Fenton air purification system

Abstract

The invention provides a Fenton air purification system, which comprises a shell, a reaction tank, a first light source, a storage tank and a first ventilation device; wherein the shell surrounds the reaction tank, the first light source and the first ventilation device, and the shell has an inlet hole and an outlet hole; the reaction tank accommodates an iron reactant solid; the first light source provides ultraviolet light C and illuminates the iron reactant solid; and the storage tank is connected to the reaction tank and accommodates a hydrogen peroxide solution for supplying to the reaction tank. The invention utilizes the Fenton reaction to produce hydroxyl radicals, which are released into the air and can be harnessed to remove harmful substances such as volatile organic compounds in the air through hydroxyl radical-mediated oxidation reactions.

Description

[0001] FENTON AIR PURIFICATION SYSTEMBACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The present invention relates to a Fenton air purification system, especially utilizing Fenton reaction to produce hydroxyl radicals, which are released into the air to remove harmful substances such as volatile organic compounds in the air through hydroxyl radical-mediated oxidation reactions.

[0004] 2. Description of the Prior Arts

[0005] Volatile organic compounds (VOCs) are organic compounds that easily evaporate or become gaseous at normal temperatures and pressures. Common VOCs comprise formaldehyde, benzene, toluene, xylene, acetone, methanol, ethanol, ether, methylene chloride, methane, butadiene, ethylene glycol and diethylene glycol, etc. The outdoor sources of VOCs comprise waste gases from industries and vehicles, and the indoor sources of VOCs comprise cooking fumes, detergents, pesticides, paints, coating materials and adhesives, etc.

[0006] VOCs can damage the human nervous system, brain, liver and kidneys, and can cause nausea, headaches, limb weakness and memory deterioration. Even worse, some VOCs are carcinogens. Therefore, how to remove VOCs effectively is an important issue.

[0007] Traditionally, the industry removes VOCs by combustion. However, a long-term operation of combustion furnace results in a high cost, and is hard to be widely accepted and maintained in work places and home where people stay for a long time. Therefore, VOCs removal methods that better meet consumers’needs still need to be developed.

[0008] SUMMARY OF THE INVENTION

[0009] To solve the aforementioned problems, the present invention provides a Fenton air purification system, comprising: a shell, a reaction tank, a first light source, a storage tank and a first ventilation device; wherein

[0010] the shell surrounds the reaction tank, the first light source and the first ventilation device;

[0011] the shell has an inlet hole and an outlet hole, the inlet hole is in gas communication with the outlet hole, and the first ventilation device is adjacent to the inlet hole or the outlet hole;

[0012] the reaction tank accommodates an iron reactant solid;

[0013] the first light source provides ultraviolet light C and illuminates the iron reactant solid; and

[0014] the storage tank is connected to the reaction tank and accommodates a hydrogen peroxide solution for supplying to the reaction tank.

[0015] Fenton reaction is Fe2:+ H2O2 — * Fe3” + *OH + OH" (k = 76 M ’S"1)- First, as a pioneer, the present invention demonstrates that the hydroxyl radicals produced by Fenton reaction can be released from the hydrogen peroxide solution into the air. Through the first ventilation device, hydroxyl radicals pass through the holes of the shell and are scattered to the external environment for removing harmful substances such as volatile organic compounds in the air through hydroxyl radical-mediated oxidation reactions. Second, Fenton-likereaction is Fe3++ H2O2→ Fe2++ •OOH + H+(k = 0.01 M-1S-1), which has a reaction rate significantly slower than that of Fenton reaction. Therefore, the present invention provides a first light source to illuminate the hydrogen peroxide solution and the iron reactant solid, so that ultraviolet light C from the first light source can increase the reaction rate of Fenton-like reaction and ensure Fe2+ / Fe3+cycles, thereby greatly reducing the trouble to frequently renew the iron reactant solids. Further, the hydrogen peroxide solution is a consumable, so the storage tank is provided and connected to the reaction tank to supply the hydrogen peroxide solution to the reaction tank and maintain the process of Fenton reaction. In other words, the Fenton air purification system of the present invention can continuously generate hydroxyl radicals for 24 hours a day to effectively remove VOCs, and is suitable for working environments in the factory or office, or the environments at home.

[0016] In one embodiment, the shell also surrounds the storage tank.

[0017] Preferably, the storage tank is adjacent to the bottom of the shell. More preferably, the storage tank is below the reaction tank.

[0018] In one embodiment, the storage tank is provided outside the shell, and connected to the reaction tank by a pipe passing through the shell.

[0019] In one embodiment, the first light source is a light emitting diode. In one embodiment, the ultraviolet light C has a wavelength of 200 nm to 280 nm, such as: 200 nm, 240 nm, 260 nm or 280 nm. Preferably, the ultraviolet light C has a wavelength of 240 nm to 270 nm. More preferably, the ultraviolet light C has a wavelength of 250 nm to 258 nm. Further preferably.the ultraviolet light C has a wavelength of 254 nm. According to the present invention, the ultraviolet light C can accelerate the reaction rate of the Fenton¬ like reaction. Further, according to the present invention, the ultraviolet light C with the wavelength 180 nm or below will result in ozone production problems, and the ultraviolet light C within said wavelength range of the present invention will not produce ozone and other harmful derivatives.

[0020] In one embodiment, the first light source is disposed above or inside the reaction tank. Preferably, the first light source is accommodated in a transparent case. More preferably, the first light source in the transparent case is disposed above and adjacent to the liquid level of the hydrogen peroxide solution, or the first light source in the transparent case is disposed between the liquid level of the hydrogen peroxide solution and the iron reactant solid.

[0021] The transparent case helps to keep out hydroxyl radicals, hydrogen peroxide gases and the hydrogen peroxide solution. Further, shortening the distance between the first light source and the iron reactant solid can increase the reaction rate of Fenton-like reaction to maintain Fe2+ / Fe3+cycles.

[0022] In one embodiment, the storage tank is in fluid communication with the reaction tank.

[0023] In one embodiment, a first liquid level sensor is connected to the reaction tank for detecting a low liquid level in the reaction tank, wherein the low liquid level indicates a liquid level that requires replenishing hydrogen peroxide solution. That is, when the liquid level of the hydrogen peroxide solution in the reaction tank drops to said low liquid level, the first liquid levelsensor sends a signal to initiate replenishing the hydrogen peroxide solution, so that the reaction tank is filled with sufficient hydrogen peroxide solution at all times.

[0024] In one embodiment, a second liquid level sensor is connected to the reaction tank for detecting a high liquid level in the reaction tank, wherein the high liquid level indicates a liquid level that stops replenishing hydrogen peroxide solution. That is, when the liquid level of the hydrogen peroxide solution in the reaction tank rises to said high liquid level, the second liquid level sensor sends a signal to stop replenishing the hydrogen peroxide solution.

[0025] In one embodiment, the first liquid level sensor, the second liquid level sensor or a combination thereof is a contactless sensor. Preferably, the contactless sensor comprises an infrared liquid level sensor. In other words, the first liquid level sensor, the second liquid level sensor or a combination thereof does not contact the hydrogen peroxide solution, thereby preventing the first liquid level sensor, the second liquid level sensor or a combination thereof from shortening the service life due to the hydrogen peroxide.

[0026] In one embodiment, the first liquid level sensor, the second liquid level sensor or a combination thereof is connected to a pump. Preferably, the first liquid level sensor, the second liquid level sensor or a combination thereof is connected to a control element, and the control element is connected to a pump. More preferably, the pump comprises a peristaltic pump.

[0027] In one embodiment, the pump is connected to the reaction tank and the storage tank, so that the hydrogen peroxide solution in the storage tank can bedelivered to the reaction tank.

[0028] In one embodiment, the iron reactant solid comprises multiple beads. Preferably, the beads are iron beads.

[0029] In one embodiment, the iron reactant solid is disposed to directly contact a bottom of the reaction tank or the iron reactant solid is disposed at a position spaced from the bottom of the reaction tank.

[0030] In one embodiment, the beads are dispersed in multiple planes, and each of the planes comprises multiple through holes. Preferably, the planes are spaced apart from each other at intervals in the direction of gravity. More preferably, beads at different planes are spaced apart from each other at intervals.

[0031] For example, the plane is a bottom surface of a basket, and the reaction tank is provided with multiple stacked baskets, thereby forming multiple planes, wherein each basket has multiple through holes, and each basket is paved with a single layer of beads. Preferably, one bead is placed on one through hole on the inner bottom surface of the basket in a one-to-one manner, and the bottom of the basket has a mesh or a lattice-like structure.

[0032] Preferably, the through hole has a diameter smaller than the average diameter of the beads. Preferably, the diameter of the through hole and the average diameter of the beads have a ratio of 0.4 to 0.6: 1. Preferably, the diameter of the through hole and the average diameter of the beads have a ratio of 0.5 : 1.According to the present invention, the arrangement of the iron reactant solids which are spaced apart at intervals in layers can increase the reaction rate of Fenton reaction effectively.

[0033] In one embodiment, the basket is a mesh basket. Preferably, the basket is a flat bottom mesh basket. More preferably, the bottom of the basket is provided with brackets.

[0034] In one embodiment, the basket is connected to the reaction tank.

[0035] Preferably, the basket is connected to the reaction tank in a detachable manner. More preferably, the basket is hung on or engaged with the reaction tank. For example, the basket is provided with a detachable hook, and the detachable hook can be fixed on the wall of the reaction tank, or the basket is provided with a detachable telescopic engaging structure, and the detachable telescopic engaging structure can be fixed on the wall of the reaction tank.

[0036] In one embodiment, the basket is connected to a lifting device. The present invention uses the lifting device to adjust the height of the basket in the reaction tank in order to adjust the distance between the iron reactant solid and the first light source, thereby adjusting the reaction rate of Fenton reaction.

[0037] In one embodiment, the iron reactant solid is a single block. Preferably, the iron reactant solid is a single iron block.

[0038] The iron reactant solid is connected to the reaction tank in a vertically movable manner. Preferably, the single block is connected to the reaction tank through a lifting device. The present invention increases the reaction rate of Fenton- like reaction by bringing the iron reactant solid closer to the lightsource.

[0039] In one embodiment, the iron reactant solid comprises pure ferrous iron, low carbon steel, zero-valent iron, magnetite (Fe3O4) or a combination thereof. Preferably, the iron reactant solid is pure ferrous iron. The pure ferrous iron indicates a high purity ferrous iron.

[0040] In one embodiment, the iron reactant solid comprises iron beads or an iron block after rust thereon was removed. The rust is reddish brown.

[0041] Preferably, the iron beads or the iron block after rust thereon was removed are black or dark bluish gray.

[0042] In one embodiment, based on a total surface area of a single iron bead or an iron block after rust thereon was removed, the surface area with a color of reddish-brown is less than 1%. Preferably, based on a total surface area of a single iron bead or an iron block after rust thereon was removed, the surface area with a color of reddish-brown is less than 0.1%.

[0043] In one embodiment, the shell has an inner wall surface and an outer wall surface opposite to each other, wherein the inner wall surface faces the reaction tank. The reaction tank has an inner tank wall surface and an outer tank wall surface opposite to each other, wherein the inner wall surface of the shell, the outer tank wall surface of the reaction tank or a combination thereof is provided with a photocatalyst coating. The inner wall surface of the shell, the outer tank wall surface of the reaction tank or a combination thereof is provided with a second light source, wherein the second light source provides ultraviolet light C.Preferably, the photocatalyst coating is made of a material selected from a group consisting of titanium dioxide (TiO2), zinc oxide (ZnO), tungsten trioxide (WO3), bismuth vanadium oxide (BiVO4), graphitic carbon nitride (g-C3N4) and cadmium sulfide (CdS). More preferably, the photocatalyst coating is a titanium dioxide coating.

[0044] In one embodiment, the photocatalyst coating is a nano coating. That is, the photocatalyst coating is made of nanoparticles.

[0045] In one embodiment, the second light source is a light emitting diode. Preferably, the second light source has a wavelength the same as that of the first light source. According to the present invention, the ultraviolet light C within said wavelength range can increase the removal rate of hydrogen peroxide effectively.

[0046] In the present invention, the illumination of ultraviolet light C on the photocatalyst coating can effectively remove hydrogen peroxide escaping from the reaction tank and / or the storage tank to prevent hydrogen peroxide from entering the ambient environment.

[0047] In one embodiment, there is an airflow in a space surrounded by the shell, and an airflow direction is the same with, opposite to or perpendicular to the direction of gravity.

[0048] In one embodiment, the shell has multiple inlet holes or multiple outlet holes. The inlet holes or the outlet holes surround the reaction tank, the storage tank or a combination thereof. Preferably, the outlet holes surround the storage tank, not the reaction tank, to further reduce the risk of hydrogen peroxidescattering to the ambient environment.

[0049] In one embodiment, the airflow direction is the same with the direction of gravity. Specifically, the inlet holes are provided at the top of the shell, and the first ventilation device, the first light source, the reaction tank and the storage tank are sequentially provided in the direction the same with the direction of gravity. Further, the outlet holes surround the storage tank.

[0050] In one embodiment, the airflow direction is opposite to the direction of gravity; Specifically, the outlet holes are provided at the top of the shell, and the first ventilation device, the first light source, the reaction tank and the storage tank are sequentially provided in the direction the same with the direction of gravity. Further, the inlet holes surround the storage tank.

[0051] In one embodiment, the airflow direction is perpendicular to the direction of gravity. Specifically, the inlet hole, the reaction tank and outlet hole are sequentially provided in the direction perpendicular to gravity or a horizontal direction. Preferably, the shell tapers toward the inlet hole and the outlet hole respectively.

[0052] In one embodiment, the Fenton air purification system of the present invention further comprises a second ventilation device, and the reaction tank is disposed between the first ventilation device and the second ventilation device. Preferably, the second ventilation device comprises a fan. More preferably, the first ventilation device is adjacent to the inlet hole, and the second ventilation device is adjacent to the outlet hole. The present invention provides the first ventilation device and the second ventilation device to effectively guide the airflow into and out of the Fenton air purification system in order to improve the delivering efficiency of hydroxyl radicals from the reaction tank into the ambient air. Besides, when the Fenton air purification system is used in large spaces such as factories, the second ventilation device is particularly important to improve the delivering efficiency of hydroxyl radicals for increasing and maintaining the removal rate of hazardous substances such as volatile organic compounds.

[0053] In one embodiment, the Fenton air purification system of the present invention further comprises an air supply device connected to the reaction tank. Preferably, the reaction tank has a side wall protruding outward to form a buffer space. More preferably, the air supply device has a blowing hole connected to a top of the reaction tank, and the blowing hole is disposed toward the buffer space. The present invention provides the air supply device to effectively improve the delivering efficiency of hydroxyl radicals from the reaction tank into the ambient air. Besides, when the Fenton air purification system is used in large spaces such as factories, the air supply device is particularly important to improve the delivering efficiency of hydroxyl radicals for increasing and maintaining the removal rate of hazardous substances such as volatile organic compounds.

[0054] In one embodiment, the side wall of the reaction tank is a wall body between the inner tank wall surface and the outer tank wall surface. Preferably, the side wall of the reaction tank partially protrudes outward. More preferably, the side wall of the reaction tank protrudes outward, and the outline area of thetop of the reaction tank is greater than that of the bottom of the reaction tank. In other words, the side wall of the reaction tank does not protrude over the entire surface of the side wall of the reaction tank, and only the part adjacent to the top of the side wall of the reaction tank protrudes outward.

[0055] In one embodiment, the air supply device comprises a blower.

[0056] In one embodiment, the Fenton air purification system of the present invention further comprises a cooling device, a heating device or a combination thereof, and the cooling device, the heating device or a combination thereof is connected to the reaction tank. The cooling device can reduce the temperature of the hydrogen peroxide solution in the reaction tank to stop the Fenton reaction. The heating device can increase the temperature of the hydrogen peroxide solution in the reaction tank to accelerate the Fenton reaction. The present invention can control the production efficiency of hydroxyl radicals effectively through the cooling device and the heating device.

[0057] In one embodiment, the cooling device comprises a cooler, and / or the heating device comprises a heater. Preferably, the heating device provides a heating temperature of from higher than room temperature to 65°C, such as 15°C, 20°C, 25°C, 30°C, 35°C, 40°C, 45°C, 50°C, 55°C, 60°C or 65°C. The present invention can produce hydroxyl radicals at room temperature, or appropriately increase the temperature to increase the reaction rate of the Fenton reaction.

[0058] In one embodiment, a top of the reaction tank is provided with a ventilating hole and a switch mechanism, and the switch mechanism ismovable to open or close the vent. When the Fenton air purification system of the present invention is turned off, the switch mechanism will close the vent. For example, the switch mechanism comprises a cover, which covers or seals the ventilating hole to prevent hydrogen peroxide gas from evaporating into the ambient air, when the Fenton air purification system of the present invention is turned off. Preferably, the ventilating hole is disposed toward the ventilating tube.

[0059] In one embodiment, the Fenton air purification system of the present invention further comprises an exhaust channel in gas communication with the second ventilation device; wherein the exhaust channel is provided with a photocatalyst coating and a third light source, and the third light source provides ultraviolet light C and illuminates the photocatalyst coating.

[0060] Preferably, the exhaust channel is curved, such as having a spiral structure. The present invention significantly increases the production of hydroxyl radicals by increasing the number and reaction area of the iron reactant solid, and by increasing the concentration and reaction temperature of the hydrogen peroxide solution, so the volatilized hydrogen peroxide gas escaping from the reaction tank can be removed in the exhaust channel. Further, the exhaust channel in a non-linear form can increase the length of the exhaust channel in a limited space to improve the removal efficiency of hydrogen peroxide gas, before the cleaned or treated air is released to the ambient air.

[0061] In one embodiment, the Fenton air purification system of the present invention further comprises a chimney in gas communication with the exhaustchannel. The Fenton air purification system of the present invention can clean or treat the waste gas produced in the factory and then releases the cleaned or treated air through the chimney to outdoor air.

[0062] In one embodiment, the third light source is a light emitting diode. Preferably, the third light source has a wavelength the same as that of the first light source.

[0063] In one embodiment, the reaction tank is a single reaction tank or multiple reaction tanks. Preferably, each of the reaction tanks is provided with a first light source in a one-to-one manner, or each of the reaction tanks is provided with multiple first light sources in a one-to-many manner.

[0064] In one embodiment, the reaction tank accommodates multiple baskets, and the baskets are arranged horizontally, i.e., in a direction perpendicular to gravity.

[0065] In one embodiment, the reaction tank comprises multiple reaction tanks, and the reaction tanks are spaced apart at intervals in layers in the direction of gravity.

[0066] In one embodiment, the reaction tank accommodates multiple baskets arranged horizontally (i.e., in a direction perpendicular to gravity) and the reaction tank comprises multiple reaction tanks arranged and / or spaced apart in layers in the direction of gravity.

[0067] The present invention increases the number of the reaction tank and the first light source to increase the production of hydroxyl radicals in order toincrease the VOCs removal capabilities.

[0068] In one embodiment, the shell is provided with a door, and the reaction tank, the storage tank or a combination thereof is slidably connected to the shell, wherein when the door is open, the reaction tank, the storage tank or a combination thereof is slidable to pass through the door. The door improves the convenience to maintain the Fenton air purification system of the present invention, such as cleaning and replenishing hydrogen peroxide solution to the storage tank.

[0069] Preferably, the shell is provided with multiple slide rails, wherein the reaction tank, the storage tank or a combination thereof is provided with multiple pulleys, and the slide rails are disposed to directly contact the pulleys.

[0070] In one embodiment, the shell, the reaction tank, the storage tank or a combination thereof is made of stainless steel or a plastic.

[0071] In one embodiment, the first ventilation device is a fan. Preferably, the first ventilation device (the fan) is connected to the shell by a horizontal bar or a vertical bar.

[0072] The present invention uses the horizontal bar or the vertical bar to effectively avoid hindering airflow inside the shell.

[0073] In one embodiment, the Fenton air purification system further comprises a ventilating tube, wherein a top of the reaction tank has an opening, the opening is disposed toward the ventilating tube, and the ventilating tube extends toward the first ventilation device. Preferably, the ventilating tube isdisposed between the inlet hole of the shell and the reaction tank, or between the outlet hole of the shell and the reaction tank. More preferably, the top of the reaction tank is an opening.

[0074] In one embodiment, the ventilating tube has a tube wall with multiple holes. Preferably, the cross-sectional area of the ventilating tube gradually increases in the direction toward the first ventilation device, or the ventilating tube tapers toward the reaction tank. That is, the ventilating tube has different cross-sectional areas at both ends, and the cross-sectional area at the end adjacent to the reaction tank is smaller than the opposite end to improve ventilation efficiency.

[0075] In one embodiment, the ventilating tube is disposed to directly contact a top of the reaction tank.

[0076] In one embodiment, the Fenton air purification system comprises the hydrogen peroxide solution. Preferably, the hydrogen peroxide solution comprises water and hydrogen peroxide. More preferably, the hydrogen peroxide solution comprises water, hydrogen peroxide and phosphoric acid.

[0077] In one embodiment, the hydrogen peroxide solution has a pH value of 2 to 4. Preferably, the hydrogen peroxide solution has a pH value of 2.5 to 3.5.

[0078] In one embodiment, based on the total volume of the hydrogen peroxide solution, the hydrogen peroxide has a concentration of 20 w / v% to 80 w / v%. Preferably, the hydrogen peroxide has a concentration of 25 w / v% to 55 w / v%.In one embodiment, the hydrogen peroxide in the reaction tank has a concentration of 25 w / v% to 35 w / v%. Preferably, the hydrogen peroxide in the reaction tank has a concentration of 30 w / v%.

[0079] In one embodiment, the hydrogen peroxide solution in the storage tank has a higher concentration than that of the hydrogen peroxide solution in the reaction tank. Preferably, the hydrogen peroxide in the storage tank has a concentration of 45 w / v% to 55 w / v%. More preferably, the hydrogen peroxide in the storage tank has a concentration of 50 w / v%.

[0080] In one embodiment, the hydrogen peroxide solution further comprises phosphoric acid to maintain pH value. Preferably, based on the total volume of the hydrogen peroxide solution, the phosphoric acid has a concentration of 0.05 w / v% to 0.5 w / v%. More preferably, the phosphoric acid has a concentration of 0.08 w / v% to 0.15 w / v%. Further preferably, the phosphoric acid has a concentration of 0.1 w / v%.

[0081] In one embodiment, the present invention is suitable for automobile manufacturing industry, petrochemical industry, electronics industry (such as semiconductor industry and gravure printing), dry cleaning industry, a plastic processing industry (such as PU synthetic leather production), surface coating industry, office buildings, apartments, schools, medical facilities (including operating rooms and baby rooms), tunnels, mass rapid transit (MRT) stations and animal husbandry, etc.

[0082] To sum up, the Fenton air purification system of the present invention utilizes Fenton reaction to produce and release hydroxyl radicals into the air toremove harmful substances such as volatile organic compounds in the air through hydroxyl radical-mediated oxidation reactions. Further, the present invention does not require combustion, which avoids the high cost for longterm operation of the combustion furnace and improves safety, and is suitable for working environments in the factory or office, or the environments at home. Finally, the Fenton air purification system of the present invention has the advantages of power saving, low cost, easy expansion of production capacity, low noise, easy maintenance and no undesirable derivatives.

[0083] BRIEF DESCRIPTION OF THE DRAWINGS FIG.1 is a schematic diagram of the structure of the Fenton air purification system of Example 1-1 of the present invention.

[0084] FIG.2 is a stereo view of the appearance of the Fenton air purification system of Example 1 - 1 of the present invention.

[0085] FIG.3 is a top view of the Fenton air purification system of Example 1-1 of the present invention.

[0086] FIG.4 is a stereo view of the appearance of the Fenton air purification system of Example 1-2 of the present invention.

[0087] FIG.5 is a photo of the appearance of the iron reactant solid (the iron beads).

[0088] FIG.6 is a schematic diagram of the structure of the Fenton air purification system of Example 1-3 of the present invention.

[0089] FIG.7 is a schematic diagram of the structure of the Fenton airpurification system of Example 2 of the present invention.

[0090] FIG.8 is a stereo view of the appearance of the Fenton air purification system of Example 2 of the present invention.

[0091] FIG.9 is a schematic diagram of the cross-section in the vertical direction of the Fenton air purification system of Example 3-1 of the present invention.

[0092] FIG.10 is a schematic diagram of a cross-section in the horizontal direction of the Fenton air purification system of Example 3-1 of the present invention.

[0093] FIG.11 is a schematic diagram of the cross-section in the vertical direction of the Fenton air purification system of Example 3-2 of the present invention.

[0094] FIG.12 is a schematic diagram of a cross-section in the horizontal direction of the Fenton air purification system of Example 3-2 of the present invention.

[0095] FIG.13 is a schematic diagram of the cross-section in the vertical direction of the exhaust channel in the Fenton air purification system of Example 3-3 of the present invention.

[0096] FIG.14 shows the DMPO-OH electron spin resonance spectrum obtained at different time points in Test 1 of the present invention.

[0097] FIG.15 shows the DMPO-OH concentration change obtained at different time points in Test 1 of the present invention.FIG.16 shows the TEMPOL electron spin resonance spectrum obtained in Test 2 of the present invention.

[0098] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0099] The present invention is further explained through the following embodiments. A person having ordinary skill in the art can easily understand the advantages and efficacies achieved by the present invention. The present invention should not be limited to the contents of the embodiments. A person having ordinary skill in the art can make some improvement or modifications which are not departing from the spirit and scope of the present invention to practice or apply the content of the present invention.

[0100] Example 1-1: Fenton air purification system 1A

[0101] As shown in FIG.1, first, the Fenton air purification system of the present invention 1A comprises a shell 10, a reaction tank 11, a first light source 12, a storage tank 13 and a first ventilation device 14: wherein the shell 10 surrounds the reaction tank 11, the first light source 12, the storage tank 13 and the first ventilation device 14. The shell 10 has an inlet hole 101 and an outlet hole 102, the inlet hole 101 is in gas communication with the outlet hole 102, and the first ventilation device 14 is adjacent to the inlet hole 101. The reaction tank 11 accommodates an iron reactant solid 2, the first light source 12 illuminates the iron reactant solid 2, and the first light source 12 provides ultraviolet light C. The storage tank 13 is connected to the reaction tank 11, and the storage tank 13 accommodates a hydrogen peroxide solution for supplying to the reaction tank 11. The Fenton air purification system 1 A operates at roomtemperature.

[0102] Second, the first ventilation device 14 comprises a fan. The reaction tank 11 has a top 110, which is an opening, and the top 110 is further provided with a ventilating tube 111, wherein the ventilating tube 111 surrounds the opening of the reaction tank 11 and extends toward the first ventilation device 14. The cross-sectional area of the ventilating tube 111 increases toward the first ventilation device 14. The ventilating tube 111 has a tube wall comprising multiple holes 1110, there is an airflow in a space surrounded by the shell 10, and an airflow direction F is the same with the direction of gravity. Further, the airflow can pass through the holes 1110 of the ventilating tube 111 to facilitate dispersing hydroxyl radicals.

[0103] Third, the first light source 12 is a light emitting diode and provides ultraviolet light C with a wavelength of 254 nm. The shell 10 has an inner wall surface 103 and an outer wall surface 104 opposite to each other, the inner wall surface 103 faces the reaction tank 11, and the inner wall surface 103 is made of sandblasted stainless steel, which facilitates adding a titanium dioxide coating 1030. The outer tank wall surface 112 of the reaction tank 11 is provided with a titanium dioxide coating 1030, and the outer tank wall surface 112 of the reaction tank 11 is further provided with a second light source 15, which provides ultraviolet light C with a wavelength of 254 nm. The hydrogen peroxide escaping from the reaction tank 11 and passing through the holes 1110 of the ventilating tube 111 is removed by the photoreaction between the ultraviolet light C and the titanium dioxide coating 1030.As shown in FIG.2, the top of the shell 10 has a net or a mesh structure. The inlet holes 101 are at both the top and the side walls adjacent to the top of the shell 10. The outlet holes 102 surround the storage tank (not shown).

[0104] As shown in FIG.3, the first ventilation device 14 (a fan) is fixed to a horizontal bar 140, and the horizontal bar 140 is fixed diagonally and connected to the shell 10. That is, the first ventilation device 14 is fixed to the shell 10 through the horizontal bar 140.

[0105] Example 1-2: Fenton air purification system IB

[0106] FIG.4 shows that the shell 10 is provided with a door 105, when the door 105 is open, the reaction tank (not shown) and / or the storage tank (not shown) is slidable to pass through the door 105 to improve the convenience to maintain the Fenton air purification system IB of the present invention, such as cleaning and replenishing hydrogen peroxide solution to the storage tank.

[0107] As shown in FIG.5, the iron reactant solid is iron beads after rust thereon was removed, which are all in black color without the reddish brown color of the rust. Each of the iron beads after rust thereon was removed has a diameter of 2 cm and a weight of about 33 g.

[0108] Example 1-3: Fenton air purification system 1C

[0109] The Fenton air purification system 1C improves ventilation capacity and is suitable for large spaces such as factories. As shown in FIG.6, first, Fenton air purification system 1C further comprises a second ventilation device 16; wherein the reaction tank 11 is disposed between the first ventilation device14 and the second ventilation device 16, the first ventilation device 14 is adjacent to the inlet hole 101, and the second ventilation device 16 is adjacent to the outlet hole 102 to effectively guide airflow into and out of the Fenton air purification system 1C.

[0110] Second, the top 110 of the reaction tank 11 is provided with a ventilating hole 113 and a switch mechanism 120, and the switch mechanism 120 comprises a cover, and the cover is movable to open or close the ventilating hole 113. The Fenton air purification system 1C further comprises an air supply device 17 connected to the reaction tank 11, wherein the reaction tank 11 has a side wall protruding outward to form a buffer space 114, the air supply device 17 has a blowing hole connected to the top 110 of the reaction tank 11, and the blowing hole of the air supply device 17 is disposed toward the buffer space 114, so that the air with hydroxyl radicals can be pushed to pass through the ventilating hole 113 and leaves the reaction tank 11 so as to effectively improve the delivering efficiency of the hydroxyl radicals from the reaction tank 11 to the ambient air.

[0111] Third, the Fenton air purification system 1C further comprises a cooling device 18 connected to the reaction tank 11 so as to reduce the temperature of the hydrogen peroxide solution in the reaction tank 11 to stop the Fenton reaction.

[0112] Fourth, the iron reactant solids 2 are put in the reaction tank 11. The iron reactant solids 2 are iron beads with a diameter of 2 cm in a number of 330 in total and are arranged and dispersed in a single layer. The top surface of theiron reactant solid 2 is about 3 cm away from the bottom of the reaction tank 11 and below the liquid level of the hydrogen peroxide solution. The hydrogen peroxide solution has a liquid level with a height of 10 cm. Therefore, the height of the liquid level of the hydrogen peroxide solution and the average diameter of the iron reactant solids 2 have a ratio of 1:0.2. Further, the hydrogen peroxide solution is about 20 liters and comprises water, hydrogen peroxide and phosphoric acid. Based on the total volume of the hydrogen peroxide solution, the hydrogen peroxide has a concentration of 30 w / v%, and the phosphoric acid has a concentration of 0.1 w / v%. The Fenton air purification system 1C operates at room temperature.

[0113] Fifth, the first light source 12 is provided inside the reaction tank 11, and the first light source 12 is accommodated in a transparent case (not shown) to keep out hydroxyl radicals and the escaped hydrogen peroxide gases. The second light sources 15 are provided on the inner wall surface 103 of the shell 10. The titanium dioxide coatings 1030 are provided on the inner wall surface 103 of the shell 10 and the outer tank wall surface 112 of the reaction tank 11 to remove the hydrogen peroxide escaped from the reaction tank 11.

[0114] Example 2: Fenton air purification system ID

[0115] As shown in FIG.7, first, the Fenton air purification system ID comprises a shell 10, a reaction tank 11, a first light source 12, a storage tank 13 and a first ventilation device 14. The shell 10 surrounds the reaction tank 11, the first light source 12, the storage tank 13 and the first ventilation device 14. The shell 10 has an inlet hole 101 and an outlet hole 102, wherein the inlet hole101 is in gas communication with the outlet hole 102, and the first ventilation device 14 is adjacent to the outlet hole 102.

[0116] Second, the top 110 of the reaction tank 11 is an opening, and the top 110 is further provided with a ventilating tube 111, and the ventilating tube 111 surrounds the opening and extends toward the first ventilation device 14. The ventilating tube 111 has a tube wall comprising multiple holes 1110. The ventilating tube 111 comprises an upper half section and a lower half section adjacent to each other, the upper half section is away from the opening of the reaction tank 11, and the upper half section has more holes 1110 (4 holes 1110 in FIG.7) than those of the lower half section (2 holes in FIG.7).

[0117] Third, a first liquid level sensor 116 is connected to the reaction tank 11 for detecting a low liquid level in the reaction tank 11, wherein the low liquid level indicates a liquid level that requires replenishing hydrogen peroxide solution. A second liquid level sensor 117 is connected to the reaction tank 11 for detecting a high liquid level in the reaction tank 11, wherein the high liquid level indicates a liquid level that stops replenishing hydrogen peroxide solution. The low liquid level is lower than the high liquid level by 2 cm. The storage tank 13 is connected to the reaction tank 11 and accommodates a hydrogen peroxide solution for supplying to the reaction tank 11. Further, the first light source 12 is disposed inside the reaction tank 11, and is disposed above the high liquid level.

[0118] Fourth, a lifting device 118 is connected to a flat bottom mesh basket 119 and the reaction tank 11. The flat bottom mesh basket 119 is inside thereaction tank 11 and accommodates the iron reactant solid (not shown). The first light source 12 illuminates the iron reactant solid, and provides ultraviolet light C. The present invention uses the lifting device to shorten the distance between the iron reactant solid and the first light source 12, thereby increasing the reaction rate of Fenton reaction.

[0119] Fifth, in a space surrounded by the shell 10, an airflow direction F is opposite to the direction of gravity. The inlet holes 101 surround the storage tank 13. The outlet hole 102 is at the top of shell 10. An air filter cotton 19 is provided between the inlet holes 101 and the storage tank 13 to prevent particles or dust from entering the space surrounded by shell 10.

[0120] Sixth, the Fenton air purification system 1C operates at room temperature. The reaction tank 11 has a volume of 400 ml, the storage tank 13 has a volume of 2 liters, the iron reactant solid comprises 214 iron beads in total, and each iron bead is about 1 g with a diameter of about 0.6 cm. The volume of the reaction tank 11 of Example 2 is small and limits the reaction area and reaction rate of the Fenton reaction, so little hydrogen peroxide is escaped from the reaction tank 11. Therefore, there is no second light source and photocatalyst coating in the Fenton air purification system 1C.

[0121] Finally, as shown in FIG.8, the inlet holes 101 are adjacent to the bottom of the shell 10, and the dense arrangement of the inlet holes 101 increase the air intake.

[0122] Example 3-1: Fenton air purification system IE

[0123] As shown in FIG.9, first, the Fenton air purification system IE of thepresent invention comprises a shell 10, a reaction tank 11, a first light source 12, a storage tank (not shown), a first ventilation device 14 and a second ventilation device 16. The shell 10 surrounds the reaction tank 11, the first light source 12, the first ventilation device 14 and the second ventilation device 16. The shell 10 has an inlet hole 101 and an outlet hole 102. The reaction tank 11 accommodates an iron reactant solid 2, and the first light source 12 illuminates the iron reactant solid 2 and provides ultraviolet light C. The storage tank (not shown) is connected to the reaction tank 11 and accommodates a hydrogen peroxide solution for supplying to the reaction tank 11. The storage tank (not shown) is provided outside the shell 10 and connected to the reaction tank 11 by a pipe (not shown) passing through the shell 10. Further, an air supply device (not shown) connected to the reaction tank 11 can be provided to the Fenton air purification system IE.

[0124] Second, the reaction tank 11 comprises multiple reaction tanks 11, and the reaction tanks 11 are spaced apart at intervals in layers in the direction of gravity. That is, the bottom of each reaction tank 11 extends in a horizontal direction, and the bottoms of the reaction tanks 11 are spaced apart from each other in a vertical direction. Further, each of the reaction tanks 11 is provided with the first light source 12. The first light source 12 is a light emitting diode, and provides ultraviolet light C with a wavelength of 254 nm. The shell 10 has an inner wall surface 103 and an outer wall surface 104 opposite to each other. The inner wall surface 103 of the shell 10 faces the reaction tank 11, and the inner wall surface 103 is made of sandblasted stainless steel, and is furtherprovided with a titanium dioxide coating 1030. The first light source 12 also illuminates the titanium dioxide coating 1030. Further, a second light source (not shown) can be further provided to the inner wall surface 103 of the shell 10.

[0125] Third, the iron reactant solid 2 comprises iron beads, which are stacked in a flat bottom mesh basket 119 inside the reaction tank 11. The bottom of the flat bottom mesh basket 119 is spaced apart from the bottom of the reaction tank 11. Further, the flat bottom mesh basket 119 is hung on the wall of the reaction tank 11.

[0126] Fourth, in a space surrounded by the shell 10, the airflow direction F is perpendicular to the direction of gravity.

[0127] Fifth, the reaction tank 11 is further connected to a heater (not shown), and the heater is set to provide a temperature of 60°C to increase the production of hydroxyl radicals.

[0128] Sixth, multiple Fenton air purification systems IE can be connected in series to effectively increase the concentration of hydroxyl radicals, thereby significantly increasing the capacity to remove harmful substances such as volatile organic compounds.

[0129] Finally, FIG.10 provides a top view, wherein the reaction tank 11 is in the shape of a bed with a length of 180 cm, a width of 150 cm, and a depth of 120 cm. The reaction tank 11 in Example 3-1 has a volume larger than those of Example 1-1, Example 1-2, Example 1-3 and Example 2 to significantly increase the production of hydroxyl radicals. Further, two first light sources 12are provided above each reaction tank 11.

[0130] Example 3-2: Fenton air purification system IF

[0131] The difference between Example 3-1 and Example 3-2 is the number of the flat bottom mesh basket 119 as follows: As shown in FIGS.11 and 12, three reaction tanks 11 are arranged and / or spaced apart in layers in the direction of gravity. Each reaction tank 11 accommodates nine flat bottom mesh baskets 119 arranged horizontally in a direction perpendicular to gravity.

[0132] Example 3-3: Fenton air purification system

[0133] As shown in FIG.13, the differences between Example 3-1 and Example 3-3 are as follows: the Fenton air purification system of Example 3-3 further comprises an exhaust channel 19, the exhaust channel 19 is in gas communication with the second ventilation device (not shown), wherein the inner surface of the exhaust channel 19 is provided with a titanium dioxide coating 1030 and a third light source 20, and the third light source 20 provides ultraviolet light C and illuminates the titanium dioxide coating 1030. The exhaust channel 19 is curved to increase the length of the exhaust channel 19 in a limited space, thereby improving the removal efficiency of hydrogen peroxide gas.

[0134] Test 1: hydroxyl radicals detection

[0135] This test was carried out in an air-tight system. First, 286 iron beads in total (each of which was about I g with a diameter of about 0.6 cm) and 200 ml hydrogen peroxide solution (which comprised 50 w / v% hydrogen peroxide and0.1 w / v% phosphoric acid, and the rest were water) were added into a 500 ml round-bottom reaction flask and heated to 60°C.

[0136] A solution containing 10 mM of 5,5-Dimethyl-1-pyrroline N-oxide (DMPO) in 20 ml distilled water, called the DMPO solution, was added to a 200 ml round-bottom collection flask. DMPO is a known spin trap, which can react with short half-life hydroxyl radical (•OH) to form stable DMPO-OH adduct.

[0137] The 500 ml round-bottom reaction flask was connected to the 200 ml round-bottom collection flask via a Teflon tube. A small glass tube was inserted into the 200 ml round-bottom collection flask, with one end connected to the Teflon tube and the other end submerged in the DMPO solution. The entire airtight system (comprising the 500 ml round-bottom reaction flask connected to the 200 ml round-bottom collection flask via the Teflon tube and the small glass tube) was continuously purged with nitrogen gas at a flow rate of about 2 ml / sec.

[0138] Every 10 minutes, a sample (about 1 ml) was withdrawn from the 200 ml round-bottom collection flask using a syringe and the amount of DMPO-OH adduct in the sample was measured by electron spin resonance spectroscopy as below.

[0139] X-Band Continuous wave (CW) Electron Spin Resonance (ESR) measurements were performed at room temperature using a Bruker EMXmicro-6 / 1 / S / L spectrometer equipped with a Bruker E4119001 HS-W1 resonator and Bruker high sensitive aqua x 94 bore cell. Microwave power was10 dB. Magnetic field modulation amplitude was 10 G.

[0140] As illustrated in FIG.14, the sample taken at 0 min showed no discernible ESR signal, only a background signal of a flat and smooth curve. In comparison, the samples taken at 10 min and after revealed distinctive ESR spectra of DMPO-OH adduct consisting of a 1:2:2: 1 quartet with the hyperfine splitting constant of aN=15.0 G and g=2.0062 as shown in FIG.14.

[0141] In addition, a DMPO-OH adduct concentration change was calculated by Xepr software and shown in FIG.15. As shown in FIG.15, the intensities of the DMPO-OH spectra increased with time until reached the peak at 40 min and then dropped, as the 500 ml round-bottom reaction flask was not further supplemented with the hydrogen peroxide solution.

[0142] The results presented in FIG.14 showed clearly that hydroxyl radicals (•OH) generated from the Fenton reaction in the 500 ml round-bottom reaction flask were released into the gas phase and captured by DMPO spin trap in the 200 ml round-bottom collection flask as evidenced by the ESR experiment. In sum, the ESR spin trapping experiment demonstrated unequivocally that hydroxyl radicals generated from the Fenton reaction in the solution can indeed be released into the air.

[0143] Test 2: quantitative analysis of hydroxyl radicals

[0144] As a reference standard, 4-Hydroxy-TEMPO (TEMPOL) has the following advantages: (1) stable characteristics with low reactivity'; (2) the ESR spectrum thereof is well resolved; and (3) the hyperfine splitting constant thereof is known, so it is selected as a reference standard. The ESR spectrum ofTEMPOL was obtained following the same steps in Test 1 and was shown in FIG.16. Through the aqueous solution containing TEMPOL in a series of concentrations of 0.0005 M, 0.001 M, 0.0015 M, 0.002 M and 0.0025 M, a calibration curve of the TEMPOL concentration was obtained by Xepr software. According to said calibration curve of the TEMPOL, the ESR spectrum of DMPO-OH at 40 mins was estimated to have a concentration of 2.13×10-4M of DMPO-OH adduct in the 200 ml round-bottom collection flask. After further calculation, Test 1 was found to release hydroxyl radicals (*OH) to the gas phase from the 500 ml round-bottom reaction flask with a concentration of 2.3 017•OH / m’ / sec.

[0145] Finally, in comparison with the hyperfine pattern of the ESR spectrum of DMPO-OH disclosed in the journal of Ching-San Lai and Lawrence H. Piette (see, Hydroxyl radical production involved in lipid peroxidation of rat liver microsomes, Biochemical and Biophysical Research Communications, Volume 78, Issue 1, 9 September 1977, Pages 51-59), the hyperfine pattern of the ESR spectrum of DMPO-OH in FIG.14 appeared to be broader; however, as the hyperfine pattern of the standard TEMPOL in FIG.16 was broader as well, it was clear that such hyperfine pattern differences may result from the instrumental settings.

[0146] Test 3: formaldehyde reduction test of Example 1-3

[0147] The Fenton air purification system of Example 1-3 was placed in a closed room of approximately 16 square meters and 2.5 meters high in the factory owned by Benison Company in Taoyuan, Taiwan. Test 3 comprised acontrol group and an experimental group as follows: No power was supplied to the Fenton air purification system 1C in the control group. That is, the first light source, the second light source, the first ventilation device, the second ventilation device and the air supply device thereof did not turn on. The Fenton air purification system 1C in the experimental group was supplied with power to turn on the system.

[0148] Test method: The staff wearing a protective clothing and gas masks randomly sprayed 30 ml of formaldehyde with a sprayer in the closed room and left. A volatile organic compound (VOC) monitor (brand: Air Quality monitor, model: Ak3) was placed in the closed room. The detected formaldehyde concentration displayed by the VOC monitor was observed through a window of the closed room, wherein the data was recorded per 10 minutes. The results are shown in Table 1.

[0149] Table 1: the formaldehyde reduction results of the Fenton air purification system of Example 1-3 in the control group and the experimental group (Unit: mg / m3)

[0150] Control group Experimental group 10 min 0.192 0.195

[0151] 20 min 0.186 0.161

[0152] 30 min 0.181 0.129

[0153] 40 min 0.168 0.114

[0154] 50 min 0.158 0.104

[0155] 60 min 0.152 0.097

[0156]

[0157] Average 0.173 0.133

[0158]

[0159] According to Table 1, the formaldehyde concentration in the closed room in the experimental group was significantly reduced during the course of 60 minutes. The averaged formaldehyde concentration in the experimental group within 60 minutes was only 0.133 / 0.173*100%=77% of that in the control group. The results demonstrated that the Fenton air purification system in Example 1-3 can effectively reduce formaldehyde concentration in the closed room of a relatively large space.

[0160] Test 4: Total Volatile Organic Compound (TVOC) and formaldehyde reduction test of the Fenton air purification system of Example 2

[0161] Test 4 comprised a control group and an experimental group as follows: In the control group, only a test piece (a gypsum board, 12 cmx8 cm) sprayed evenly with spray paint (transparent red, Telox 127) was placed in a sealed box with a volume of 480 liters. In the experimental group, both a test piece (a gypsum board, 12 cmx8 cm) sprayed evenly with spray paint (transparent red, Telox 127) and the Fenton air purification system of Example 2 were placed in said sealed box. The concentration of TVOC and formaldehyde were measured by the VOC monitor (brand: Air Quality monitor, model: Ak3) inside the sealed box, wherein the data was recorded per 10 minutes. The results are shown in Table 2.

[0162] Table 2: the reduction results of TVOC and formaldehyde of the Fenton air purification system of Example 2 (Unit: mg / )

[0163] Control group Experimental group

[0164]

[0165] TVOC formaldehyde TVOC formaldehyde 10 min 2 0.256 0.596 0.107 20 min 2 0.279 0.536 0.096 30 min 2 0.286 0.455 0.081 40 min 2 0.282 0.381 0.068 50 min 2 0.273 0.311 0.056 60 min 9 0.26 0.262 0.047 Average 2 0.27 0.42 0.08

[0166]

[0167] As shown in Table 2 in the experimental group, the concentrations of both TVOC and formaldehyde were found to be reduced significantly. At 10 minutes, the TVOC concentration of the experimental group was only 0.596 / 2* 100%=29.8% of that in the control group, while the formaldehyde concentration of the experimental group was only 0.107 / 0.256* 100%=41.8% of that in the control group. Furthermore, within 60 minutes, the averaged concentration of TVOC in the experimental group was only 0.42 / 2* 100%=21% of that in the control group, while the averaged concentration of formaldehyde in the experimental group was only 0.08 / 0.27* 100%=29.6% of that in the control group. The results showed clearly that the Fenton air purification system in Example 2 was markedly effective in reducing TVOC and formaldehyde released from the spray paint coated on the surface of the gypsum board in the sealed box of a small space.

[0168] To sum up, the Fenton air purification system of the present invention utilizing Fenton reaction to produce hydroxyl radicals can effectively remove1 harmful substances such as volatile organic compounds in the air through hydroxyl radical- mediated oxidation reactions.

Claims

WHAT IS CLAIMED IS:

1. A Fenton air purification system, comprising: a shell, a reaction tank, a first light source, a storage tank and a first ventilation device; whereinthe shell surrounds the reaction tank, the first light source and the first ventilation device;the shell has an inlet hole and an outlet hole, the inlet hole is in gas communication with the outlet hole, and the first ventilation device is adjacent to the inlet hole or the outlet hole;the reaction tank accommodates an iron reactant solid;the first light source provides ultraviolet light C and illuminates the iron reactant solid; andthe storage tank is connected to the reaction tank and accommodates a hydrogen peroxide solution for supplying to the reaction tank.

2. The Fenton air purification system as claimed in Claim 1, wherein the iron reactant solid comprises iron beads or an iron block after rust thereon is removed;the first light source is a light emitting diode;the ultraviolet light C has a wavelength of 200 nm to 280 nm;the shell, the reaction tank, the storage tank or a combination thereof is made of stainless steel or a plastic; andthe first ventilation device is a fan.

3. The Fenton air purification system as claimed in Claim 1, wherein the shell has an inner wall surface and an outer wall surface opposite to each other, and the inner wall surface faces the reaction tank;the reaction tank has an inner tank wall surface and an outer tank wall surface opposite to each other:the inner wall surface of the shell, the outer tank wall surface of the reaction tank or a combination thereof is provided with a photocatalyst coating;the photocatalyst coating is made of a material selected from a group consisting of titanium dioxide, zinc oxide, tungsten trioxide, bismuth vanadium oxide, graphitic carbon nitride and cadmium sulfide;the inner wall surface of the shell and the outer tank wall surface of the reaction tank or a combination thereof is provided with a second light source; andthe second light source is a light emitting diode and provides ultraviolet light C with a wavelength of 200 nm to 280 nm.

4. The Fenton air purification system as claimed in Claim 1, further comprising a second ventilation device; whereinthe reaction tank is located between the first ventilation device and the second ventilation device;the first ventilation device is adjacent to the inlet hole; andthe second ventilation device is adjacent to the outlet hole.

5. The Fenton air purification system as claimed in Claim 1, further comprising an air supply device connected to the reaction tank; wherein the reaction tank has a side wall protruding outward to form a buffer space;the air supply device has a blowing hole connected to a top of the reaction tank; andthe blowing hole is disposed toward the buffer space.

6. The Fenton air purification system as claimed in Claim 1, further comprising a cooling device, a heating device or a combination thereof, wherein the cooling device, the heating device or a combination thereof is connected to the reaction tank.

7. The Fenton air purification system as claimed in Claim 1, wherein a top of the reaction tank is provided with a ventilating hole and a switch mechanism, and the switch mechanism is movable to open or close the ventilating hole.

8. The Fenton air purification system as claimed in Claim 4, further comprising an exhaust channel in gas communication with the second ventilation device; whereinthe exhaust channel is provided with a photocatalyst coating and a third light source;the third light source provides ultraviolet light C and illuminates the photocatalyst coating; andthe exhaust channel is curved.

9. The Fenton air purification system as claimed in Claim 1, wherein the shell is provided with a door;the reaction tank, the storage tank or a combination thereof is slidably connected to the shell; andwhen the door is open, the reaction tank, the storage tank or a combination thereof is slidable to pass through the door.

10. The Fenton air purification system as claimed in Claim 1, wherein thehydrogen peroxide solution in the storage tank has a higher concentration than that of the hydrogen peroxide solution in the reaction tank.

11. The Fenton air purification system as claimed in Claim 1, wherein the first light source is accommodated in a transparent case.

12. The Fenton air purification system as claimed in Claim 1, wherein a first liquid level sensor is connected to the reaction tank for detecting a low liquid level in the reaction tank, and a second liquid level sensor is connected to the reaction tank for detecting a high liquid level in the reaction tank.

13. The Fenton air purification system as claimed in Claim 1, wherein the iron reactant solid is disposed to directly contact a bottom of the reaction tank, or the iron reactant solid is disposed at a position spaced from the bottom of the reaction tank.

14. The Fenton air purification system as claimed in Claim 1, wherein the reaction tank accommodates multiple baskets, and the baskets are arranged horizontally or in a direction perpendicular to gravity.

15. The Fenton air purification system as claimed in Claim 1, further comprising a ventilating tube, wherein a top of the reaction tank has an opening, the opening is disposed toward the ventilating tube, and the ventilating tube extends toward the first ventilation device.

16. The Fenton air purification system as claimed in Claim 15, wherein the ventilating tube tapers toward the reaction tank.

17. The Fenton air purification system as claimed in Claim 15, wherein the ventilating tube has a tube wall with multiple holes.

18. The Fenton air purification system as claimed in Claim 15, wherein1 the ventilating tube is disposed to directly contact the top of the reaction tank.

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