TiO2SiO2 Composite Films Immobilized on Foam Nickel Substrate for the Photocatalytic Degradation of Gaseous Acetaldehyde

الملخص EN

The photocatalyst anatase titanium dioxide (TiO2) films were immobilized via sol-gel technique on foam nickel modified with SiO2 films as transition layer (indicated as TiO2/SiO2 films).

The structural properties of TiO2/SiO2 composite films were characterized using TG-DSC, XRD, FE-SEM, and BET.

The photocatalytic activities of immobilized TiO2/SiO2 films were tested through photocatalytic degradation reactions of gaseous acetaldehyde under ultraviolet (UV) light irradiation.

The substrate modification with transition layer of SiO2 films improved the specific surface area (SSA) of substrate and the acetaldehyde adsorption on photocatalyst film enormously and resulted in great enhancement of photocatalytic activity and stability.

The degradation ratio of gaseous acetaldehyde (concentration of 100 ppmv) on TiO2/SiO2 photocatalysts reached 100% after 100 minutes of irradiation.

The photocatalytic activity of TiO2/SiO2 films reduced about 15% after 9 consecutive runs, which was more stable than that of TiO2 films, and was completely recovered after heating at 300°C for 1 hour.