KR20210073422A - Method of preparing nano particle precusor tablet for photocatalyst and photocatalyst tablet material thereof - Google Patents

Abstract

The present invention relates to a method of preparing a photocatalytic nano solution precursor tablet and a composition thereof, in which nanomaterials of photocatalysts are prepared as precursor tablets, thereby making it easy to be store and transport. In case of use, water is added to quickly convert into a photocatalyst nano solution to act as a photocatalyst even in an environment without light irradiation. The method comprises: a first process of preparing a photocatalyst material from which impurities are removed and the particle diameter has a micrometer size; a second process of preparing a micrometer-sized photocatalyst material prepared in the first process by pulverizing the photocatalyst material having a particle diameter to a nanometer size in a room temperature environment; a third process of preparing a photocatalyst mixed powder material by mixing a binder and a desiccant with the powder of the photocatalyst material prepared in the nanometer size in the second process; and a fourth process of molding the photocatalyst mixed powder material prepared in the third process into a tablet by putting it into a tablet-shaped mold. Since the potential generated by the oxidation reduction reaction of chlorine dioxide is used as energy, the photocatalyst is operated even in places where there is no light energy. The photocatalyst can be quickly used anywhere, anytime, and prepared in the form of a precursor tablet, so it is light in weight, small in skin, and easy to store and move, thus providing an effect of increasing the utilization and preference of photocatalyst.

Description

Method of preparing nano-solution precursor tablet of photocatalysis and composition thereof {Method of preparing nano particle precusor tablet for photocatalyst and photocatalyst tablet material thereof}

The present invention relates to a method for preparing a nanosolution precursor tablet of photocatalysis and a composition thereof, and more particularly, to a nanomaterial made of a photocatalyst as a precursor tablet, which is very simple and easy to store and move. It relates to a photocatalytic nanosolution precursor tablet manufacturing method and composition thereof, which is rapidly converted into a photocatalytic nanosolution to act as a photocatalyst even in an environment without light irradiation.

Photocatalyst is a combination of photochemistry and catalyst, and refers to a catalyst that exhibits activity by light energy. In general, a catalyst serves to speed up or slow down the rate of a chemical reaction without changing the catalyst itself. In the process of a chemical reaction, heat or other energy sources are used. In the case of a photocatalyst, it is the energy used in the chemical reaction. use light When light energy from sunlight or artificial light is irradiated to the catalyst, the catalyst that absorbs the light energy is activated and plays a role in oxidizing or reducing organic matter.

In order for a photocatalyst to act as a photocatalyst by redox, it is absolutely necessary to absorb light energy, and the wavelength of sunlight (light) that titanium oxide or titanium dioxide (TiO2), which is a photocatalyst according to an example, can absorb is about 380. Ultraviolet radiation below nm. The photocatalytic reaction of titanium oxide occurs only when sunlight or ultraviolet rays or light is irradiated, and the reaction takes place as much as the amount of ultraviolet rays.

In the following description, sunlight, ultraviolet light, and light have the same meaning and are selectively used according to the context, and titanium oxide and titanium dioxide (TiO 2 ) have the same meaning and are selectively used appropriately in the context.

When a potential of 3.2 electron volts (eV) is applied, titanium dioxide is excited and functions as a photocatalyst, and when it is irradiated with ultraviolet rays contained in the sun, it is excited to generate a photocatalytic function by oxidation and reduction.

That is, the oxidation-reduction potential (ORP) of titanium dioxide is 3.2 eV, and this value is one of the important variables for measuring the oxidation and reduction of water.

Titanium dioxide is widely used as a white pigment, high-frequency capacitor material, optical material such as low-reflection coating, sensor and protective material, etc. In particular, it is being actively studied as a new environment-improving photocatalyst material with infinite application potential. have.

Titanium mineral is the ninth most common mineral on Earth, accounting for 0.6% of the lei and about 1% of the surface.

As a prior art of a method for manufacturing such a photocatalyst material, there is a 'photocatalyst, its manufacturing method, and photocatalytic device' according to Korean Patent Registration No. 10-1450389 (October 06, 2014).

The method for manufacturing a photocatalyst according to the prior art forms a first metal oxide film which is porous and made of at least one of titanium oxide, tungsten oxide, zinc oxide, and niobium oxide.

The first metal oxide film is made of any one or more of tungsten, chromium, vanadium, molybdenum, copper, iron, cobalt, manganese, nickel, platinum, gold, cerium, cadmium, zinc, magnesium, calcium, stronitium, barium, and radium. After being immersed in the precursor solution of the second metal, the precursor solution of the second metal is permeated into the pores inside the porous first metal oxide film.

A photocatalyst is prepared because the second metal is reduced by light irradiating the precursor solution of the second metal to the porous first metal oxide film containing the inner pores to form particles of the second metal in the inner pores of the porous first metal oxide film. do.

Although the method for manufacturing a photocatalyst according to the prior art has the advantage of producing a photocatalyst, it is nano-sized particles, and these nano-sized particles have a problem in that storage, movement and utilization are relatively difficult.

In addition, the photocatalyst according to the prior art has a problem of causing a redox reaction by operating as a photocatalyst only in an environment irradiated with sunlight.

Therefore, there is a need to develop a technology that allows the photocatalyst material to be easily stored and moved, to be used immediately at the desired time, and to operate as a photocatalyst even in an environment without sunlight.

Republic of Korea Patent Registration No. 10-1741644 (2017.05.24.) ‘A device for generating chlorine dioxide that can be used for a long time and continuously using a solid block’ Republic of Korea Patent Registration No. 10-1574473 (November 27, 2015) ‘Chlorine dioxide generator using sodium chlorite block’ Republic of Korea Patent Registration No. 10-1450389 (2014. 10. 06.) ‘Photocatalyst, its manufacturing method and photocatalyst device’ Republic of Korea Patent Registration No. 10-0757618 (2007.09.04.) ‘Agglomerates for producing highly converted chlorine dioxide solution’ Korean Patent Application No. 10-2007-0077498 (2007.08.01.) ‘Solid composition for producing chlorine dioxide solution with excellent long-term stability’

The present invention, which was devised to solve the problems and necessity of the prior art, operates as a photocatalyst by using the potential caused by the oxidation reduction reaction of chlorine dioxide as energy even in the absence of light energy in a photocatalyst made of nanoparticle-sized titanium oxide and to provide a method and composition for preparing a photocatalyst nanosolution precursor tablet that can be quickly used as a photocatalyst anytime, anywhere by mixing purified water when necessary.

In addition, the present invention provides a method for manufacturing a photocatalyst nanosolution precursor tablet that increases the utilization of the photocatalyst by manufacturing the photocatalyst nanomaterial in the form of a dried precursor tablet, so that the weight and volume of the photocatalyst is light and small, and storage and movement are easy. .

In order to achieve the above object, the method for manufacturing a nano-solution precursor tablet of the present invention devised for achieving the above object includes a first process of preparing a photocatalyst material in which impurities are removed and the particle diameter is micrometer size; a second process of manufacturing the micrometer-sized photocatalyst material prepared in the first process by pulverizing the photocatalyst material having a particle diameter of nanometers in a room temperature environment; a third process of preparing a photocatalyst mixed powder material by mixing an inorganic binder and a moisture absorbent with the powder of the photocatalyst material prepared in the nanometer size in the second process; a fourth process of injecting the photocatalyst mixed powder material prepared in the third process into a tablet-shaped mold and molding it into a tablet; may include.

a fifth process of drying the tablet molded in the fourth process in an environment of 30 to 70 degrees Celsius and a humidity of 10% or less for 2 to 3 hours; may further include.

a sixth process of packaging the tablet dried in the fifth process in a vacuum state; More may be included.

In the third process, sodium chlorite and citric acid may be further mixed.

The micrometer-sized photocatalyst prepared in the first process may have an average diameter in the range of 400 to 600 micrometers.

The photocatalyst prepared in the second process may have a size in the range of 10 to 30 nanometers in average diameter.

The photocatalyst may be prepared in an environment in the range of 100 to 250 gravitational acceleration.

The binder may be made of an environmentally friendly and harmless silica-based inorganic binder or starch.

In the fourth process, the photocatalyst mixed powder material is put into a mold that can be molded into a tablet shape, and a press of 0.1 to 1 ton is used, and pressure for 0.1 to 2 seconds can be applied.

A seventh process of removing the packaging of the tablet packaged in the sixth process, injecting the extracted tablet into purified water, and spraying the resulting nano solution in the air or around a pollutant or polluted environment; More may be included.

The nano-solution precursor tablet of the present invention devised to achieve the above object may be prepared according to any one of claims 1 to 4.

The photocatalytic nano solution precursor tablet contains 0.1 to 0.23 Wt% of a binder based on the weight of purified water to be mixed; 5 to 30 Wt% of a desiccant; 1 to 5 Wt% of titanium oxide photocatalyst; It can be prepared by mixing with

The photocatalyst powder may be made by further mixing sodium chlorite and citric acid.

It may consist of adding 5 to 40 Wt% of ethanol based on the purified water at the time of injecting the nano-solution precursor tablet of the photocatalytic action into purified water and spraying.

The desiccant may be any one selected from bentonite, zeolite, calcium chloride, and silica gel made of natural minerals, or a mixture of any one or more.

The desiccant is added to the mixer together with the nanoparticle-sized photocatalyst in a separate separate process, and the mixer is mixed in the range of 100 to 250 gravitational death speed for 5 to 10 minutes, and the photocatalyst is introduced into the inner cavity of the absorbent. can be manufactured with

The binder may be made of any one selected from natural and harmless vegetable starch, natural alginic acid, and PVA, or any one or more selected from the group consisting of natural and harmless to the human body.

The sodium chlorite is added together with a binder of nanoparticle size in a separately prepared mixer, and the mixer is mixed in a range of 5 to 60 seconds in a range of 100 to 250 gravitational acceleration, and the binder is coded on the outer surface. .

The citric acid is added together with a nanoparticle-sized binder in a separately prepared mixer, and the mixer is mixed in a range of 100 to 250 gravitational acceleration in a range of 5 to 60 seconds to prepare the binder coated on the outer surface.

The sodium chlorite and citric acid may be mixed in a 3:1 molar ratio and mixed with the photocatalyst powder to be 0.1 to 0.25 Wt% based on purified water in the mixed state in the molar ratio.

The present invention, having the above configuration, processes titanium oxide, a photocatalyst material, into nano-particle sizes and uses the potential caused by the oxidation reduction reaction of chlorine dioxide as energy, so that the photocatalyst operates even in places where there is no light energy, so that a photocatalyst is needed anytime and anywhere. It has the advantage of improved convenience in use, which can be used quickly in a place.

In addition, since the photocatalyst nanomaterial is manufactured in the form of a dried precursor tablet, it is light in weight, has a small skin, and is easy to store and move, thereby increasing the utilization and preference of the photocatalyst.

1 is an explanatory diagram of various diseases that may occur due to the absorption of fine dust into the human body, for explaining the present invention;
2 is an explanatory diagram of the state in which the photocatalyst affects antibacterial and deodorization for explaining the present invention;
3 is an explanatory diagram of the state affecting the antifouling and water purification of the photocatalyst for explaining the present invention;
4 is a conceptual explanatory diagram for decomposing Knox and Sachs of primary fine addresses generated in thermal power plants and automobiles with a photocatalyst for explaining the present invention;
5 is a flowchart illustrating a method for manufacturing a nano-solution precursor tablet of photocatalysis according to an embodiment of the present invention;
6 is an SEM photograph of a titanium oxide photocatalyst device manufactured in a nanoparticle size according to an embodiment of the present invention;
And
7 is a photograph taken by SEM after applying the nano-solution photocatalyst prepared according to an embodiment of the present invention to the comedon.

Since the present invention can apply various transformations and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to a specific embodiment, it should be understood to include all transformations, equivalents and substitutes included in the spirit and scope of the present invention. In describing the present invention, if it is determined that a detailed description of a related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

In the following description, titanium oxide or titanium dioxide (TiO 2 ) has the same meaning and is selectively used as appropriate for the context, and the mixer, mixer, and distributor are used as the same meaning and selectively used as appropriate for the context.

A tablet is in the form of a pill, and it can have a spherical shape, an oval sphere shape, a quadrangular hexahedron, a rectangular hexahedron, a geometric shape, etc.

Electron volt or electron volt (eV: electron volt) represents the unit of kinetic energy. It is the kinetic energy obtained whenever an electron (e, electron) crosses between two points with a potential difference of 1 volt (V) in vacuum. It is often used to express the mass of elementary particles by converting them into energy, and 1 electron volt corresponds to 1.602 * 10 to the minus 19th power of joule d, and the symbol is eV.

A precursor (precursor) refers to a compound that participates in a chemical reaction to produce a substance or another compound in the previous step to form a substance in a reaction system such as biosynthesis, biochemistry, chemistry, etc., also called a precursor or precursor. Hereinafter, the precursor will be described as a material (material) by a previous step capable of producing the material of the following order.

It is known that the photocatalyst material (raw material) includes titanium oxide, tungsten oxide, zinc oxide, niobium oxide, and the like. Hereinafter, titanium oxide will be mainly described for ease of explanation and understanding.

The study on the photoactivity of titanium dioxide, a semiconductor material, has its beginnings in the Honda-Fujishima effect announced by Professor Fujishima in 1972. When a battery composed of a titanium dioxide electrode and a platinum electrode is irradiated with light, water decomposition occurs at about -0.5 V, oxygen is generated on the surface of the titanium dioxide electrode, and hydrogen is generated around the platinum electrode. This is a unique phenomenon that occurs at a potential far lower than +1.23 V, which is the normal oxidative decomposition potential of water. Professor Fujishima transferred this phenomenon to the conduction band of the valance band of titanium dioxide by ultraviolet light. It has been explained that the oxidation of water is caused by the holes generated at this time to generate hydrogen.

The band energy inherent in the photocatalyst material of the semiconductor nature-In the semiconductor material, it is a linear combination of atomic orbitals called the conduction band (E cb) without electrons and the shared band (E vb) filled with electrons. There are molecular orbitals. Accordingly, there is a forbidden space between these two bands that electrons cannot occupy. This is called band energy (Eg), and its magnitude corresponds to E cb -E vb . The photochemical system in which the electron (e-) and hole (h+) pair generated after receiving light energy and the electron (e-) is excited (excitation) can be beneficially used to deliver light that can overcome the limitations of the existing reactor design make it

The conversion of light energy into chemical energy or electrical energy through the process of photochemical reaction means that the generated electrons/holes are adsorbed to the photocatalyst, reduce/oxidize the material in the diffusion layer, or generate an electric current by the configured electrode circuit. It is possible by creating If this is used, it can be used for environmental purification by decomposing surrounding organic substances, as well as water decomposition hydrogen production, solar cells, etc.

In order for the photocatalyst to operate as a photocatalyst by oxidation and reduction, light is used as energy for excitation of electrons (e-), but electrons (e-) are excited without using light. It is one of the technical ideas of the present invention to act as a photocatalyst.

That is, in the case of titanium dioxide, in order to operate as a photocatalyst, a potential of 3.2 eV must be applied by irradiation of light energy to operate as a photocatalyst by oxidation and reduction, but in the present invention, electrons (e-) are excited without irradiation of light. (Excitation) One of the technical ideas is to quickly generate a photocatalytic function even in a dark place as it supplies the necessary energy.

Gravitational acceleration (G) is the amount of change in velocity per time caused by gravity acting on an object. Gravity is expressed as the product of acceleration and mass. The gravitational acceleration varies slightly depending on the location, and the standard value of G based on gravity at the average sea level at 45° north latitude is set as g=9.80665m/s**2.

On the other hand, fine dust (fine dust, particle dust matter) is less than 10 micrometers (um), which is about 1/10 the size of a hair with a diameter of 50 - 70 micrometers (um), and penetrates into cells or breathes. In some cases, children and the elderly as well as healthy people may face serious diseases with reduced immunity. On the other hand, ultrafine dust refers to dust having a particle size of 2.5 micrometers (um) or less.

Recently, due to the rapid industrialization and acceleration of desertification in neighboring countries and some regions, a large amount of dust and fine dust are introduced into the atmosphere, and when the air containing such dust is directly inhaled, there are research cases that cause respiratory diseases. It has been reported a lot. In addition, fine dust may include various harmful bacteria, germs, molds, and the like.

Therefore, the need for the development of an eco-friendly technology to purify the air in the surrounding environment including fine dust is very high, and it is one of the tasks to be solved very urgently in reality.

1 is an explanatory diagram of various diseases that may occur due to the absorption of fine dust into the human body for explaining the present invention.

Referring to the accompanying drawings, fine dust with a diameter of 10 micrometers or less penetrates the eye and causes allergic conjunctivitis, keratitis, and the like. And fine dust with a size of 2 to 5 micrometers penetrates into the bronchial tubes, fine dust with a size of 1 to 2 micrometers is deposited in the lungs, and fine dust of a size of 0.1 to 1 micrometer is deposited in the alveoli. Fine dust that penetrates into the bronchial tubes causes bronchitis, emphysema, and asthma, and fine dust that settles in the lungs or alveoli causes damage to the alveoli.

2 is a diagram illustrating the state in which the photocatalyst affects antibacterial and deodorizing for explaining the present invention.

Referring to the accompanying drawings, the photocatalyst has a strong oxidizing action on single-celled organisms such as bacteria, fungi, and viruses, so it has a sterilizing power that destroys the cell membrane, and it has a sterilizing power 1.5 times stronger than that of chlorine or ozone.

OH radical by photocatalyst activation sterilizes various spoilage bacteria by strong oxidative action and has relatively excellent purification ability to decompose and sterilize substances causing bad odor to keep the surrounding environment clean.

3 is a diagram for explaining the present invention, and is an explanatory diagram of the state affecting the antifouling and water purification of the photocatalyst.

When described with reference to the accompanying drawings, since the photocatalyst decomposes and removes organic matter from the surface, it is possible to reduce social costs by using the photocatalyst with an antifouling function that naturally removes dirty dust.

And when the photocatalyst is included in the filter for water purification, viruses and organic matter in water can be decomposed and removed.

4 is a conceptual explanatory diagram of decomposing Knox and Sachs of primary fine addresses generated in thermal power plants and automobiles with a photocatalyst for explaining the present invention.

When described with reference to all the accompanying drawings, the primary fine dust generated in the state of being contained in the smoke emitted from the chimney of a thermal power plant using coal and exhaust gas from automobiles includes nitrogen compounds (NOx, rust) and sulfuric acid. Cargo (SOx, Sachs) is included, and these primary fine dusts meet with water vapor in the atmosphere to generate secondary fine dust.

Since these primary or secondary fine dust are decomposed by a photocatalyst by titanium oxide, the surrounding air environment is environmentally purged.

5 is a flowchart illustrating a method for manufacturing a nano-solution precursor tablet of photocatalysis according to an embodiment of the present invention.

When described in detail with reference to all the accompanying drawings, it is checked whether a command signal for starting the manufacture of a photocatalytic tablet is input by the corresponding control device configured in the photocatalytic tablet manufacturing system (S110).

The above control system monitors necessary for the production of the photocatalytic tablet, outputs a command signal for the corresponding control, and outputs a control device composed of a computer, a generally known nanoparticle photocatalyst manufacturing system, a mixing device, a tablet mold device, and a drying device , a packaging device, and the like, and each configuration may be made of one or more.

If it is determined that the photocatalytic tablet is manufactured in the above confirmation (S110), the impurities are removed and the average diameter of the particles is controlled and monitored to prepare a photocatalyst material having any one value selected from the range of 400 to 600 micrometers (S120) . It is relatively very preferable to prepare the photocatalyst material with a size of 500 micrometers in terms of manufacturing time, manufacturing cost, and operating efficiency.

The prepared micrometer-sized photocatalyst material is put into the nanoparticle photocatalyst manufacturing system, and the nanoparticle photocatalyst manufacturing system is driven with 100 to 250 gravitational acceleration to control and monitor the nanoparticle photocatalyst to be manufactured (S130). The diameter size of the nanoparticles is described as being included in the average size in the range of 10 to 30 nanometers.

Control and monitor so that an eco-friendly and silica-based inorganic binder is mixed with the photocatalyst powder manufactured in the nanoparticle size (S140), and a photocatalyst mixed powder material is manufactured by further mixing a desiccant, sodium chlorite and citric acid (S150).

In the following description, citric acid is anhydrous citric acid extracted from lemon, and is environmentally friendly and harmless to the human body.

6 is an SEM photograph of a titanium oxide photocatalyst device manufactured in a nanoparticle size according to an embodiment of the present invention.

Referring to FIG. 6 attached, it is a scanning electron microscopy (SEM) photograph of a titanium oxide photocatalyst device prepared in a nanoparticle size, and it is confirmed that the size of the titanium oxide photocatalyst nanoparticles is in the range of 10 to 30 nanometers on average.

The binder is harmless to the human body, edible, and eco-friendly silica-based inorganic binder or vegetable starch is included. As the starch, corn starch (cyclodextrin), sodium alginate, or polyvinyl alcohol (PVA) may be used. The absorbent may be any one of natural mineral bentonite, zeolite, calcium chloride, and silica gel, but it is relatively very preferable to use natural mineral bentonite. Citric acid anhydrous citric acid is used.

Sodium alginate is solidified into a metal salt when a divalent or higher metal ion such as calcium chloride, barium chloride, aluminum sulfate, zinc sulfate, copper sulfate, silver nitrate, iron(III) chloride, or lead acetate is added to an aqueous solution.

The prepared photocatalyst mixed powder material is put into a tablet mold, and pressure is applied to control and monitor it to be molded into a tablet (pill) (S160). The mold for forming into a tablet uses a press device of 0.1 to 1 ton and controls and monitors the pressure by the press for 0.1 to 2 seconds.

The tablet shape in which the photocatalyst is molded is dried for 2 to 3 hours in an environment of 30 to 70 degrees Celsius, a wind speed of 20 to 30 m/s, and a humidity of 10% or less (S170), so that each dried tablet is packaged in a vacuum state. Control and monitor (S180).

On the other hand, when it is determined that a signal requesting that the nano solution be prepared using the packaged tablet is input (S190), the tablet removed from the packaging is put into purified water (purified water) not to be contaminated, and the contaminated surrounding environment, air Control and monitor to spray heavy, pollutants, etc. (S200). At this time, if necessary, ethanol based on purified water is mixed in the range of 5 to 40 Wt% by weight.

Ethanol is known to be harmless to the human body, and it allows the purified water or spray solution to dry quickly so that the photocatalyst continues to work.

Nanoparticle photocatalyst in which oxidation-reduction occurs at a fast reaction rate and photocatalysis does not proceed when the nanoparticle photocatalyst solution is sprayed because ethanol is mixed at any one value selected from 5 to 40 Wt% based on the weight of purified water Since the evaporation point of purified water is lowered by ethanol, the nano-photocatalyst mixture solution dries or evaporates faster, and the photocatalytic action continuously reacts while slowly absorbing moisture by the desiccant, resulting in a long-term and continuous photocatalytic effect. There are advantages.

That is, when the mixing capacity of ethanol in purified water is large, such as 40 Wt%, the immediate effect is large, and when the capacity of ethanol mixed in purified water is small, such as 5 Wt%, the lasting effect is large.

On the other hand, the immediate effect and the lasting effect can be further activated by the binder. When starch, alginic acid, PVA, etc., which have a fast decomposition power by a photocatalyst, are used as binders, the immediate effect is increased, and when a silica-based inorganic binder with a low decomposition power by a photocatalyst is used, the lasting effect is increased. It is explained that the binder is harmless to the human body and is extracted and refined from natural plant materials.

The concept of controlling the reaction time such as an immediate effect or a lasting effect by the binder will be described again in detail below.

Sodium chlorite is coated with a binder by a separate process (process). That is, as a binder, a natural vegetable starch or silica-based inorganic binder and sodium chlorite are added to a separate mixer, and the mixer is mixed in a range of 5 to 60 seconds with a gravitational acceleration range of 100 to 250 gravitational acceleration, and dispersed in the conceptual state as follows. Prepare the first sanctions.

Meanwhile, by a separate process (process), natural citric acid or citric anhydride, which is harmless to the human body, is coated with a binder. That is, as a binder, natural vegetable anhydrous citric acid, which is harmless to the human body, and natural vegetable starch or silica-based inorganic binder and citric acid, which are equally harmless to the human body, are added to a separately prepared mixer, and the mixer is mixed with a gravity acceleration of 100 to 250 in a range of 5 to 60 gravity acceleration. Prepare the second material dispersed in the conceptual state as shown below by mixing in the second range.

Meanwhile, the photocatalyst is mixed with the desiccant by another separate process. The desiccant is used in a state in which any one or any one or more selected from bentonite, zeolite, calcium chloride, and silica gel made of natural minerals is mixed, and a plurality of empty pores are naturally formed in these minerals. This is a process of injecting a photocatalyst with a nano-particle size into the inner pores of the desiccant.

That is, a photocatalyst of nanoparticle size is added to a separately prepared mixer, a separately prepared desiccant is added together, and the mixer is mixed in the range of 100 to 250 gravitational acceleration for 5 to 10 minutes and dispersed (mixed) in the conceptual state as follows. , mixed) to prepare the third preparation.

The first to third agents prepared in this way are selected and mixed as a material of the photocatalyst powder.

When the tablet is put in purified water, chlorine dioxide (ClO2) is generated by the reaction of sodium chlorite (NaClO2) with citric acid or citric acid (C6H8O7) while absorbing moisture by a desiccant as shown in the following formula.

[ 3NaClO2 + C6H8O7 -> 3ClO2 + C6H8O7Na3 ]

That is, since the stoichiometric reaction molar ratio is 3:1, theoretically, when sodium chlorite and citric acid react in a 3:1 ratio, a safe maximum amount of chlorine dioxide can be obtained. 3ClO2 + C6H8O7Na3 generated and secured in this way is mixed at any one value in the range of 0.1 to 0.25 Wt% based on purified water.

The tablet contains 0.1 to 0.23 Wt% of a silica-based inorganic binder, 1 to 5 Wt% of a titanium oxide photocatalyst, based on the weight of purified water to be mixed; It is calculated in advance so as to be prepared in a mixed state. That is, the purified water should have a capacity to dilute the generated chlorine dioxide 400 to 1,000 times.

On the other hand, in the case of spraying the contaminated area using a tablet, if 5 to 30 Wt% of ethanol based on the weight of the purified water is further added to the purified water, the purified water is evaporated very effectively, so that the photocatalyst is applied well.

The oxidation potential by the reaction of chlorine dioxide is explained. The potential due to the key reaction according to the oxidation reduction of chlorine dioxide is as follows.

ClO2 + e- = ClO2- E° = 0.954V

The potential due to the half reaction of chlorine dioxide is as follows.

+ 2H2O + 4e

= Cl + 4OH

E° = 0.76V ClO2

+ 2H2O + 4e

= Cl + 4OH

E° = 0.76V

+ H2O + 2e

= ClO2

+ 2OH

E°= 0.33V ClO2

+ H2O + 2e

= ClO2

+ 2OH

E°= 0.33V

+ 2H⁺ + e

= ClO2

+ H2O E°= 1.152V ClO3

+ 2H ⁺ + e

= ClO2

+ H2O E°= 1.152V

The total potential value, which is the sum of the potential values by the key reaction and the half reaction, is 0.954 + 0.76 + 0.33 + 1.152 = 3.196 eV, so the value is almost similar to 3.2 eV for the titanium oxide photocatalyst to be excited. Calculated. Such potential values are publicly known in the art or academia.

Such a negligible difference in potential values can be regarded as a slight error of a negligible magnitude in the numerical value of either potential, and the excited result is the same in both, so the error range It will be described as being included in

Therefore, for photocatalytic operation by oxidation-reduction of titanium oxide, even without energy supply by sunlight or ultraviolet irradiation, it occurs as a key reaction and half-reaction of chlorine dioxide produced by mixing sodium chlorite and citric acid (citric acid, C6H8o7) There is an advantage in that the photocatalytic operation by oxidation-reduction can be performed by the electric potential.

7 is a photograph taken by SEM after applying the nano-solution photocatalyst prepared according to an embodiment of the present invention to the comedon.

7, the photocatalyst is applied at a magnification of 100 times and 1000 times, respectively, while photographing before application of the nano-solution photocatalyst on the cotton cloth and placing it on the upper side, and photographing after application and placing it on the lower side, and the photocatalyst is applied relatively evenly it can be seen that

Although the present invention has been described in detail with respect to the described embodiments, it is obvious to those skilled in the art that various changes and modifications are possible within the scope of the technical spirit of the present invention, and it is natural that such variations and modifications belong to the appended claims.

1000: nanoparticles

Claims (20)

a first step of preparing a photocatalyst material in which impurities are removed and the particle diameter is micrometer size;
a second process of manufacturing the micrometer-sized photocatalyst material prepared in the first process by pulverizing the photocatalyst material having a particle diameter of nanometers in a room temperature environment;
a third process of preparing a photocatalyst mixed powder material by mixing a binder and a desiccant with the nanometer-sized photocatalyst material produced in the second process;
a fourth process of injecting the photocatalyst mixed powder material prepared in the third process into a tablet-shaped mold and molding it into a tablet; A method for producing a nano-solution precursor tablet of photocatalysis comprising a.
The method of claim 1,
a fifth process of drying the tablet molded in the fourth process in an environment of 30 to 70 degrees Celsius and a humidity of 10% or less for 2 to 3 hours; Nano solution precursor tablet manufacturing method of the photocatalytic action further comprising a.
3. The method of claim 2,
a sixth process of packaging the tablet dried in the fifth process in a vacuum state; Nano-solution precursor tablet manufacturing method of the photocatalytic action further included.
4. The method of claim 3,
The third process is
Photocatalytic nano solution precursor tablet manufacturing method, characterized in that further mixing sodium chlorite and citric acid.
5. The method according to any one of claims 1 to 4,
The micrometer-sized photocatalyst prepared in the first step has an average diameter in the range of 400 to 600 micrometers.
5. The method according to any one of claims 1 to 4,
The photocatalyst prepared in the second process has an average diameter in the range of 10 to 30 nanometers.
7. The method of claim 6,
The photocatalyst is a nano solution precursor tablet manufacturing method of photocatalysis, characterized in that it is prepared in an environment in the range of 100 to 250 gravitational acceleration.
5. The method according to any one of claims 1 to 4,
The binder is
A method for manufacturing a nano-solution precursor tablet with photocatalysis, characterized in that it is made of a silica-based inorganic binder or starch that is environmentally friendly and harmless to the human body.
5. The method according to any one of claims 1 to 4,
The fourth process is
The photocatalyst mixed powder material is put into a tablet-shaped mold, using a press of 0.1 to 1 ton, and applying pressure for 0.1 to 2 seconds to form a photocatalytic nanosolution precursor tablet manufacturing method.
4. The method of claim 3,
A seventh process of removing the packaging of the tablet packaged in the sixth process, injecting the extracted tablet into purified water, and spraying the resulting nano solution in the air or around a pollutant or polluted environment; Photocatalytic nano solution precursor tablet manufacturing method, characterized in that it further comprises.
Claims 1 to 4, wherein any one of the photocatalytic nano solution precursor tablet prepared according to any one of claims.
12. The method of claim 11,
The photocatalytic nano solution precursor tablet is
Based on the weight of purified water to be mixed
0.1 to 0.23 Wt% of the binder;
5 to 30 Wt% of a desiccant;
1 to 5 Wt% of titanium oxide photocatalyst; A nano solution precursor tablet with photocatalysis, characterized in that it is manufactured by compression molding the mixed photocatalyst powder.
13. The method of claim 12,
The photocatalyst powder is
Photocatalytic nano solution precursor tablet, characterized in that it is made by further mixing sodium chlorite and citric acid.
14. The method according to claim 12 or 13,
Photocatalytic nanosolution precursor tablet, characterized in that it consists of adding 5 to 40 Wt% of ethanol based on the weight of the purified water before injecting the photocatalytic nanosolution precursor tablet into purified water and spraying.
14. The method according to claim 12 or 13,
The absorbent is a photocatalytic nano solution precursor tablet, characterized in that any one or any one or more selected from bentonite, zeolite, calcium chloride, silica gel made of a natural mineral is mixed.
16. The method of claim 15,
The desiccant is added to the mixer together with the nanoparticle-sized photocatalyst in a separate separate process, and the mixer is mixed in the range of 100 to 250 gravitational death speed for 5 to 10 minutes, and the photocatalyst is introduced into the inner cavity of the absorbent A nano-solution precursor tablet of photocatalysis, characterized in that it is prepared with.
16. The method of claim 15,
The binder is
Photocatalytic nano solution precursor tablet, characterized in that it consists of any one selected from vegetable starch, natural alginic acid, and PVA, which is natural and harmless to the human body.
14. The method of claim 13,
The sodium chlorite is
Photocatalytic action, characterized in that it is added with a binder of nanoparticle size to a separately prepared mixer, and the mixer is mixed in a range of 100 to 250 gravitational acceleration for 5 to 60 seconds, and the binder is prepared in a state in which the binder is coded on the outer surface Nanosolution Precursor Tablet.
14. The method of claim 13,
The citric acid is
Photocatalytic action, characterized in that it is added with a binder of nanoparticle size to a separately prepared mixer, and the mixer is mixed in the range of 100 to 250 gravitational acceleration for 5 to 60 seconds, and the binder is coated on the outer surface. Nanosolution Precursor Tablet.
14. The method of claim 13,
The sodium chlorite and citric acid are mixed in a 3:1 molar ratio and mixed in the molar ratio to 0.1 to 0.25 Wt% based on purified water to be mixed with the photocatalyst powder to prepare a photocatalytic nano solution precursor tablet .

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