AIR PLOT

(1) Why does an allergic reaction occur?

An allergic reaction occurs when the immune system attacks an “allergen” that gains access to the body. A substance that causes an allergic reaction is called “allergen”. Pollens (ragweed, grasses, and trees), animal protein, house dust, mold spores, and mites are considered as “allergen”.

It is very important to create and ensure a good clean air environment of a room!!An adult is said to inhale approximately 20Kg (44lb.) of air and 2Kg (4.4 lb.) of food every day.

Air

approx. 20Kg (44lb.)
Air inhaled through the lungs goes directly into the blood system, and then reaches to the central nervous system.
There is no detoxification process to take place in this case.

Food and water
approx. 2Kg (4.4 lb.)
In case of food, when a harmful food is taken to the body, some degree of detoxification takes place in the liver.

(2) What is Photocatalysis?

When a photocatalysis absorbs ultraviolet rays (UV) either from sun or fluorescent light, it forms activated oxygen which is strong enough to oxidize and decompose organic matters or smelling gas, and kill bacteria. This process is similar to photosynthesis, in which chlorophyll captures sunlight to turn water and carbon dioxide into oxygen and glucose.

Main functions of photocatalysis
1 Air purification: Elimination of harmful substances of room air such as NOx, SOx, formaldehyde, and etc.
2 Deodorizing: Deoxidization of Volatile Organic Compounds (VOCs), such as formaldehyde, tobacco order, NOx, urine and fecal order, gasoline, and etc.
3 Water treatment: Decomposition and removal of water contaminants such as Tetra-ethyren-chlorides, Tri-cloro- ethylene, and etc.
4 Anti-Bacteria: Prevention of bacteria and mold growth
5 Anti-soiling: Prevention of dirtiness of building exterior

How does Photocatalyst work?

Photocatalyst is a substance which speeds up a chemical reaction but does not change itself during the process. When photocatalyst titanium dioxide (TiO2) absorbs Ultraviolet (UV) rays from sunlight or fluorescent lamps, it produces powerful oxidizing reactions to decompose harmful organic compounds. Titanium dioxide is considered a safe substance and harmless to human. AIR PLOT (an alloy of titanium dioxide and platinum) produces much stronger oxidizing reaction comparing to the other photocatalysts

Mechanism
Titanium dioxide (TiO2) as photocatalyst acts like a semiconductor. It consists of the conduction band, the valence band and the forbidden band as shown in the Fig. 1.
When UV rays are not applied:
Valence band: With electrons
Forbidden band: No electron
Conduction band: No electron

The electron of the valence band of TiO2 becomes exited when illuminated by UV ray whose wavelength is shorter than 400 nm (Nano meter). The excess energy of this electron promotes the electron to the conduction band, creating the negative-electron (e^-) and positive-hole (p⁺) pair as in Fig. 2.

The negative electron (e^-) reacts with Ti⁴⁺ of titanium dioxide and becomes Ti³⁺ (Ti⁴⁺ - e^-).
The positive-hole (p+) reacts with oxygen (O^2-) on the surface of titanium dioxide and becomes O^- (O^2- - P⁺).

Why is Ultraviolet ray necessary for activating titanium dioxide?

The energy difference between the valence and the conduction bands is known as the band gap. The band gap of Anatase type titanium dioxide is 3.23 eV (electron Voltage). Wavelength of the light necessary for photo-excitation is 383.9 nm.
1240(Plank’s constant)/3.23 eV(band gap energy)= 383.9 nm.
As the wavelength of ultraviolet ray is less than 400 nm, UV is necessary for titanium dioxide to act as photocatalyst.

Reaction of the negative-electron (e^-)

As shown in Fig. 3, if the negative electron (e^-) reacts with oxygen (O₂) in the air, super oxide anion (O^2-) is formed. And, if reacts with hydrogen anion, hydrogen atom (H) is formed.

Reaction of the positive-hole (P⁺)

As shown in Fig. 4, the positive-hole (P⁺) reacts with oxygen (O^2-) on the surface of titanium dioxide and becomes Oor O₃^-.

Effects

The above formed O-, O2-, O3-, O, and OH have a powerful oxidizing power and cause various reactions. Utilizing the oxidation strength of hydroxyl radicals, photocatalyst can produce the effects of disinfections, deodorization, air and water purification, etc.

Home Photocatalyst AIR PLOT F.A.Q. Contact Us Company Partnership


It is very important to create and ensure a good clean air environment of a room!!An adult is said to inhale approximately 20Kg (44lb.) of air and 2Kg (4.4 lb.) of food every day.
	Air approx. 20Kg (44lb.)	Air inhaled through the lungs goes directly into the blood system, and then reaches to the central nervous system. There is no detoxification process to take place in this case.
	Food and water approx. 2Kg (4.4 lb.)	In case of food, when a harmful food is taken to the body, some degree of detoxification takes place in the liver.

	(1) Why does an allergic reaction occur?


	An allergic reaction occurs when the immune system attacks an “allergen” that gains access to the body. A substance that causes an allergic reaction is called “allergen”. Pollens (ragweed, grasses, and trees), animal protein, house dust, mold spores, and mites are considered as “allergen”.



	(2) What is Photocatalysis?
	When a photocatalysis absorbs ultraviolet rays (UV) either from sun or fluorescent light, it forms activated oxygen which is strong enough to oxidize and decompose organic matters or smelling gas, and kill bacteria. This process is similar to photosynthesis, in which chlorophyll captures sunlight to turn water and carbon dioxide into oxygen and glucose.
	Main functions of photocatalysis 1 Air purification: Elimination of harmful substances of room air such as NOx, SOx, formaldehyde, and etc. 2 Deodorizing: Deoxidization of Volatile Organic Compounds (VOCs), such as formaldehyde, tobacco order, NOx, urine and fecal order, gasoline, and etc. 3 Water treatment: Decomposition and removal of water contaminants such as Tetra-ethyren-chlorides, Tri-cloro- ethylene, and etc. 4 Anti-Bacteria: Prevention of bacteria and mold growth 5 Anti-soiling: Prevention of dirtiness of building exterior

	How does Photocatalyst work?
	Photocatalyst is a substance which speeds up a chemical reaction but does not change itself during the process. When photocatalyst titanium dioxide (TiO2) absorbs Ultraviolet (UV) rays from sunlight or fluorescent lamps, it produces powerful oxidizing reactions to decompose harmful organic compounds. Titanium dioxide is considered a safe substance and harmless to human. AIR PLOT (an alloy of titanium dioxide and platinum) produces much stronger oxidizing reaction comparing to the other photocatalysts
	Mechanism Titanium dioxide (TiO2) as photocatalyst acts like a semiconductor. It consists of the conduction band, the valence band and the forbidden band as shown in the Fig. 1. When UV rays are not applied: Valence band: With electrons Forbidden band: No electron Conduction band: No electron

	The electron of the valence band of TiO2 becomes exited when illuminated by UV ray whose wavelength is shorter than 400 nm (Nano meter). The excess energy of this electron promotes the electron to the conduction band, creating the negative-electron (e^-) and positive-hole (p⁺) pair as in Fig. 2.

	The negative electron (e^-) reacts with Ti⁴⁺ of titanium dioxide and becomes Ti³⁺ (Ti⁴⁺ - e^-). The positive-hole (p+) reacts with oxygen (O^2-) on the surface of titanium dioxide and becomes O^- (O^2- - P⁺).


	Why is Ultraviolet ray necessary for activating titanium dioxide?
	The energy difference between the valence and the conduction bands is known as the band gap. The band gap of Anatase type titanium dioxide is 3.23 eV (electron Voltage). Wavelength of the light necessary for photo-excitation is 383.9 nm. 1240(Plank’s constant)/3.23 eV(band gap energy)= 383.9 nm. As the wavelength of ultraviolet ray is less than 400 nm, UV is necessary for titanium dioxide to act as photocatalyst.

	Reaction of the negative-electron (e^-)
	As shown in Fig. 3, if the negative electron (e^-) reacts with oxygen (O₂) in the air, super oxide anion (O^2-) is formed. And, if reacts with hydrogen anion, hydrogen atom (H) is formed.



	Reaction of the positive-hole (P⁺)
	As shown in Fig. 4, the positive-hole (P⁺) reacts with oxygen (O^2-) on the surface of titanium dioxide and becomes Oor O₃^-.



	Effects
	The above formed O-, O2-, O3-, O, and OH have a powerful oxidizing power and cause various reactions. Utilizing the oxidation strength of hydroxyl radicals, photocatalyst can produce the effects of disinfections, deodorization, air and water purification, etc.