Different Ions Affect Tungsten Oxide Photocatalytic Activity

When different ions are present in the solution, they will have different effects on the activity of the tungsten oxide photocatalyst. The reason for the influence is similar to the dye sensitization process of tungsten oxide photocatalyst, and the activity of the tungsten oxide photocatalyst is changed by changing the surface structure of the tungsten oxide photocatalyst.

In the photocatalytic degradation of humic acid by inorganic ions on tungsten trioxide, the photocatalytic activity of tungsten trioxide is suppressed if calcium, magnesium, carbonate and phosphate are present in the solution. At the same time, metal ions can also form complexes with humic acid which are more difficult to be degraded. The acid anions, however, reduce the photocatalytic activity due to the capture of hydroxyl radicals.

The study found that the pH value of tungsten oxide photocatalytic performance also has an important impact. For example, when photocatalytic degradation of rhodamine B with tungsten trioxide, the photocatalytic activity of rhodamine B is higher than that of rhodamine B under neutral or alkaline conditions when the pH of the system is acidic.

The pH of the degradation solution and the amount of hydrogen peroxide added also have different effects on the photocatalytic degradation of acid orange by tungsten trioxide. When the system pH> 3, the photocatalytic activity increases with the increase of the amount of hydrogen peroxide. The effect of different inorganic oxidants on the photocatalytic activity of tungsten trioxide is also very different. Compared with the addition of hydrogen sulfate, hydrogen peroxide, bromate and iodate, the photocatalytic activity of tungsten trioxide can be remarkably improved. The reason for the increase of the photocatalytic activity of tungsten trioxide due to the addition of iodate is that the carrier efficiency is improved.

The tungsten oxide photocatalytic process is affected by other substances present in the reaction system. Therefore, by controlling the composition of the photocatalytic reaction system, the progress of the photocatalytic reaction of tungsten oxide can also be promoted or hindered.

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