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Today the environment and human healthy suffered from
various contaminants, so a new technology of photocatalyst
from Japan has got attention extensively. The new product
has thorough antibacterial effects and doesn’t do social
effect of pollution, so it is called the most advanced antibacterial
and purifying technology for houses and cars in the world,
and enjoys popularity in the material industry. With the advance of human material civilization, human
has been puzzled by the pollution of exhaust gas of cars,
formaldehyde, benzene and mildew,
etc. Statistical data indicates that for every year over
100,000 people are killed by indoor pollution in China.
Indoor Air Detect Center of China Decorate Association has
checked up 200 new cars, about 90 percents have the problem
of baneful gas excessive. To find a new technology of depurating
environment is the goal that various countries scientists
are endeavoring for.
Professor Fujishima and his graduate student Honda discovered
the phenomenon below while did experiments in 1972: placed the
electrodes made from TiO2 and Pt in the water to
form a loop, it can decompose water into oxygen and hydrogen
exposing to light if only without electricity. Honda discovered
that TiO2 had strong oxidation ability, so he transferred
to study the effect of TiO2 in environmental protection
that is sterilization, deodorization and decontamination, etc.
The development of
photocatalyst:
The products of photocatalyst have been applied in Europe,
American, Japan and Korean for 5 years. Especially in Japan, they are applied
in various kinds of industries. The data of Japanese business market indicates,
after the first development about TiO 2 appeared in 1970, the
photocatalyst had been developed as commodity in 1990, trial-business reached
0.2 billion yen in 1997, 1.2 billion yen in 1998, 4 billion yen in 1999
and over 100 billion yen in 2001. The growing speed was striking and the
demand of present market is huge. The Japanese business agency boldly forecasted
that the production value of the related industries derived from applying
TiO 2 would reach over 100 billions ~ 500 billions yen. Only in
view of remarkable achievement in Japanese market, and the basic survival
condition of human being, the development of potential market will be unlimited.
TiO2 photocatalyst
principle:
Nanometer photocatalyst are made from TiO 2 grains,
the sizes of which are under 20nm. After they absorb UV in sunshine
and illuminate lamp-house, the electrons on them are activated
by UV and flies off, then produce electron holes, which have
strong oxidation ability (the holes are produced, when the electrons
are flying off). The electron has strong deoxidization ability,
will produce oxidation anion free radicals and oxyhydrogen free
radicals after reacting with H 20 and O 2
in air. They have strong oxidation ability, and can decompose
the organic, contaminants, fume, and bacteria into hurtles CO 2
and H 2O . At the same time, the electrons make deoxidization
reaction to deoxidize the oxygen in air.
[1]
TiO 2 photocatalyst principle:
[2]
1, Sterilization, restraining virus: TiO2
photocatalyst can destroy the membrane of the cell; solid the
protein of virus, restrain the virus activation, and catch,
kill aerobic bacteria up to 99.97%.
a. It can kill coliform, green suppuration
bacillus, golden grape coccus, mildew, suppuration fungus,
etc.
The ability of sterilization can be tested
through coliform and golden grape coccus. At the beginning,
there are 3.3x105
coliforms and 3.2x105
golden grape coccus. After 24 hours' reaction, there are only
10.
b. It can decompose anaphylactogen of air
and reduce anaphylactia and pant.
c. Restrain the virus, and can prevent it.
2,Removing the environmental
pollution:
a , The oxyhydrogen free radical produced
by TiO2 photocatalyst can destroy organic molecules
firstly and make it become single gas molecules, so it can
accelerate decomposing the organic and gas and advance the
efficiency of air cleaning.
b , TiO2 , photocatalyst has stronger
oxidation ability than ozone and anion, stronger absorbability
than active carbon, and has the efficacy (decomposing bacteria),
which the active carbon doesn't have. According to authoritative
laboratory test in Europe and America , the deodorization
ability is 150 times stronger than high-efficacy fiber active
carbon, equivalent to 500 active carbon refrigerator deodorant.
c , Photocatalyst has strong efficacy of preventing
mildew. The cloth packaged food utilizing photocatalyst can
obviously suppress going mould. It can keep fresh in 10 days.
According to the experiment, the efficacy spraying over 1000
square meters is equivalent to the air purifying ability of
70 silver birch. The world of photocatalyst is fresh and healthy
like nature.
d , It has strong efficacy of decomposing
formaldehyde, benzene, ammonia and other organics that are
discharged by fitment materials.
e , It can eliminate the contaminants such
as CO,SO2, NO and oxyhydrogen compound.
f , It can eliminate the smoke, garbage smell,
life smell effectively.
The function of purification: [3]
3 , Hydrophile and antipollution: We only need clean the object
using water when the dust on it which has been disposed by TiO2
. Because TiO2 have the ability of hydrophile and
decomposing the crease, the dust can fall down with water and
make sure the dust is difficult to attach, and make the appearance
clean.
The principle of Hydrophile [4]
4 , Defending UV : the character of absorbing
UV of TiO2 photocatalyst
makes the surface sprayed keep away from aging action, so
it has a longer using life.
5 , Keep away from rust and depigment
5Keep the metal away from rust, and
depigment.
The applications:
a, Room, sitting room, bedroom, kitchen,
furniture, decorate things
b, Hotel, the meeting room, the banquet hall,
pharmaceutical factory, food factory, market, cinema, the
internet café, the office building, the operating room
of hospital and the ward, the public place of entertainment,
the gymnasium.
c, All kinds of vehicles.
“ROOT” series photocatalyst
products include TiO2 power and plasm,
photocatalyst air purifier, nanometer Ag photocatalyst purifier,
photocatalyst indoor air purifier, photocatalyst cars' air
purifier, anion portable purifier, anion economize
purifying light. Our products adopt advanced technology.
Equivalent to other congener products, they have these traits
downwards:
a, New technology. Adopt modern high-tech nanometer technology.
Make TiO2 , nanometer Ag and Sio2
compound, and prepare a unique nanometer photocatalyst
material. It has strong redox ability that makes
it decompose various organic and inorganic matters. Simultaneously
it can keep on sterilizing for 24 hours without light.
b, High purity. The content of TiO2 in the
products = 98%. Adopt high purity and high dosage mulriple
photocatalyst filter. c, High efficacy. The sterilization rate of photocatalyst
air purifier reaches over 99%. The rate of deodorization
is 99%, and creates a fresh anion environment. It is nonpoisonous
and tasteless, and will not produce other contaminants
and radiation matters. It has persistence characteristic.
d, Pertinence. Customers can customize the
diameter of the TiO2 grains and append other materials
to suit their demands. and pertinence and efficiency of our
products are enlarged.
e, Popular and convenient. The products are
novel, small, convenient, and easy to take with. The scope
of application is extensive, including in the rooms, outdoors,
in cars, public and vehicles, etc.
f, Safe. The brief content is
TiO2 , it can use as food additive, was
approved through U.S.A. FDA. It has been extensively applied
in cosmetic, brightening agent, nonpoisonous white dye, and
it's very safe.
g, Persistence characteristic. Because TiO2
is steady, and only use as catalyzer, it can function forever
theoretically.
ROOT photocatalyst compares with other
air purifiers below:
Air purifier |
Theory |
Merit |
Deficiency |
Formaldehyde
catcher |
Spray or
brush the plies fitted up with formaldehyde catcher,
which is consumed as reacting with formaldehyde, producing
another chemical. But it cannot decompose the formaldehyde
molecules into innocuous substance, |
Eliminating
formaldehyde |
It just aims
at eliminating formaldehyde but benzene, ammonia and
TVOC. It cannot be used on walls, floor and sofas, and
the use is incomprehensive. The reactive time is short.
In general, it is only a simple means to meet an emergency. |
Air balmy
sorbent |
It is a volatile
chemical, which conceals bad air through volatilizing
special scent |
Make air
balmy |
A mixed gas
is produced which brings people good feeling and illusion,
but it cannot eliminate baneful gas. It must be used
frequently and brings body some blight at a long-term
use.
|
Active
carbon sorbent
|
It sorbs
big gas molecules and suspending grains owing to its
porous character, e.g. smoke, dust, etc. It purifies
air through forcing air to circulate by aerator. |
Can eliminate
smoke, dust, etc in air |
The filters
must be replaced termly, the efficiency is low and it
cannot deracinate the baneful gas.
|
Ozone sterilization |
Utilize air
circulation of air conditioner, send high density ozone
produced by automobile disinfector to each corner |
Won’t
remain any baneful material, and won’t produce the
second pollution |
There are
ozone smell in carriages after sterilization, and must
be used termly. |
Anion generator |
Increase
the anions of air. The anions can depress bacteria,
virus, and eliminate the smell, make the air clean |
Can depress
bacteria, virus, and eliminate the smell, make the air
clean |
Increase
the anions in the air make chauffeur’ mind sober,
but is helpless to eliminate the intrinsic contamination |
ROOT photocatalyst
|
Adopt nanometer
TiO2 as catalyst; produce active matters
by photocatalyst reaction in air. So it can clean the
air, be antibacterial, defend moudly |
It doesn’t
be consumed and declined along with the time, because
it doesn’t participate in redox directly as catalyst,
it will be efficient for long It can efficiently decompose
and eliminate all kinds of organic materials and partial
inorganic baneful gas, sterilize, deodorize, prevent
pollution etc. It creates a anion environment for people.
Using and taking are convenient. Chinese Technology
Association project institute approves the method.
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From the comparison above, we know that ROOT series products
have better capability and market potential.
Photocatalyst disposes of air pollution indoor most ideally,
downright, completely, efficiently and it has a bright market.
[1] From A. Fujishima and K. Honda:
238,37(1972)
[2], [3], [4] from Beijing Ntide Environmental Technology Inc.,
www.ntide.com:Photocatalyst Knowledge
We are grateful for the data. Thank you very much!
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