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Our company is the member companies of Photocatalysis Industry Association of Japan |
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First of all, a catalyst is that does not change in itself
for chemical reaction. It serves as speed up chemical
reactions or delays speed of a reaction for chemical manufacturing
process. There are various types of catalysts by making
chemicals. For example, the heat catalyst is used in order
to purify the exhaust gas of a car. And the enzyme that
is in the living body also serves as a kind of catalyst.
A photocatalyst is that causes a catalyst reaction by
light. There have several materials. As photocatalyst
the most using material is titanium dioxide (chemical
formula: TiO2). The titanium dioxide is color of white.
It
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Titanium
dioxide (powder condition)
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- The
photocatalyst is oxidized and broke down various organic
matters and change to CO2 and water. This process
needs only light. Therefore it chemical reaction is
less damaging to the environment and pollution-free
product.
- The
photocatalyst bring forth active oxygen. This active
oxygen is more high oxidative than sodium hypochlorite
or ozone. But active oxygen is very safety, because
it associative strength is very strong and quickly,
therefore it cannot swim in the air.
- Oxidative
of active oxygen combine with almost organic matters
materials.
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There can break anti-bacterial, dirt, etc
down into CO2 and water by the light energy,
and it can be used regardless of the interior
of a room and outdoor one, such as the self-cleaning
effect, the air purification effect, etc.
They are the environmental improvement goods
of great promise.
The photocatalyst reaction principle is
that break various organic matters down
into CO2 and water by active oxygen is existing
in the state like a film on the photocatalyst
coating surface where light is irradiated.
Detail of reaction
- There
generate electricity in the titanium dioxide
when it on illuminated the light. Titanium
dioxide is excitation state and hole (h+)
is generated when an electron (e-) is
intensified.
- An
electron is changed to superoxide anion
by oxygen and hole is changed to hydroxyl
radical by moisture in the air. There
is active oxygen.
- The
photocatalyst reaction principle is that
break various organic matters down into
CO2 and water by active oxygen (superoxide
anion and hydroxyl radical) is existing
in the state like a film on the photocatalyst
coating surface where light is irradiated.
- Made
up figure of organic substance has molecule
of bound of carbon and oxygen or molecule
of bound of carbon and hydrogen. Active
oxygen is combined with carbon or oxygen.
Therefore it takes off to cut molecular
bond of carbon and oxygen or carbon and
hydrogen.
- Active
oxygen oxidized power is stronger than
sodium hypochlorite or ozone. But it broke
out from photocatalyst cannot has a place
in the air, because it change to CO2 and
water very quickly. It is running reaction
various substance in the air. Therefore
it cannot takes in human body and does
not pool a sealed room.
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- Used
by Photocatalyst is a titanium dioxide (chemical formula:
TiO2). It is insoluble ceramic.
- Titanium
dioxide has been using as food additive since 1968
in US and 1983 in Japan.
- And
it is using for various industrial materials as color
pigment into beauty product, paint, colorant, etc
in the world.
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