Tungsten oxide (WO3) can generate reactive oxygen species (ROS) under light, including oxygen free radicals and superoxide ions. The generation of these ROS is closely related to the photocatalytic properties of tungsten oxide.
When tungsten oxide is exposed to light, the energy of photons is absorbed, causing electrons to transition from the valence band to the conduction band, forming electron-hole pairs. These carriers (electrons and holes) can participate in surface reactions, including redox reactions and water splitting.
In the photolysis reaction of water, electrons on the conduction band of tungsten oxide can be transferred to oxygen molecules to generate active oxygen species oxygen free radicals (O•). These oxygen free radicals have high oxidizing ability and can react with substances such as organic pollutants to promote their decomposition or oxidation.
In addition, tungsten oxide may also generate superoxide ions (O2•-) as another ROS. Superoxide ions are formed by the combination of electrons and oxygen molecules, and have strong oxidizing ability.
The generation of these ROS is closely related to the energy band structure of tungsten oxide, light intensity and environmental conditions and other factors. The higher the light intensity, the number of ROS produced by tungsten oxide may increase.
It is worth noting that the generation of ROS is an important manifestation of the photocatalytic activity of tungsten oxide, but at the same time, attention should be paid to its possible environmental and health effects. High concentrations of ROS may cause certain oxidative damage to the surrounding environment and organisms.
In summary, tungsten oxide can generate reactive oxygen species (ROS), including oxygen radicals and superoxide ions, under light conditions. These ROS have strong oxidation ability and can participate in oxidation reactions and decomposition of organic matter and other applications. However, further studies and evaluations are needed for ROS generation and control in specific applications and environments.
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