Tungsten Oxide Photocatalyst Dye Sensitization

Tungsten oxide photocatalyst dye sensitization process, is the use of dyes and other materials that can absorb visible light. Tungsten oxide modified surface is to broaden the optical response of tungsten oxide photocatalyst range. Thereby increasing light utilization and increasing photocatalytic activity.

The dye sensitization process of the tungsten oxide photocatalyst includes modifying the dye on the surface of the tungsten oxide photocatalyst. As the dye is excited by visible light, it will form singlet or triplet state. At this point the electrons on the dye become excited electrons, so that the excited state electrons are transferred to the conduction band of the semiconductor and undergo a reduction reaction with oxygen-containing receptors on the surface. Finally produce reactive oxygen species, which can react with the target photocatalytic.

Under the irradiation of visible light, the dye-sensitized tungsten oxide material shows more excellent hydrogen production activity. This indicates that dye sensitization can increase the spectral response of the tungsten oxide photocatalytic material and increase its photocatalytic activity. This is due to the photo-excited electrons being able to efficiently transfer from the dye to the tungsten oxide photocatalyst.

Some scholars also use copper phthalocyanine to sensitize bismuth molybdate and use it for photocatalytic degradation of rhodamine B and phenol. Under simulated solar irradiation, the sensitized bismuth molybdate improved the photocatalytic activity of rhodamine B even though it only slightly increased the degradation of phenol. Under the irradiation of 620 nm monochromatic light, the research on bismuth molybdate sensitized to degrade 91% rhodamine B, while the non-sensitized bismuth molybdate has almost no degradation effect. From the above study shows that the dye sensitization mainly by the dye and tungsten oxide photocatalyst interaction and its stability is closely related.

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