Light is a powerful force. It can bring life to plants when they cook with sunlight.
Many people don’t know that light can purify the air we breathe. This characteristic of light is used by some of the most recent air conditioners and purifiers to purify the air.
The photocatalytic filter is an example of where ultraviolet light acts in conjunction with a catalyst, titanium dioxide, to purify the air.
Photocatalytic filter Principle and working
Simply put, ultraviolet light shines on a catalyst, titanium dioxide, and breaks down the water molecules in the air to combine them with impurities.
Let’s take a look at the operation of the photocatalytic filters in detail.
The filter emits electrons by letting ultraviolet light shine through a thin layer of titanium dioxide. These electrons react with water molecules (H2O), which are present in the air, to form highly reactive hydrogen ions (OH).
These hydroxyl ions combine with carbon in organic pollutants to convert them into water and Carbon dioxide (CO2). This is an example of classic oxidation.
This method of purifying air is also called Photocatalytic Oxidation or PCO.
What’s the role of titanium dioxide in this?
Titanium dioxide acts as a catalyst, accelerating the reaction without actually taking part. This technology doesn’t require large amounts of titanium dioxide. It is sufficient to coat the substrate with a thin layer of the compound.
Photocatalytic filters – For use in air purifiers or air conditioners
These filters can be used as an addition to HEPA filters or other filters in air conditioners and purifiers. This technology is used in the latest Daikin air conditioners to complement their other filtration methods.
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