JP7549319B2 - Aldehyde remover - Google Patents

Description

The present invention relates to a material that removes aldehydes (hereinafter referred to as an "aldehyde remover").

Volatile aldehydes (more specifically, formaldehyde, acetaldehyde, etc.) are contained in combustion gases such as automobile exhaust fumes, and are perceived as a pungent odor. Some fruits and vegetables also generate acetaldehyde. The acetaldehyde generated from fruits and vegetables promotes the production of ethylene in the fruit and vegetables. As a result, the ethylene generated by the fruits and vegetables can cause the freshness of the fruits and vegetables to decrease in a short period of time. Therefore, it is desirable to remove aldehydes from the living environment.

For example, Patent Document 1 describes a freshness-preserving agent that maintains the freshness of fruits and vegetables by breaking down ethylene and acetaldehyde. The freshness-preserving agent described in Patent Document 1 contains palladium as an essential component, and removes ethylene and acetaldehyde by breaking them down into substances that are harmless to fruits and vegetables.

Japanese Patent Application Publication No. 4-293448

However, the technology described in Patent Document 1 leaves room for improvement in terms of efficiently removing aldehydes.

The present invention was made in consideration of the above problems, and its purpose is to provide an aldehyde remover that can efficiently remove aldehyde.

The aldehyde remover of the present invention includes a substrate, and tannin and an oxide attached to the surface of the substrate. The oxide includes at least one selected from the group consisting of alumina, silica, and iron (III) oxide.

In one embodiment, the oxide includes alumina.

In one embodiment, the oxide includes the alumina and the iron(III) oxide.

In one embodiment, the oxides include the alumina, the iron(III) oxide, and the iron(II) oxide.

In one embodiment, the oxides include the alumina, the iron(III) oxide, and the silica.

The aldehyde remover according to one embodiment further comprises L-proline attached to the surface of the substrate, and the oxide comprises at least one selected from the group consisting of alumina and silica, iron oxide (III), and iron oxide (II).

In one embodiment, the amount of L-proline is 50.0 ng or more and 200.0 ng or less per cm ² of the surface of the substrate.

In one embodiment, the amount of tannin is from 100 μg to 500 μg per cm ² of the surface of the substrate.

In one embodiment, the amount of the oxide is 7.5 ng or more and 50.0 ng or less per cm ² of the surface of the substrate.

The aldehyde remover of the present invention can efficiently remove aldehyde.

FIG. 1 is a partial cross-sectional view illustrating an example of an aldehyde remover according to an embodiment of the present invention. FIG. 2 is a partial cross-sectional view illustrating a schematic diagram of another example of an aldehyde remover according to an embodiment of the present invention. FIG. 2 is a partial cross-sectional view illustrating a schematic diagram of yet another example of an aldehyde remover according to an embodiment of the present invention. FIG. 2 is a partial cross-sectional view illustrating a schematic diagram of yet another example of an aldehyde remover according to an embodiment of the present invention.

The following describes preferred embodiments of the present invention. However, the present invention is not limited to the following embodiments, and can be implemented in various forms without departing from the spirit of the invention. Note that where explanations overlap, they may be omitted as appropriate.

First, the terms used in this specification are explained. "Aldehyde" is a general term for compounds having an aldehyde group (-CHO). Examples of aldehydes include formaldehyde, acetaldehyde, and propionaldehyde.

"A substance adheres to the surface of a substrate" includes two cases: "a substance adheres directly to the surface of a substrate" and "a substance adheres indirectly to the surface of a substrate." Thus, for example, "tannin adheres to the surface of a substrate" includes two cases: "tannin adheres directly to the surface of a substrate" and "tannin adheres indirectly to the surface of a substrate via another substance (e.g., an oxide, etc.)."

Unless otherwise specified, the measured value of the mass average molecular weight (Mw) is a value measured using gel permeation chromatography.

<Aldehyde removal material>
The aldehyde removing material according to the present embodiment will be described below with reference to the drawings. Note that the drawings are mainly schematic illustrations of the respective components for ease of understanding, and the size, number, shape, etc. of each illustrated component may differ from the actual ones for the convenience of drawing.

Figure 1 is a partial cross-sectional view showing a schematic example of an aldehyde remover according to this embodiment. The aldehyde remover 10 shown in Figure 1 includes a substrate 11, a tannin 12, and an oxide 13. Both the tannin 12 and the oxide 13 are attached to the surface 11A of the substrate 11. The oxide 13 includes at least one selected from the group consisting of alumina, silica, and iron (III) oxide.

The aldehyde remover 10 according to this embodiment has the above-mentioned configuration, and can therefore efficiently remove aldehyde. The reason for this is believed to be as follows.

In the aldehyde remover 10, tannins 12 and oxides 13 are attached to the surface 11A of the substrate 11. As a result, when the aldehyde remover 10 is placed in an atmosphere containing aldehyde gas, for example, the aldehyde gas is first adsorbed to the tannins 12. Next, the adsorbed aldehyde gas is decomposed by the catalytic action of the oxides 13. For these reasons, the aldehyde remover 10 according to this embodiment can efficiently remove aldehyde. Note that even if the aldehyde remover of the present invention has the configuration shown in any of Figures 2 to 4 described below, it is believed that aldehyde can be efficiently removed for the same reasons as above.

Tannin 12 and oxide 13 are each attached to surface 11A of substrate 11 by, for example, van der Waals forces. In order to more efficiently remove aldehyde, it is preferable that tannin 12 and oxide 13 are attached to surface 11A of substrate 11 in a state of close contact with each other.

In order to more efficiently remove aldehyde, the amount of tannin 12 is preferably 100 μg to 500 μg, more preferably 155 μg to 310 μg, per unit area (per ^cm2 ) of surface 11A of substrate 11. For the same reason, the amount of oxide 13 (when multiple types of oxides are used as oxide 13, the total amount of those oxides) is preferably 7.5 ng to 50.0 ng, more preferably 7.8 ng to 46.8 ng, per unit area (per ^cm2 ) of surface 11A of substrate 11.

It should be noted that the tannin 12 and the oxide 13 do not have to adhere to the entire surface 11A of the substrate 11. However, in order to more efficiently remove aldehyde, it is preferable that both the tannin 12 and the oxide 13 adhere to the entire area of the surface 11A of the substrate 11 that comes into contact with the aldehyde.

Below, we will explain each element that makes up the aldehyde remover 10.

[Substrate]
The constituent material of the substrate 11 is not particularly limited as long as it can adhere the tannin 12 and the oxide 13, and examples of the material include paper (more specifically, paper rags, etc.), cloth, and resin. The shape of the substrate 11 is also not particularly limited, and a sheet-like, bag-like, or other shape can be selected depending on the application.

[Tannin]
Examples of tannin 12 include hydrolyzable tannins and condensed tannins. In order to more efficiently remove aldehydes, condensed tannins are preferred as tannin 12. Condensed tannins are represented by the following formula (1). Condensed tannins are usually obtained as a mixture of condensates having different degrees of polymerization (specifically, the numerical value represented by n in the following formula (1)).

In the formula (1), ^R1 and ^R2 each independently represent a hydrogen atom or a hydroxyl group. ^R3 represents a hydrogen atom or a monovalent group represented by the following formula (2). n represents an integer of 2 to 10. Multiple ^R1s may be the same or different from each other. Multiple ^R2s may be the same or different from each other. Multiple ^R3s may be the same or different from each other.

In the formula (2), * represents the site of bonding to the oxygen atom.

To remove aldehydes more efficiently, the mass average molecular weight of tannin 12 is preferably 10,000 to 1,000,000, more preferably 10,000 to 100,000, and even more preferably 10,000 to 20,000.

[Oxide]
The oxide 13 includes at least one selected from the group consisting of alumina, silica, and iron oxide (III). The oxide 13 may include an oxide other than alumina, silica, and iron oxide (III). An example of an oxide other than alumina, silica, and iron oxide (III) is iron oxide (II). In order to more efficiently remove aldehyde, the total content of alumina, silica, iron oxide (III), and iron oxide (II) is preferably 80% by mass or more and 100% by mass or less, more preferably 90% by mass or more and 100% by mass or less, and even more preferably 95% by mass or more and 100% by mass or less, based on the total mass of the oxide 13.

The oxide 13 is, for example, in the form of particles and adheres to the surface 11A of the substrate 11. Hereinafter, the particulate oxide 13 adhered to the surface 11A of the substrate 11 will be referred to as a specific oxide particle.

The specific oxide particles may be composed of one type of oxide, or may be composed of two or more types of oxides. The number average primary particle diameter of the specific oxide particles is, for example, 0.05 nm or more and 100 μm or less. The number average primary particle diameter of the specific oxide particles is the number average value of the circle equivalent diameter (Heywood diameter: diameter of a circle having the same area as the projected area of the primary particle) of 100 specific oxide particles (primary particles) measured using a scanning electron microscope and image analysis software (for example, "WinROOF" manufactured by Mitani Shoji Co., Ltd.).

To remove aldehyde more efficiently, the oxide 13 preferably contains alumina, more preferably contains alumina and iron(III) oxide, and even more preferably contains alumina, iron(III) oxide, and iron(II) oxide.

In addition, in order to efficiently remove aldehydes in a short time, it is preferable that the oxide 13 contains alumina, iron(III) oxide, and silica.

When oxide 13 contains alumina and oxides other than alumina (hereinafter sometimes referred to as other oxides), in order to more efficiently remove aldehydes, the total amount of the other oxides is preferably 10 parts by mass or more and 300 parts by mass or less, and more preferably 100 parts by mass or more and 300 parts by mass or less, per 100 parts by mass of alumina.

[Use and removal method]
The aldehyde remover 10 can be used as a material for removing aldehyde from the living environment. Since the aldehyde remover 10 can efficiently remove aldehyde, it is suitable as a freshness-preserving material for preserving the freshness of fruits and vegetables (particularly fruits and vegetables that generate acetaldehyde).

Examples of fruits and vegetables that produce acetaldehyde include figs, bananas, mandarins, apples, pineapples, strawberries, grapefruit, kiwi, mangoes, lemons, cucumbers, carrots, cabbage, and tomatoes.

There is no particular limitation on the method of removing aldehyde (aldehyde gas) using the aldehyde remover 10. For example, the aldehyde remover 10 can be placed in an atmosphere containing aldehyde gas, and the temperature of the atmosphere can be adjusted to a range of 2°C or higher and 30°C or lower, thereby removing the aldehyde gas.

[Another example]
Although the aldehyde remover 10 according to this embodiment has been described above with reference to Fig. 1, the present invention is not limited to the aldehyde remover 10 shown in Fig. 1. Below, another example of an aldehyde remover according to an embodiment of the present invention will be described with reference to Figs. 2 to 4. Note that in Figs. 2 to 4, components that are the same as those shown in Fig. 1 are given the same reference numerals as in Fig. 1. Further, below, only configurations that are different from the aldehyde remover 10 shown in Fig. 1 will be described.

In the aldehyde remover 20 shown in FIG. 2, tannin 12 is indirectly attached to the surface 11A of the substrate 11 via an oxide 13. Tannin 12 is attached to the oxide 13 by, for example, van der Waals forces.

In the aldehyde remover 30 shown in FIG. 3, the oxide 13 is indirectly attached to the surface 11A of the substrate 11 via the tannin 12. The oxide 13 is attached to the tannin 12 by, for example, van der Waals forces.

Also, in the aldehyde removal material according to the embodiment of the present invention, two or more of the aspects shown in Figures 1 to 3 may be mixed.

Another example of an aldehyde remover according to an embodiment of the present invention is an aldehyde remover 40 shown in FIG. 4. The aldehyde remover 40 shown in FIG. 4 differs from the aldehyde remover 10 shown in FIG. 1 in that it further contains L-proline 14 attached to the surface 11A of the substrate 11. In order to more efficiently remove aldehydes in the aldehyde remover 40, it is preferable that the tannin 12 and L-proline 14 are attached to the surface 11A of the substrate 11 in a state of close contact with each other. For the same reason, it is preferable that the oxide 13 and L-proline 14 are attached to the surface 11A of the substrate 11 in a state of close contact with each other in the aldehyde remover 40.

In order to more efficiently remove aldehyde in the aldehyde remover 40, the amount of L-proline 14 per unit area (per ^cm2 ) of the surface 11A of the substrate 11 is preferably 50.0 ng or more and 200.0 ng or less, and more preferably 78.0 ng or more and 156.0 ng or less.

In order to more efficiently remove aldehydes in the aldehyde remover 40, the oxide 13 preferably contains iron oxide (III) and iron oxide (II), and more preferably contains at least one selected from the group consisting of alumina and silica, iron oxide (III), and iron oxide (II). In order to more efficiently remove aldehydes in the aldehyde remover 40, the amount of iron oxide (II) is preferably 10 parts by mass or more and 300 parts by mass or less, and more preferably 100 parts by mass or more and 300 parts by mass or less, per 100 parts by mass of iron oxide (III). In addition, in order to more efficiently remove aldehydes in the aldehyde remover 40, the amount of at least one selected from the group consisting of alumina and silica is preferably 10 parts by mass or more and 300 parts by mass or less, and more preferably 100 parts by mass or more and 300 parts by mass or less, per 100 parts by mass of iron oxide (III).

In order to remove aldehydes particularly efficiently in the aldehyde remover 40, it is preferable that the oxide 13 contains iron oxide (III), iron oxide (II), alumina, and silica.

Also, the aldehyde remover according to the embodiment of the present invention may be any one of the following aspects 1) to 4).

1) Tannin 12 is indirectly attached to surface 11A of substrate 11 via at least one of oxide 13 and L-proline 14.
2) The oxide 13 is indirectly attached to the surface 11A of the substrate 11 via at least one of the tannin 12 and L-proline 14.
3) L-proline 14 is indirectly attached to the surface 11A of the substrate 11 via at least one of tannin 12 and oxide 13.
4) Two or more aspects selected from the group consisting of the aspects shown in 1) to 3) above and the aspect shown in FIG. 4 are mixed together.

In any of the above embodiments 1) to 4), the different components are attached to each other by, for example, van der Waals forces.

<Manufacturing method of aldehyde remover>
Next, a preferred method for producing the aldehyde removing material according to the above-described embodiment (more specifically, the aldehyde removing material 10, the aldehyde removing material 20, the aldehyde removing material 30, the aldehyde removing material 40, etc.) will be described. Hereinafter, a description of components that overlap with those of the above-described embodiment will be omitted.

First, the substrate 11 and a treatment liquid (hereinafter, sometimes simply referred to as the "treatment liquid") for producing the aldehyde removal material are prepared. The treatment liquid contains at least an aqueous medium, tannin 12, and oxide 13. Examples of the aqueous medium used in the treatment liquid include distilled water and an acidic aqueous solution. The treatment liquid is obtained, for example, by mixing an aqueous solution containing tannin 12 with a suspension containing oxide 13. By changing the concentration of each component (more specifically, tannin 12, oxide 13, etc.) in the treatment liquid, the amount of each component attached in the obtained aldehyde removal material can be adjusted.

Then, the substrate 11 is treated with a treatment liquid. Methods for treating the substrate 11 include, for example, a method of immersing the substrate 11 in the treatment liquid and a method of applying the treatment liquid to the surface 11A of the substrate 11.

The treated substrate 11 is then dried. An example of a method for drying the substrate 11 is air-drying the treated substrate 11 in an atmosphere with a temperature of 10°C or higher and 30°C or lower. The drying time for the substrate 11 is preferably 12 hours or higher and 36 hours or lower. In this manner, the aldehyde removal material according to the above-described embodiment is obtained.

The following describes examples of the present invention, but the present invention is not limited to the scope of the examples.

Preparation of Suspension
[Preparation of Suspension S-1]
Iron (II) oxide was added to distilled water as an aqueous medium to obtain suspension S-1 in which iron (II) oxide was suspended (iron (II) oxide concentration: 0.01 g/mL).

[Preparation of Suspensions S-2 to S-8]
Suspensions S-2 to S-8 were each obtained in the same manner as in the preparation of Suspension S-1, except that the material to be suspended (hereinafter referred to as the suspension material) and the aqueous medium were as shown in Table 1. The concentration of the suspension material in each of Suspensions S-2 to S-8 was 0.01 g/mL.

<Preparation of Processing Solution>
[Preparation of Treatment Solution PA-1]
First, condensed tannin ("H-1" manufactured by Iwamoto Kametaro Co., Ltd., mass average molecular weight: 11200) was added to distilled water to obtain a condensed tannin aqueous solution (condensed tannin concentration: 4 mass%). Next, the obtained condensed tannin aqueous solution was mixed with the suspension S-2 obtained by the above-mentioned preparation method to obtain 50 mL of treatment solution PA-1. The amounts of the condensed tannin aqueous solution and the suspension S-2 blended when obtaining treatment solution PA-1 were 49 mL and 1 mL, respectively.

[Preparation of Treatment Solutions PA-2 to PA-8 and PB-1 to PB-6]
Treatment solutions PA-2 to PA-8 and PB-2 to PB-6 were obtained in the same manner as in the preparation of treatment solution PA-1, except that the type of suspension, the blending amount of the suspension, and the blending amount of the condensed tannin aqueous solution were as shown in Table 2. For example, when preparing treatment solution PA-4, the condensed tannin aqueous solution, suspension S-1, suspension S-2, and suspension S-7 were mixed. The blending amounts of the condensed tannin aqueous solution, suspension S-1, suspension S-2, and suspension S-7 in obtaining treatment solution PA-4 were 47 mL, 1 mL, 1 mL, and 1 mL, respectively.

As treatment solution PB-1, 50 mL of a condensed tannin aqueous solution with the same composition as the condensed tannin aqueous solution used to prepare treatment solution PA-1 was prepared. In Table 2, "-" means that no suspension was added.

[Preparation of Treatment Solution PA-9]
First, condensed tannin ("H-1" manufactured by Iwamoto Kametaro Co., Ltd., mass average molecular weight: 11200) was added to distilled water to obtain a condensed tannin aqueous solution (condensed tannin concentration: 4% by mass). Separately, L-proline (manufactured by Sigma-Aldrich) was added to distilled water to obtain an L-proline aqueous solution (L-proline concentration: 0.1 g/mL). Next, the obtained condensed tannin aqueous solution, the obtained L-proline aqueous solution, the suspension S-1 obtained by the above-mentioned preparation method, the suspension S-2 obtained by the above-mentioned preparation method, and the suspension S-4 obtained by the above-mentioned preparation method were mixed to obtain 50 mL of treatment liquid PA-9. The amounts of the condensed tannin aqueous solution, the L-proline aqueous solution, the suspension S-1, the suspension S-2, and the suspension S-4 used to obtain treatment liquid PA-9 were 46 mL, 1 mL, 1 mL, 1 mL, and 1 mL, respectively.

[Preparation of Treatment Solutions PA-10 and PA-11]
Treatment solutions PA-10 and PA-11 were obtained in the same manner as in the preparation of treatment solution PA-9, except that the type of suspension, the amount of suspension, the amount of condensed tannin aqueous solution, and the amount of L-proline aqueous solution were as shown in Table 3.

<Production or preparation of aldehyde removal material>
[Preparation of aldehyde removal material RA-1]
First, 50 mL of the treatment liquid PA-1 (treatment liquid PA-1 obtained by the above-mentioned preparation method) was placed in a beaker, and then one paper cloth ("Kimwipe (registered trademark)" manufactured by Nippon Paper Crecia Co., Ltd., size 12.0 cm x 21.5 cm) was immersed in the treatment liquid PA-1 in the beaker. Next, the immersed paper cloth was removed from the beaker and air-dried for 24 hours in an atmosphere at a temperature of 25 ° C. As a result, an aldehyde removing material RA-1 was obtained, which contains a paper cloth as a substrate and condensed tannin and iron (III) oxide attached to the surface of the paper cloth. The obtained aldehyde removing material RA-1 was observed with an electron microscope, and it was confirmed that the condensed tannin and iron (III) oxide were attached to the surface of the paper cloth in a state of close contact with each other. In addition, in the aldehyde removing material RA-1, the above-mentioned aspects shown in Figures 1 to 3 were mixed. Furthermore, in the obtained aldehyde remover RA-1, the amount of condensed tannin and the amount of iron (III) oxide were 155 μg and 7.8 ng, respectively, per 1 cm ² of the surface of the paper cloth.

[Preparation of aldehyde removal materials RA-2 to RA-11 and RB-1 to RB-6]
Aldehyde removing materials RA-2 to RA-11 and RB-1 to RB-6 were obtained in the same manner as in the preparation of the aldehyde removing material RA-1, except that the types of treatment liquids were as shown in Table 4 below.

In the obtained aldehyde removal materials RA-2 to RA-11 and RB-1 to RB-6, the amount of condensed tannin per ¹ cm2 of the surface of the paper waste was in the range of 155 μg to 310 μg. In addition, in the obtained aldehyde removal materials RA-2 to RA-11 and RB-2 to RB-6, the amount of oxide per ¹ cm2 of the surface of the paper waste (when multiple types of oxides were used, the total amount of them) was in the range of 7.8 ng to 46.8 ng. In addition, in the obtained aldehyde removal materials RA-9 to RA-11, the amount of L-proline per ¹ cm2 of the surface of the paper waste was in the range of 78.0 ng to 156.0 ng.

[Preparation of aldehyde remover RB-7]
As the aldehyde removal material RB-7 (reference example), an untreated paper cloth ("Kimwipe (registered trademark)" manufactured by Nippon Paper Crecia Co., Ltd., size 12.0 cm x 21.5 cm) was prepared.

<Evaluation of aldehyde removal performance>
An aldehyde remover to be evaluated (aldehyde remover RA-1 to RA-11 and RB-1 to RB-7) was placed in a 1 L Tedlar (registered trademark) bag, and then 300 mL of mixed gas was placed and the Tedlar bag was sealed. The mixed gas placed in the Tedlar bag was a gas in which acetaldehyde gas was mixed at a ratio of 10 ppm by volume in air with a nitrogen to oxygen volume ratio (nitrogen:oxygen) of 4:1. The sealed Tedlar bag was then kept warm for 24 hours in an atmosphere at a temperature of 25°C. At this time, 1 mL of the gas in the Tedlar bag was sampled at each of the following times: immediately after the start of the Tedlar bag warming, 3 hours after the start of the Tedlar bag warming, and immediately after the end of the Tedlar bag warming (24 hours after the start of the warming). The concentration of acetaldehyde gas in the sampled gas was then measured using a sensor gas chromatograph ("SGEA-P3-C2" manufactured by Nissha FIS, Inc.). Hereinafter, the concentration of acetaldehyde gas measured immediately after the start of incubation is described as concentration _0. The concentration of acetaldehyde gas measured 3 hours after the start of incubation is described as concentration _3. The concentration of acetaldehyde gas measured 24 hours after the start of incubation is described as concentration ₂₄ .

From the obtained concentrations ₀ and ₃ , the decay rate (unit: %) of acetaldehyde gas 3 hours after the start of insulation was calculated using the calculation formula shown in formula (A) below. Also, from the obtained concentrations ₀ and ₂₄ , the decay rate (unit: %) of acetaldehyde gas 24 hours after the start of insulation was calculated using the calculation formula shown in formula (B) below. Hereinafter, the decay rate of acetaldehyde gas 3 hours after the start of insulation may be referred to as decay rate _3. Also, the decay rate of acetaldehyde gas 24 hours after the start of insulation may be referred to as decay rate ₂₄ .
Decay rate of acetaldehyde gas 3 hours after the start of warming (decay rate ₃ ) = 100 x concentration ₃ / concentration ₀ ... (A)
Decay rate of acetaldehyde gas 24 hours after the start of warming (decay rate ₂₄ ) = 100 x concentration ₂₄ / concentration ₀ ... (B)

The attenuation rate ₃ and attenuation rate ₂₄ of each aldehyde removal material are shown in Table 4. When the attenuation rate ₂₄ was 12.00% or less, it was evaluated as "aldehyde is efficiently removed." On the other hand, when the attenuation rate ₂₄ was more than 12.00%, it was evaluated as "aldehyde is not efficiently removed."

The aldehyde removers RA-1 to RA-11 contained a substrate (paper cloth) and tannin and oxides attached to the substrate surface. In the aldehyde removers RA-1 to RA-11, the oxides attached to the substrate surface contained at least one selected from the group consisting of alumina, silica, and iron(III) oxide.

As shown in Table 4, the attenuation rate ₂₄ of the aldehyde removers RA-1 to RA-11 was 12.00% or less. Therefore, the aldehyde removers RA-1 to RA-11 were able to efficiently remove aldehyde.

Aldehyde removers RB-1 to RB-7 did not contain at least one oxide selected from the group consisting of alumina, silica, and iron(III) oxide.

As shown in Table 4, the attenuation rate ₂₄ of the aldehyde removers RB-1 to RB-7 exceeded 12.00%. Therefore, the aldehyde removers RB-1 to RB-7 were unable to efficiently remove aldehyde.

These results show that the aldehyde remover of the present invention can efficiently remove aldehyde.

The aldehyde remover of the present invention can be used, for example, as a material for removing aldehydes from the living environment.

10, 20, 30, 40 Aldehyde remover 11 Substrate 11A Surface of substrate 12 Tannin 13 Oxide 14 L-proline

Claims (8)

A substrate;
tannins and oxides attached to a surface of the substrate;
The oxide comprises iron (III) oxide , The aldehyde removing material according to claim 1 , wherein the oxide comprises alumina . The aldehyde removing material according to claim 2 , wherein the oxide further comprises iron (II) oxide. The aldehyde removing material according to claim 2 , wherein the oxide further comprises silica . A substrate;
tannins and oxides attached to the surface of the substrate;
L-proline attached to the surface of the substrate ;
Including ,
The aldehyde remover includes at least one oxide selected from the group consisting of alumina and silica , iron (III) oxide , and iron (II) oxide. 6. The aldehyde removal material according to claim 5 , wherein the amount of L-proline is 50.0 ng or more and 200.0 ng or less per ^{1 cm2} of the surface of the substrate. The aldehyde remover according to any one of claims 1 to 6 , wherein the amount of the tannin is 100 µg or more and 500 µg or less per 1 cm ² of the surface of the substrate. The aldehyde remover according to any one of claims 1 to 7 , wherein the amount of the oxide is 7.5 ng or more and 50.0 ng or less per ^{1 cm2} of the surface of the substrate.

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