Nano particle size tungsten trioxide is a kind of material for preparing transparent thermal insulation nanopowder, which may be applied to heat-insulating glass in the form of heat-insulating film. This kind of film can block the infrared radiant energy of solar energy in the summer, and can block the far-infrared outflow of indoor heating in winter.
Tungsten trioxide is also a photocatalyst that can be used to characterize its photocatalytic properties by photocatalytic degradation of organic dyes. Sunlight exposure is easy to be influenced by the quality of the atmosphere of the day. In other words, solar radiation is unstable during the test, so that it is inconvenient to the contrast experiment. Therefore, the natural light is replaced by a xenon lamp whose color temperature is close to that of sunlight. In the experiment, organic pollutants such as Rhodamine B (carcinogenic) and methyl orange (which can cause sensitization) were selected as target degradation products.
In the photocatalytic degradation process, to study what kind of factor is involved, methanol or sodium oxalate is added to the system as a sacrificial agent for photogenerated holes, nitrogen or p-benzoquinone is added as a superoxide radical trapping agent, and isopropanol or dimethyl sulfoxide is used as a hydroxyl radical scavenger.
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