Detailed explanation of several different technical properties commonly used in purification equipment

I. Electrostatic purification technology: This method works on the principle that the tungsten wire in the electrostatic precipitator undergoes a continuous release of high voltage electrostatic charge, which makes the dust and bacteria in the air all positively charged and then adsorbed by the negative electrode plate, it filters dust, smoke and other pollution smaller than cells.
The advantages are that it is relatively simple to use, does not need to be replaced frequently, is not very expensive, and is more effective in preventing colds and various infectious diseases.
The disadvantage is that special tools are needed for cleaning, and if used improperly it is easy to catch fire.

II. Photocatalytic technology: this technology is the air through the photocatalytic air purification device, photocatalyst in the role of light itself does not change but can promote the chemical nature of the substances, such as harmful substances in the air such as formaldehyde, and benzene, etc., so that the role of photocatalytic degradation, into non-toxic and harmless substances, to play a purifying effect on the air.
Its disadvantage is that it must be carried out in the case of low airflow, the speed of purification is also relatively slow, relatively easy to fail, and requires frequent cleaning.

III. Activated carbon technology: I believe that no one is unfamiliar with activated carbon technology, which is a porous charcoal-containing substance with an infinitely developed pore structure, providing a huge surface area for the whole to make full contact with the gas, thus giving activated carbon powerful adsorption properties, just like magnetic attraction, making all the molecules gravitate towards each other and collide, thus removing pollution.
However, its disadvantage is also relatively obvious, that is, it cannot adsorb all toxic gases, the efficiency of adsorption is relatively low, easy to desorption.

IV. HEPA filter: HEPA filter is also commonly known as a high-efficiency air filter, it has a 99.999% filtration effect for particles below 0.3 microns, characterized by any air that can pass, but only fine particles can not pass.
HEPA technology has both high precision and high wind efficiency, but these two points can not coexist, what is the reason?

Because the higher the precision of the filter paper is, the better because it can block the finer pollutants, such as dust, powder, etc.
But the current fine filter paper, cannot block viruses and bacteria, because both are much smaller than the precision of the filter paper; and blocking bacteria is not the same as killing bacteria, so if the bacteria is blocked it is likely to be concentrated on the filter paper as a result.
The so-called blocking in other words is blocking, where the more precise the filter paper is the easier it is to block, and blocking will cause a reduction in airflow, thus making the effect of purification greatly reduced, and even producing side effects.

V. Negative ion technology: negative ion technology is the use of a certain concentration of negative air ions to purify the air because negative ions can easily interact with the air in the small pollution particles, become charged large ions, precipitate on the ground, and other surface materials, so that the air is purified accordingly.
This technology can be more effective in removing dust from the air, but also easy to make the dust adsorbed on the wallpaper and glass, which can not be removed from the room.

VI. Ozone technology: ozone is composed of molecules, i.e. three oxygen atoms, which are chemically unstable, and if they encounter pollutants in the air they will immediately "rush" towards the polluting particles and subsequently cause an "explosion", thus eliminating the airborne pollutants.
This makes ozone a relatively efficient disinfectant, but its high concentrations can be harmful to humans, so ozone technology should only be used in an unoccupied environment.