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1.
Sterilizing Effect
Photocatalyst does not only kill bacteria cells, but
also decompose the cell itself. The titanium dioxide
photocatalyst has been found to be more effective
than any other antibacterial agent, because the photocatalytic
reaction works even when there are cells covering
the surface and while the bacteria are actively propagating.
The end toxin produced at the death of cell is also
expected to be decomposed by photocatalytic action.
Titanium dioxide does not deteriorate and it shows
a long-term anti-bacterial effect. Generally speaking,
disinfections by titanium oxide is three times stronger
than chlorine, and 1.5 times stronger than ozone.
Fig-1 Function of Photocatalyst
2.
Deodorizing Effect
On the deodorizing application, the hydroxyl radicals
accelerate the breakdown of any Volatile Organic Compounds
or VOCs by destroying the molecular bonds. This will
help combine the organic gases to form a single molecule
that is not harmful to humans thus enhance the air
cleaning efficiency. Some of the examples of odor
molecules are: Tobacco odor, formaldehyde, nitrogen
dioxide, urine and fecal odor, gasoline, and many
other hydro carbon molecules in the atmosphere.
Air purifier with Ti02 can prevent
smoke and soil, pollen, bacteria, virus and harmful
gas as well as seize the free bacteria in the air
by filtering percentage of 99.9% with the help of
the highly oxidizing effect of photocatalyst (Ti02).
3.
Air Purifying Effect
The photocatalytic reactivity of titanium oxides can
be applied for the reduction or elimination of polluted
compounds in air such as NOx, cigarette smoke, as
well as volatile compounds arising from various construction
materials. Also, high photocatalytic reactivity can
be applied to protect lamp-houses and walls in tunneling,
as well as to prevent white tents from becoming sooty
and dark. Atmospheric constituents such as chlorofluorocarbons
(CFCs) and CFC substitutes, greenhouse gases, and
nitrogenous and sulfurous compounds undergo photochemical
reactions either directly or indirectly in the presence
of sunlight. In a polluted area, these pollutants
can eventually be removed.
Fig-2 Applications of
photocatalyst air purification
4.
Anti fogging, Self-Cleaning
Most of the exterior walls of buildings become soiled
from automotive exhaust fumes, which contain oily
components. When the original building materials are
coated with a photocatalyst, a protective film of
titanium provides the self-cleaning building by becoming
antistatic, super oxidative, and hydrophilic. The
hydrocarbon from automotive exhaust is oxidized and
the dirt on the walls washes away with rainfall, keeping
the building exterior clean at all times.
5.
Water Purification
Photocatalyst coupled with UV lights can oxidize organic
pollutants into nontoxic materials, such as CO2
and water and can disinfect certain bacteria. This
technology is very effective at removing further hazardous
organic compounds (TOCs) and at killing a variety
of bacteria and some viruses in the secondary wastewater
treatment. Pilot projects demonstrated that photocatalytic
detoxification systems could effectively kill fecal
coli form bacteria in secondary wastewater treatment.
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