KR102176316B1 - Artificial turf comprising photocatalys and manufacturing method thereof - Google Patents

Abstract

The present invention relates to an artificial turf formed of a pile layer and a support layer containing synthetic resin, wherein a photocatalyst is contained in the pile layer or the support layer, or the synthetic resin contained in the pile layer and the support layer, wherein the photocatalyst is an inorganic oxide; And an inorganic oxide-based photocatalyst including a ferrocene-derived iron oxide layer formed on the inorganic oxide. It relates to an artificial turf containing a photocatalyst.

Description

Artificial turf containing a photocatalyst and its manufacturing method {ARTIFICIAL TURF COMPRISING PHOTOCATALYS AND MANUFACTURING METHOD THEREOF}

The present invention relates to an artificial turf containing a photocatalyst and a method for manufacturing the same, and more particularly, to an artificial turf containing a photocatalyst having excellent antibacterial and atmospheric purification efficiency by using a photocatalyst in which the photocatalyst is activated in the visible light region, and a method of manufacturing the same. will be.

Artificial turf is a substitute for artificial turf made of synthetic fiber in the shape of turf. Since it was first manufactured in the United States in 1956, it has been mainly used in sports fields such as baseball, soccer, and golf, and furthermore, it is impossible to grow turf. It can be used in places such as indoor gardens or outdoor areas facing the north of high-rise buildings where sunlight hours are extremely limited.

As shown in FIG. 1, in general, support layers 10 and 30 are formed on the ground of artificial turf 100, and a turf-shaped pile layer 20 is formed on the support layer, and the support layer is a bubble for simulating the pile layer 20. It is composed of an elastic layer 30 that imparts elasticity of the layer 10 and the artificial turf and prevents the pile layer from being separated from the foam layer.

The turf-shaped pile layer 20 and the foam layer 10 are made of polyester resin or polyolefin resin, and the elastic layer 30 is acrylic resin latex, polyurethane latex, or styrene-butadiene rubber (SBR ) It is formed of latex or the like.

The artificial turf constructed as described above is formed in a large area in indoor and outdoor playgrounds, and it is not easy to manage such as cleaning or repair.

Therefore, artificial turf containing a photocatalyst has been developed for the recently developed artificial turf to prevent damage by bacteria and to have an antibacterial function.

Republic of Korea Patent No. 1651461 discloses an artificial turf having an antibacterial effect through a photocatalyst by containing a photocatalyst in a polyolefin-based resin forming the artificial turf.

The photocatalyst is a material that has catalytic activity by absorbing light energy, and is a substance that oxidizes and decomposes environmental pollutants such as organic substances with strong oxidizing power by catalytic activity, and is a vapor or liquid organic substance adsorbed on the surface of the photocatalyst with strong oxidizing power, that is, When applied to artificial turf, it has the ability to decompose and sterilize difficult-to-injury organic matter. In addition to its antibacterial action, it prevents air pollution and decomposes contaminants to make cleaning easier.

The photocatalyst used in Korean Patent No. 16521461 is titanium dioxide (TiO ₂ ), and titanium dioxide (TiO ₂ ) is harmless to the human body, has excellent photocatalytic activity, has excellent light corrosion resistance, and is inexpensive, but titanium dioxide is The photocatalytic effect occurs only when the artificial turf containing titanium dioxide is installed outdoors by absorbing ultraviolet rays of 388 nm or less, and the photocatalytic efficiency is not high because the photocatalyst is activated shortly.

The present invention was invented to solve the problems of the prior art as described above.The artificial turf contains a photocatalyst having excellent photocatalytic activity in the visible light range, so that the artificial turf containing a photocatalyst having excellent photocatalytic efficiency no matter where it is installed indoors or outdoors. It is an object of the present invention to provide a grass manufacturing method.

In addition, an object of the present invention is to provide an artificial turf containing a photocatalyst having excellent photocatalytic activity in the visible light region using an inorganic oxide-based photocatalyst formed by introducing a ferrocene doping process.

The present invention provides a method for manufacturing an artificial turf formed by a pile layer and a support layer containing synthetic resin, comprising: a photocatalyst adding step of adding a photocatalyst to the synthetic resin; A construction part manufacturing step of manufacturing a pile layer or a support layer or a pile layer and a support layer with a synthetic resin containing a photocatalyst; And an artificial turf forming step of forming artificial turf with the pile layer and the support layer, wherein the photocatalyst is an inorganic oxide; And an inorganic oxide-based photocatalyst comprising a ferrocene-derived iron oxide layer formed on the inorganic oxide. It provides a method for producing artificial turf containing a photocatalyst.

In addition, the synthetic resin provides a method for producing artificial turf containing a photocatalyst, characterized in that the synthetic resin is any one or a mixture of two or more selected from polyester-based resin, polyamide-based resin, polyolefin-based resin, and polyurethane-based resin.

In addition, the photocatalyst provides a method for producing artificial turf containing a photocatalyst, characterized in that 0.5 to 2% by weight is contained in the synthetic resin.

In addition, it provides a method for producing artificial turf containing a photocatalyst, characterized in that the iron content in the ferrocene-derived iron oxide layer is 0.001 to 10% by weight compared to the inorganic oxide.

In addition, the ferrocene-derived iron oxide layer provides a method for producing artificial turf containing a photocatalyst, characterized in that the ferrocene deposited on the inorganic oxide is heat treated.

In addition, the inorganic oxide provides a method for producing artificial turf containing a photocatalyst, characterized in that it contains at least one selected from the group consisting of oxides containing at least one of Ti, Zn, Al, and Sn.

In addition, the inorganic oxide-based photocatalyst provides a method for producing artificial turf containing a photocatalyst, characterized in that it has photoactivity in a visible light range of 400 nm or more.

In addition, the inorganic oxide-based photocatalyst provides a method for producing artificial turf containing a photocatalyst, characterized in that it has photoactivity in a dry condition of 30% or less humidity.

In addition, it provides an artificial turf containing a photocatalyst, characterized in that produced by the artificial turf manufacturing method described above.

As described above, the present invention uses an inorganic oxide-based photocatalyst formed by introducing a ferrocene doping process, thereby exhibiting excellent photocatalytic activity in the visible region.

In addition, the present invention contains a photocatalyst having excellent photocatalytic activity in the visible light region in artificial turf, so that no matter where it is installed indoors or outdoors, the photocatalytic efficiency is excellent.

In addition, the artificial turf containing the photocatalyst of the present invention has antibacterial properties due to high photocatalytic activity, and has an effect of having an air purification function.

1 shows a general structure of artificial turf.
2 is a flowchart illustrating a method of manufacturing an inorganic oxide-based photocatalyst according to the present invention according to an embodiment of the present invention.
3 illustrates an exemplary configuration of a TR-CVD reactor used in the manufacturing process of an inorganic oxide-based photocatalyst according to the present invention according to an embodiment of the present invention.
4 is an exemplary view showing a manufacturing process of an inorganic oxide-based photocatalyst according to the present invention according to an embodiment of the present invention.
5 shows an image of an inorganic oxide-based photocatalyst prepared according to an embodiment of the present invention.
6 shows a TEM image of an inorganic oxide-based photocatalyst prepared according to an embodiment of the present invention.
7 shows the evaluation results of the photolysis performance of the inorganic oxide-based photocatalyst prepared according to an embodiment of the present invention.
8 shows the evaluation result of the photolysis performance according to the humidity of the inorganic oxide-based photocatalyst prepared according to an embodiment of the present invention.
9 shows the stability evaluation results of photolysis performance according to repeated photolysis experiments of an inorganic oxide-based photocatalyst prepared according to an embodiment of the present invention.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. First of all, it should be noted that in the drawings, the same components or parts represent the same reference numerals as possible. In describing the present invention, detailed descriptions of related known functions or configurations are omitted so as not to obscure the subject matter of the present invention.

As used herein, the terms "about", "substantially" and the like are used at or close to the numerical value when manufacturing and material tolerances specific to the stated meaning are presented, and are used in the sense of the present invention. To assist, accurate or absolute figures are used to prevent unfair use of the stated disclosure by unscrupulous infringers.

Throughout the specification, when a member is said to be positioned "on" another member, this includes not only the case where a member is in contact with another member, but also the case where another member exists between the two members.

Throughout the specification, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components.

The present invention relates to artificial turf containing a photocatalyst in the artificial turf formed of a pile layer and a support layer containing synthetic resin.

The pile layer is a constituent part showing the shape of a turf, and the support layer is formed on the ground and may include a foam layer and an elastic layer as a layer for modeling the pile layer, and a filling layer may be further formed under the elastic layer depending on the use. There will be.

The method for manufacturing artificial turf containing a photocatalyst of the present invention is manufactured including a photocatalyst addition step, a component manufacturing step, and an artificial turf forming step.

The photocatalyst addition step is a step of adding a photocatalyst to the synthetic resin, and any synthetic resin suitable for the artificial turf can be used as the synthetic resin that forms the artificial turf. Polyester resin, polyamide resin, polyolefin resin, polyurethane resin Any one selected from or a mixture of two or more may be used.

The manufacturing step of the component part is a step of preparing a pile layer, a support layer, or a pile layer and a support layer with a synthetic resin containing a photocatalyst.

The photocatalyst may be contained in the pile layer, the support layer, or the synthetic resin forming the pile layer and the support layer, and the photocatalyst may be contained only in the pile layer depending on the place and use where the artificial turf is installed, and may be contained only in the support layer. have.

In addition, it may be possible to contain a photocatalyst in both the pile layer and the support layer.

In addition, it may be possible to contain the photocatalyst only in some components of the pile layer and the support layer.

In addition, the artificial turf of the present invention may be formed of synthetic resins having different pile layers and support layers.

The photocatalyst of the present invention may include an inorganic oxide and a ferrocene-derived iron oxide layer formed by a ferrocene doping process as an inorganic oxide-based photocatalyst.

The ferrocene-derived iron oxide layer is formed as a coating layer on the inorganic oxide, and can improve light absorption and photocatalytic efficiency in a visible light region.

The inorganic oxide is an inorganic semiconductor compound that absorbs light energy and exhibits catalytic activity. For example, Ti, Zn, Al, Fe, W, Sn, Bi, Ta, Cu, Si, Ru, Sr, Ba and Ce It is an oxide containing at least one selected from the group consisting of, preferably Ti, Zn, Al and Sn. Specifically, TiO ₂ , Al ₂ O ₃ , ZnO ₂ , ZnO, SrTiO ₃ , Fe ₂ O ₃ , Ta ₂ O ₅ , WO ₃ , SnO ₂ , Bi ₂ O ₃ , NiO, Cu ₂ O, SiO, SiO ₂ , MoS ₂ , InPb, RuO ₂ , CeO _{2 and the} like. In addition, semiconductor compounds such as CdS, GaP, InP, GaAs, InPb, etc. may be further included in addition to oxides.

The inorganic oxide includes at least one selected from the group consisting of beads, powder, rod, wire, needle, and fiber, and the size of the inorganic oxide is 1 nm or more; 10 nm or more; 30 nm to 500 μm; 30 nm to 100 μm; Alternatively, it may be 30 nm to 1 μm. The size may mean diameter, thickness, length, etc. depending on the shape.

The ferrocene-derived iron oxide layer is formed by a ferrocene doping process. For example, the ferrocene layer formed on the inorganic oxide may be heat-treated to thermally decompose ferrocene, and iron oxide converted from ferrocene may be included by this pyrolysis process. The ferrocene doping process will be described in more detail in the following manufacturing method.

The ferrocene-derived iron oxide is an iron oxide derived from at least one of ferrocene and ferrocene derivatives, and the ferrocene derivative is ferrocene aldehyde, ferrocene ketone, ferrocene carboxylic acid, ferrocene alcohol, phenol or ether compound, nitrogen-containing ferrocene compound, Sulfur-containing ferrocene compound, phosphorus-containing ferrocene compound, silicon-containing ferrocene compound, 1,1'-dicopper ferrocene (1,1'-di-copper ferrocene), ferrocene boric acid, ferrocenyl Q It may include at least one selected from the group consisting of ferrocenyl cuprous acetylide and bisferrocenyl titanocene.

The iron content in the ferrocene-derived iron oxide layer is 0.001 to 10% by weight compared to the inorganic oxide; 0.01 to 10% by weight; 0.01 to 3% by weight; 0.01 to 1.5% by weight; Or it may be included in 0.01 to 1% by weight. If included within the above range, photocatalytic activity may be increased in the visible light region to improve photolysis efficiency. In addition, if the iron content is increased, absorption in the visible light region may increase, but since the photocatalytic activity may decrease due to such an increase in iron content, it is preferable to include the iron content within the above range, and more preferably the above. The content of iron may be 0.01 to 1% by weight.

The ferrocene-derived iron oxide layer is 0.01 nm or more; 0.1 nm or more; 10 nm or more; Alternatively, it may have a thickness of 1 nm to 100 nm. When included within the above thickness range, it is possible to prevent a decrease in porosity of the photocatalyst due to an increase in the thickness of the coating layer, and increase the amount of adsorption of moisture, OH- ions, and decomposition targets on the surface, thereby improving photolysis performance. In addition, the ferrocene-derived iron oxide layer, 0.01 nm or more; 0.1 nm or more; 10 nm or more; Or it may include ferrocene-derived iron oxide having a size of 1 nm to 100 nm. The size may mean length, diameter, thickness, etc. depending on the shape.

The ferrocene-derived iron oxide may include one or more of the compounds represented by the following formula (1).

[Formula 1]

Fe _x O _Y H _Z

Here, X, Y, and Z are each selected from 0 to 3, and X and Y are not 0. That is, iron oxide (Fe _x O _y H _z ), which is a stable and inexpensive semiconducting material that absorbs light in the visible light region, is introduced into the surface of TiO _{2 in the} form of nano-sized particles to form a photocatalyst that is sensitive to visible light. I can.

The inorganic oxide-based photocatalyst of the present invention expands a wavelength region exhibiting a photoreaction by absorbing light from ultraviolet light to visible light, and exhibits excellent photocatalytic activity, particularly in a visible light range of 400 nm or more.

In addition, the photocatalytic reactivity capable of adsorbing and decomposing decomposition targets on the surface is improved, so that photocatalytic activity is obtained in various humidity regions, and excellent photocatalytic activity can be exhibited even in dry conditions of 30% or less humidity.

The inorganic oxide-based photocatalyst of the present invention is 5 (m ² /g) or more; 5 (m ² /g) to 1000 (m ² /g); Alternatively, it may have a specific surface area of 5 (m ² /g) to 100 (m ² /g), and the average pore size may be 50 nm or less. That is, by introducing ferrocene-derived iron oxide to the surface, the amount of adsorption of the decomposition target is increased on the surface of the photocatalyst, and the photocatalytic reactivity is increased, thereby improving the efficiency of the photocatalyst.

The inorganic oxide-based photocatalyst of the present invention may be activated through sunlight or visible light to decompose various harmful substances.

The artificial turf having a photocatalytic function including an inorganic oxide-based photocatalyst according to the present invention may exhibit an air purification function as well as decomposition of harmful substances. For example, it will have a photolysis function and/or an air purification function by photoactivation of volatile substances, odor substances, and pollutants.

It is preferable that the photocatalyst of the artificial turf containing the photocatalyst of the present invention is contained in a synthetic resin in an amount of 0.5 to 2% by weight.

If the content of the photocatalyst is less than 0.5% by weight, the content of the photocatalyst is low, and the efficiency of decomposing harmful substances and air purification may be lowered due to photocatalytic activity.If the content of the photocatalyst exceeds 2% by weight, the efficiency of decomposing harmful substances and air purification is greatly increased. And the physical properties of artificial turf may be deteriorated.

The method of manufacturing an inorganic oxide-based photocatalyst of the present invention comprises the steps of preparing an inorganic oxide as shown in FIG. 2; Forming a ferrocene layer on the inorganic oxide; And forming a ferrocene-derived iron oxide layer by heat treatment after the step of forming the ferrocene layer.

The preparing of the inorganic oxide is a step of preparing an inorganic oxide dispersion or applying the inorganic oxide on a substrate, and the dispersion is applied with an aqueous solvent, an oil solvent, or a mixture of both, and the substrate is a silicon substrate , A wafer, a glass substrate, a semiconductor substrate, a metal substrate, and the like. The inorganic oxide may be applied by spin coating, roll coating, spray coating, dip coating, flow coating, doctor blade method, or the like.

In the step of forming the ferrocene layer, a ferrocene film may be formed using a wet coating method, a sputtering method, or a vapor deposition method. Preferably, a deposition method such as ALD (atomic layer deposition), CVD (temperature-regulated chemical vapor deposition) is used, and more preferably, TR-CVD (temperature-regulated chemical vapor deposition) is used. A ferrocene layer can be formed. When TR-CVD is applied, the amount of iron oxide deposited on the inorganic oxide can be easily controlled through the control of the amount of ferrocene, and the manufacturing process of the photocatalyst can be simplified and the photocatalyst can be efficiently provided.

The step of forming the ferrocene layer is carried out at room temperature to 120 ℃, preferably 40 ℃ to 100 ℃; More preferably, it may be carried out at 60 ℃ to 100 ℃. That is, when TR-CVD is applied, it may be carried out at 60° C. to 100° C. in order to induce deposition by the vaporization process of ferrocene.

The step of forming the ferrocene layer may be performed in an air or oxygen atmosphere under atmospheric conditions, and may further include an inert gas.

In the forming of the ferrocene layer, the ferrocene layer including 0.01% to 20% by weight of ferrocene relative to the inorganic oxide may be formed.

In the step of forming the ferrocene-derived iron oxide layer of the present invention, the ferrocene layer may be partially or completely oxidized to iron oxide through heat treatment, and impurities such as carbon residue may be removed.

The step of forming the ferrocene-derived iron oxide layer, 50 ℃ to 900 ℃; Alternatively 100° C. to 800° C.; It can be heat-treated in two or more steps at temperature.

For example, the step of forming the ferrocene-derived iron oxide layer includes a step of performing a first heat treatment at a temperature of 100°C to 300°C and a step of performing a second heat treatment at a temperature of 300°C to 900°C, each step being different from each other It can be heat treated at temperature. Each of the steps is carried out for 1 minute to 20 hours, respectively, by air, 20% or more; It may be carried out in an air or inert gas atmosphere containing 40% or more oxygen.

That is, the step of performing the first heat treatment may be an annealing process for depositing iron oxide in which ferrocene is converted to iron oxide by a reaction of oxygen. The second heat treatment step may be a post heat treatment step after the first heat treatment step, and may be an annealing process for improving the activity and performance of the photocatalyst by removing impurities such as carbides.

Hereinafter, the present invention will be described in more detail by examples and comparative examples.

However, the following examples are for illustrative purposes only, and the contents of the present invention are not limited to the following examples.

◎ Photocatalyst manufacturing

Example 1

By using a TR-CVD (temperature controlled chemical vapor deposition) reactor of Figure 3 utilizes a temperature controlled chemical vapor deposition as shown in Figure 4 was prepared in the photocatalyst (Fe-TiO ₂₎ of the iron oxide particles in the nano-scale deposited on the TiO ₂ . More specifically, 0.02 g of ferrocene, a precursor of iron, is placed in a container made of quartz on the inner bottom of a reactor made of stainless steel surrounded by a heating band. After placing 3 g of TiO ₂ (TiO ₂ , P-25, Evonik, particle size: 25 nm) in the center of the reactor in a container made of stainless steel wire mesh, the reactor is sealed with polyimide tape. The ferrocene deposition process was performed by the TR-CVD vaporization process at 60° C. for 2 hours at the temperature of the reactor, and then, the temperature was raised to 200° C. and maintained for 12 hours to convert to iron oxide.

Then prepare a final iron oxide -TiO ₂ hybrid photocatalytic nano-structure (or, expressed as Fe-TiO ₂₎ by an additional heat treatment for 2 hours at 750 ℃ in dry air gas atmosphere to remove the TiO _2. The content of iron deposited on TiO ₂ under this condition is about 0.09 wt%.

Example 2

An iron oxide-TiO ₂ hybrid nanostructure photocatalyst was prepared in the same manner as in Example 1, except that 0.05 g of the iron precursor Ferrocene was applied. The content of iron deposited on TiO ₂ under this condition is about 0.13 wt%.

Example 3

An iron oxide-TiO ₂ hybrid nanostructured photocatalyst was prepared in the same manner as in Example 1, except that 0.1 g of the iron precursor Ferrocene was applied. The content of iron deposited on TiO ₂ under this condition is about 0.65 wt%.

Example 4

An iron oxide-TiO ₂ hybrid nanostructure photocatalyst was prepared in the same manner as in Example 1, except that 0.3 g of the iron precursor Ferrocene was applied. The content of iron deposited on TiO ₂ under this condition is about 1.81 wt%.

The prepared photocatalyst (Fe-TiO ₂ ) was compared with a TiO ₂ photocatalyst coated with a general iron oxide, and transparency and color were compared and shown in FIG. 5. 5, the photocatalyst coated with ferrocene-derived iron oxide according to the present invention (Fe-TiO ₂ ) is transparent and softer than the photocatalyst coated with iron oxide (Fe ₂ O ₃ ) (Fe ₂ O ₃ -TiO ₂ ). It can be seen that it has a yellow color.

A TEM image (an image measured by a transmission electron microscope) of the prepared photocatalyst (Fe-TiO ₂ ) was measured and shown in FIG. 6. 6 shows that as the iron content decreases, the size of the iron oxide particles deposited on the surface of Fe-TiO ₂ decreases.

The specific surface area (BET) and BJH average pore size through nitrogen adsorption analysis of the prepared photocatalyst (Fe-TiO ₂ ) were measured and shown in Table 1.

0.13 wt% Fe-TiO ₂ 0.65 wt% Fe-TiO ₂ 1.81 wt% Fe-TiO ₂ BET Surface area(m ² /g) 11.6259 10.3426 8.3939 BJHAdsorption average pore size(nm) 13.2 12.5 13.9

Looking at Table 1, it can be seen that even when the iron content of Fe-TiO ₂ changes, the specific surface area and the average pore size do not change significantly, and it can be seen that the mesopores of Fe-TiO ₂ are formed.

◎ Photocatalyst evaluation

Evaluation Example 1

The photocatalyst (Fe-TiO ₂ ) of Example 1 was put in a 5.3 L batch reactor with a volume of quartz glass on the top, and the initial concentration of acetaldehyde was 66 ppm, and dry air (relative humidity: -33%, total pressure was 760). torr) and a white LED at room temperature to investigate the photodecomposition properties of acetaldehyde. Acetaldehyde in the reactor was visually measured using gas chromatography. The results are shown in FIG. 7.

FIG. 7 is a graph showing (a) a change in the number of moles of acetaldehyde, and (b) a change in the number of moles of carbon dioxide generated as a result of the photolysis reaction of acetaldehyde according to the irradiation time of visible light (white light) under a humidity condition of 33%, and FIG. 7 Looking at, it can be seen that the photocatalyst (Fe-TiO ₂ ) prepared in Example is photodegraded by photocatalytic activity by irradiation with visible light (white light), and the decomposition efficiency in visible light when the ferrocene deposition amount is 0.09 wt%. You can see the biggest one. In addition, it can be seen that as the iron content decreases, the acetaldehyde photolysis rate of Fe-TiO ₂ increases.

Evaluation Example 2

The photocatalyst (Fe-TiO ₂ ) having a deposition amount of ferrocene of 0.13 wt% was analyzed for photodecomposition properties of acetaldehyde in the same manner as in Evaluation Example 1 in a dry condition without humidity and a humidity condition of ~33%. Acetaldehyde and carbon dioxide in the reactor were periodically measured using gas chromatography. The results are shown in FIGS. 8 and 9.

FIG. 8 shows a change in the number of moles of carbon dioxide generated as a result of (a) the number of moles of acetaldehyde and (b) the number of moles of carbon dioxide generated as a result of the photolysis reaction of acetaldehyde according to the visible light irradiation time when the acetaldehyde photolysis experiment was conducted under dry conditions and 33% humidity 8, the slopes of the two graphs were similar in the same acetaldehyde concentration section indicated by the dotted line, and it shows that the acetaldehyde photolysis activity remains similar in visible light irradiation regardless of the presence or absence of humidity.

In addition, it can be seen that the generation of carbon dioxide increases with the light irradiation time, which is the generation of carbon dioxide by complete oxidation of acetaldehyde.

9 shows the change in the number of moles of carbon dioxide generated as a result of (a) the number of moles of acetaldehyde and (b) the change in the number of moles of carbon dioxide according to the time of irradiation with visible light when repeatedly used in the acetaldehyde photolysis experiment under 33% humidity conditions. It is a graph shown, and it can be seen from FIG. 9 that high photocatalytic activity is maintained even in repeated photolysis experiments.

In general, in the present invention, TiO ₂ on which iron oxide is deposited (hereinafter, Fe-TiO ₂ ) was used in the photolysis experiment of acetaldehyde, one of the representative volatile organic compounds, and the photolysis activity of acetaldehyde of Fe-TiO ₂ according to the content of iron oxide Was compared. As a result, when the iron content was as low as about 0.09 wt%, the photolysis activity of acetaldehyde of Fe-TiO ₂ was highest, and about 70% of the initial acetaldehyde concentration (~95 mol ppm) decreased within 20 hours.

In addition, in general, the activity of the photocatalyst is greatly affected by humidity, but Fe-TiO ₂ prepared in the present invention showed similar catalytic activity under dry and humidity conditions, confirming that the photocatalytic activity is not sensitive to humidity. As a result of conducting nitrogen adsorption experiments of Fe-TiO ₂ having various iron contents, it was confirmed that the iron content did not significantly affect the total specific surface area of the photocatalyst.

In addition, as the photocatalytic activity of Fe-TiO ₂ was greatly influenced by the iron content, it can be seen that the electronic structure of the interface between the deposited iron oxide nanoparticles and TiO ₂ is more important than the surface structure of the photocatalyst. . In addition, it was confirmed through a transmission electron microscope that the smaller the iron content is, the smaller the size of the iron oxide particles present on the surface. When the iron oxide particles of 1 to 3 nanometers are deposited, the photocatalytic activity can be increased. From the analysis results, when very small iron oxide nanoparticles have a content of about 0.09 wt%, Fe-TiO ₂ absorbs light in the visible light region and separates electron/hole pairs most efficiently, resulting in oxygen/ It reacts with water to produce radicals that can rapidly decompose acetaldehyde. On the other hand, if the target organic material is not completely oxidized but partially oxidized and remains on the surface of the photocatalyst to block the active site, the activity of the photocatalyst decreases, which is pointed out as one of the biggest problems of the photocatalyst. However, it was confirmed that the Fe-TiO ₂ prepared in the present invention maintained the same catalytic activity even in repeated acetaldehyde photolysis experiments, and thus there was no problem of deteriorating catalytic activity.

As described above, the inorganic oxide-based photocatalyst of the present invention is a very excellent photocatalyst that activates the photocatalyst in the visible light region and does not decrease the activity of the photocatalyst according to changes in humidity, and it can be seen that it is a very suitable photocatalyst for artificial turf.

Claims (9)

In the artificial turf manufacturing method formed of a pile layer and a support layer containing synthetic resin,
A photocatalyst adding step of adding a photocatalyst to the synthetic resin;
A construction part manufacturing step of manufacturing a pile layer or a support layer or a pile layer and a support layer with a synthetic resin containing a photocatalyst;
Including an artificial turf forming step of forming artificial turf with the pile layer and the support layer,
The photocatalyst is an inorganic oxide; And characterized in that it is an inorganic oxide-based photocatalyst comprising a ferrocene-derived iron oxide layer formed on the inorganic oxide,
The photocatalyst is characterized in that it contains a photocatalyst, characterized in that 0.5 to 2% by weight contained in the synthetic resin,
In the ferrocene-derived iron oxide layer, the iron content is 0.001 wt% or more and 6.91 wt% or less, or 6.93 wt% or more and 10 wt% or less, compared to the inorganic oxide,
The inorganic oxide is characterized in that it contains at least one selected from the group consisting of oxides containing at least one of Ti, Zn, Al, and Sn, and the inorganic oxide-based photocatalyst includes at least one of 400 nm in visible light It is characterized in that it has photoactivity,
The inorganic oxide-based photocatalyst is characterized in that it has photoactivity in dry conditions of 30% or less, and the inorganic oxide-based photocatalyst has a specific surface area of 5 (m ² /g) or more, and an average pore size of 50 nm. A method for producing artificial turf containing a photocatalyst, characterized in that the following. The method of claim 1,
The synthetic resin is a method for producing artificial turf containing a photocatalyst, characterized in that the synthetic resin is any one selected from among polyester resins, polyamide resins, polyolefin resins, and polyurethane resins or a mixture of two or more. delete delete The method of claim 1,
The ferrocene-derived iron oxide layer is a method for producing artificial turf containing a photocatalyst, characterized in that the ferrocene deposited on the inorganic oxide is heat treated. delete delete delete An artificial turf containing a photocatalyst, characterized in that it is produced by the method of manufacturing an artificial turf according to claim 1 or 2 or 5.

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