiments showed that photocatalytic degradation of quinoline significantly increased with the increasing light intensity, aeration and reaction time, especially at low pH value.  Both the initial concentration and temperature were not the primary controlling factors for the photocatalytic reaction. The photocatalytic reaction could be slightly influenced by the air stripping, disturbance and water turbulence effects during aeration process. In general, this reusable P-25 film is benefited to photodegradation of  quinoline in aqueous solution and possesses good application prospects if the temperature and pH of aqueous solution was hardly changed.

Key words: foam nickel, P-25 TiO₂, photocatalysis, quinoline, reaction parameters