JP2008208475A - Three-dimensional structure material attached with rice chaff ash and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a three-dimensional structure material suitable as a filter material capable of holding a large amount of a functional material especially for deodorizing, odor eliminating or air cleaning use, etc., and having low pressure loss, excellent processing capacity and flexibility. <P>SOLUTION: This structure is achieved by the finding that a filter having unprecedented processing capacity and high flexibility can be produced by attaching rice chaff ash to the surface of a constitution fiber of a three-dimensional knit structure having interconnected holes and immobilizing a large amount of a functional material in the fine pores of the rice chaff ash. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a filter of a three-dimensional structure having a three-dimensional flow path, in which rice husk ash is attached to the constituent fiber surface of a knitted fabric having a three-dimensional structure, and in particular, functional materials such as deodorization, deodorization, air purification, etc. It is a technique relating to a three-dimensional structure that can be suitably used as a filter material that can carry a large amount of water and that can exhibit various performances efficiently with low pressure loss.

  Conventionally, as a structure suitably used as a filter material, a filter having a honeycomb structure or a filter having a structure in which fibers are entangled in a random direction, such as a nonwoven fabric, is often used. All of them have a continuous porous structure, have a large contact area with gas and the like, and can be said to be effective filter materials.

  However, in the filter of the honeycomb structure, since the flow of gas or the like is only in one direction along the axial direction of the through hole, the flow rate is high near the center of the hole, and the flow rate is low near the side wall of the hole, There is a problem in that unevenness occurs in contact between the gas or the like and various functional materials carried on the filter material, and reduction in contact efficiency is unavoidable.

  Further, in the case of a nonwoven fabric, there is a problem that if the reaction time with various functional materials carried on the filter material is increased, a thick filter is formed and the pressure loss increases.

  As an alternative to the above method, the applicant described in Patent Document 1 is a ceramic three-dimensional solid body obtained by firing a structure in which ceramics are attached to a three-dimensional solid structure knitted fabric and removing organic components from the three-dimensional solid knitted fabric. A structure is proposed. In this method, a turbulent flow is easily generated in the fluid passing through the three-dimensional structure, and the filter material having excellent contact efficiency between the ceramic and the fluid and having a small pressure loss can be obtained. However, although the ceramic three-dimensional structure is an excellent filter material, it is brittle. Therefore, it has been desired that the ceramic three-dimensional structure has strength and flexibility because it is crushed during use or cracked during transportation. In addition, since a large amount of functional material cannot be supported on the surface of the ceramic, a sufficient effect cannot be obtained unless the flow path has a long structure.

JP2000-154070

  The problem of the present invention is that it can be suitably used as a filter material that can carry a large amount of functional materials such as deodorizing, deodorizing, air purification, etc., and has low pressure loss, excellent processing capability, and flexibility. It is to provide a rich three-dimensional structure.

  In the present invention, rice husk ash is adhered to the surface of a constituent fiber of a three-dimensional structure knitted fabric having continuous pores, and a large amount of functional material is fixed in the pores of the rice husk ash, so that The present inventors have found that a filter having no processing ability can be obtained, and have reached the present invention. In order to achieve the above object, the present invention provides the following means.

  [1] A three-dimensional structure characterized in that rice husk ash is adhered to the surface of a constituent fiber of a knitted fabric having a three-dimensional structure having continuous holes.

  [2] The knitted fabric having a three-dimensional structure is knitted so that a connecting yarn hangs between a knitted fabric structure having a plurality of upper and lower two-layer openings arranged at predetermined intervals. The three-dimensional structure according to item 1 above.

  [3] The three-dimensional structure according to the above item 1 or 2, wherein a functional material such as a catalyst or an adsorbent is supported on rice husk ash adhering to the surface of the constituent fiber of the three-dimensional structure knitted fabric having continuous pores.

  [4] A method for producing a three-dimensional structure, comprising immersing a knitted fabric having a three-dimensional structure having continuous pores in a binder resin solution, and then attaching and drying rice husk ash.

  [5] A three-dimensional structure characterized in that a three-dimensional structure knitted fabric having continuous pores is immersed in a binder resin solution, and then rice husk ash carrying a functional material such as a catalyst and an adsorbent is attached and dried. Manufacturing method.

  [6] The knitted fabric having a three-dimensional structure is knitted in such a manner that a connecting yarn hangs between knitted fabric structures having a plurality of upper and lower two-layer openings arranged at predetermined intervals. 6. The method for producing a three-dimensional structure according to item 4 or 5.

  [7] The method for producing a three-dimensional structure according to item 6, wherein a monofilament yarn of 100 to 2000 decitex is used for at least a part of the connecting yarn.

  [8] The three-dimensional structure according to item 7 above, wherein a combination yarn of one or two yarns selected from the group consisting of a spun yarn and a multifilament yarn and a monofilament yarn of 100 to 2000 dtex is used as the connecting yarn. Body manufacturing method.

  [9] The tertiary according to item 7 or 8 above, wherein one or two kinds of yarns selected from the group consisting of spun yarns and multifilament yarns are used as at least a part of the yarns constituting the upper and lower two-layer knitted fabric structure. Method for manufacturing original structure

  According to the invention of [1], since it is a knitted fabric having a three-dimensional structure having continuous holes, the size of the opening of the knitted fabric, the density of the three-dimensional structure, and the like can be strictly controlled. A three-dimensional structure can be formed. Further, since the three-dimensional structure is formed with a three-dimensional flow path, a turbulent flow is generated and the contact efficiency with the fluid is excellent. In addition, since it is a three-dimensional structure in which rice husk ash is adhered to the surface of the constituent fibers of the knitted fabric, a large amount of functional materials such as catalysts and adsorbents are supported in the continuous pores of rice husk ash. It is possible to create a highly flexible three-dimensional structure. In addition, when a photocatalyst is carried as a functional material, light can be irradiated deeply into the knitted fabric having a three-dimensional structure, so that the effect of photocatalytic activity can be exhibited. Since rice husk ash is attached to the surface of the constituent fiber of the knitted fabric, the photocatalyst is not in direct contact with the fiber or the binder resin, so that the surface of the fiber or the binder resin can be prevented from being destroyed by the photocatalyst. .

  According to the invention of [2], the knitted fabric having the three-dimensional structure is knitted so that the connecting yarn hangs between the knitted fabric structures having a plurality of upper and lower two layers of openings arranged at a predetermined interval. Since it is attached, it is possible to obtain a three-dimensional structure in which the interval between the knitted fabric structures having a plurality of upper and lower two-layer openings is accurately maintained and the flow path is secured.

  According to the invention of [3], a large amount of functional materials such as catalysts and adsorbents are carried on the rice husk ash adhering to the surface of the constituent fibers of the three-dimensional structure knitted fabric having continuous pores. The contact with the fluid is made efficiently, and a three-dimensional structure having a large processing capability can be obtained.

  According to the invention of [4], the surface of the rice husk ash is covered with the binder resin by immersing the knitted fabric having a three-dimensional structure having continuous pores in the binder resin solution, and then attaching and drying the rice husk ash. And a method for producing a three-dimensional structure that can be attached to the fiber surface of a knitted fabric having a three-dimensional structure.

  According to the invention of [5], after immersing a knitted fabric having a three-dimensional structure having continuous pores in a binder resin solution, by attaching and drying rice husk ash carrying a functional material such as a catalyst and an adsorbent, It can be set as the manufacturing method of the three-dimensional structure which can be made to adhere to the fiber surface of the knitted fabric of a three-dimensional structure, without covering the surface of functional materials, such as a catalyst and adsorbent, with binder resin.

  According to the invention of [6], the knitted fabric having the three-dimensional structure is knitted in such a manner that the connecting yarn hangs between the knitted fabric structures having a plurality of upper and lower two layers of openings arranged at a predetermined interval. Therefore, a method for producing a three-dimensional structure in which the interval between the knitted fabric structures having a plurality of upper and lower two-layer openings is accurately maintained and the flow path is secured can be obtained.

  According to the invention of [7], since a monofilament yarn of 100 to 2000 dtex is used for at least a part of the connecting yarn, the distance between the upper and lower two layers of the knitted fabric structure is accurately maintained and sufficient mechanical strength is ensured. For example, it can be set as the manufacturing method of a three-dimensional structure suitable when deforming like a cylindrical shape.

  According to the invention of [8], as the connecting yarn, a combination yarn of one or two yarns selected from the group consisting of a spun yarn and a multifilament yarn and a monofilament yarn of 100 to 2000 dtex is used. Adhesiveness of the binder resin solution to the connecting yarn can be further improved, and a method for producing a three-dimensional structure can be obtained in which a functional material such as a catalyst and an adsorbent can be stably supported.

  According to the invention of [9], since at least a part of the yarns constituting the upper and lower two-layer knitted fabric structure uses one or two types of yarns selected from the group consisting of spun yarns and multifilament yarns, Adhesiveness of the binder resin solution to the knitted fabric structure can be further improved, and a method for producing a three-dimensional structure can be obtained in which a functional material such as a catalyst and an adsorbent can be stably carried.

  The present invention attaches rice husk ash as a carrier to the surface of a constituent fiber of a three-dimensional structure knitted fabric having continuous pores as shown in FIG. 1, and a large amount of functional material is contained in the pores of the rice husk ash. By carrying it on the filter, it is possible to obtain a filter having unprecedented processing capability and high flexibility.

Rice husks obtained by rice threshing, etc. are discharged in large quantities every year as agricultural waste, and some of them are used as fuel, but most of them are discarded without being effectively used or incinerated. The volume is reduced and discarded as rice husk ash. The present inventors noticed that most rice husk ash is occupied by silicic acid (SiO ₂ ), and the surface is composed of fine through-holes. We thought that unprecedented processing capacity could be obtained by loading a large amount of functional materials.

  Any rice husk ash can be used as long as it is obtained by burning rice husk obtained by rice threshing. In general, when the combustion temperature is low, the color of ash is black. When the combustion temperature is about 500 ° C., the ash is non-changing silica, and when the combustion temperature is about 1000 ° C., crystallization progresses and becomes white. As described above, the color tone and type of crystals of rice husk ash vary depending on the atmosphere during combustion, the combustion temperature, and the combustion time, and any of these can be used in the present invention.

  The grain size of rice husk ash is preferably 0.5 to 50 μm. A particle size of less than 0.5 μm is not preferable because a large amount of functional materials such as a catalyst and an adsorbent cannot be supported on rice husk ash. A particle size exceeding 50 μm is not preferable because it tends to fall off the fiber surface. A more preferable particle size is 1 to 10 μm.

  The knitted fabric having a three-dimensional structure is preferably formed by knitting a knitted fabric structure having a plurality of upper and lower two-layer openings arranged at a predetermined interval so as to hang a connecting yarn. . Since such a knitted fabric can be manufactured by, for example, a double Russell knitting machine or the like, it is possible to obtain a flexible three-dimensional structure that is strictly controlled in structure.

  For example, in a knitted fabric having a structure as shown in FIG. 1, a large number of connecting yarns 4 are arranged between an upper layer body 2 and a lower layer body 3 having a plurality of openings arranged at predetermined intervals, and both ends thereof are arranged. The upper layer body 2 and the lower layer body 3 are joined to each other. The upper layer body 2 has a large number of openings 2a, and the lower layer body 3 also has a large number of openings 3a. The original structure 1 as a whole has continuous holes. That is, a three-dimensional flow path is formed as a whole.

  Furthermore, the form of the knitted fabric structure is not particularly limited as long as the knitted fabric has a plurality of openings, and examples thereof include a turtle shell knitted fabric, a marquette knitted fabric, and a mesh knitted fabric. In the present embodiment, a turtle shell knitted fabric form is adopted.

  The upper knitted fabric structure and the lower knitted fabric structure may have the same structure, size of openings, etc., but from the viewpoint of further improving the contact efficiency with fluid, the upper layer structure and the lower layer structure Therefore, it is desirable that at least one of the tissue form and the size of the opening is different. With such a configuration, turbulent flow is more likely to occur inside the obtained three-dimensional structure, and as a result, contact efficiency with the fluid passing through the continuous holes of the three-dimensional structure can be further improved. It is.

On the other hand, the arrangement form of the connecting yarn between the upper and lower tissues is not particularly limited, and for example, the arrangement interval of the connecting yarn may be set appropriately. In addition, the connecting yarn may be arranged in a mode in which it is hung in the vertical direction with respect to the upper and lower two layers of the knitted fabric structure in a cross-sectional view of the knitted fabric, or in an oblique arrangement, a cross arrangement, a zigzag arrangement Any of a rhombus-shaped arrangement, a honeycomb-shaped arrangement, etc. may be used. Of course, the arrangement configuration which combined these arbitrarily may be sufficient. Moreover, it can also be set as the structure which made the arrangement | sequence of a connection thread | miss partly missing in a tooth-missing shape.

  The material constituting the knitted fabric structure and the connecting yarn is not particularly limited, and examples thereof include synthetic fibers such as polyester, polyamide and polyacrylonitrile, regenerated fibers, and natural fibers such as wool and silk. Any of the above materials may be used alone, or some of them may be used in combination, but it is preferable to use a monofilament yarn of 100 to 2000 dtex for at least a part of the connecting yarn. By using a monofilament yarn of 100 to 2000 dtex, the distance between the upper and lower knitted fabric structures can be accurately maintained, and sufficient mechanical strength can be ensured. A monofilament yarn having a thickness of less than 100 dtex cannot ensure sufficient mechanical strength, and a monofilament yarn having a thickness exceeding 2000 dtex cannot be knitted. It is preferable to use a monofilament yarn of 200 to 800 dtex.

  However, since the surface of the monofilament yarn is smooth, when the knitted fabric having the three-dimensional structure is immersed in the binder resin solution, the adhesive strength of the binder resin may be weak, so that the adhesive strength of the binder resin is compensated. In addition, as the connecting yarn, a combination yarn of one or two types selected from the group consisting of a spun yarn and a multifilament yarn and a monofilament yarn of 100 to 2000 dtex is used, or a spun yarn and a multifilament It is preferable to use one or two kinds of yarns selected from the group consisting of yarns and 100 to 2000 decitex monofilament yarns separately as constituent yarns of the connecting yarns without forming a combined yarn form. The form of the former combination yarn is not particularly limited, but a twisted yarn, a draw yarn, and a wrap yarn are preferably used. Among these, a twist yarn, a draw yarn, and a wrap yarn each having a fineness of 20 dtex or less are used. Yarns are even more preferred. Further, as a specific example of the latter, for example, a configuration in which a yarn (spun yarn and / or multifilament yarn) to be used in combination and a monofilament yarn are arranged at an arbitrary interval may be mentioned. In both the former and the latter cases, the mechanical strength between the upper and lower two layers can be maintained by the monofilament yarn, and the adhesion of the binder resin solution to the connecting yarn is further enhanced by the capillary phenomenon of the spun yarn and / or the multifilament yarn. Can be improved.

  In addition, when the knitted fabric having the above three-dimensional structure is immersed in a binder resin solution, generally, the knitted fabric is often left with oil or the like on the surface, and if the immersion treatment is performed in this state, the binder resin adheres. Therefore, it is desirable to remove oil and the like by dipping in a degreasing solution before the dipping treatment. Such a degreasing solution is not particularly limited as long as it can dissolve and remove oil and the like. For example, silicates, carbonates, sequestering agents (for example, ethylenediaminetetraacetic acid (EDTA), etc.) Examples thereof include a phosphorus-free medium temperature alkaline degreasing agent as a main component.

  Next, after immersing the knitted fabric having a three-dimensional structure having continuous pores in the binder resin solution, rice husk ash is adhered and dried. To attach rice husk ash to a three-dimensional knitted fabric, place a three-dimensional knitted fabric with a binder resin solution in the rice husk ash bath, and move the rice husk ash up and down, left and right, and then dry it. For example, rice husk ash can be adhered to the surface of the constituent fibers of the knitted fabric having a three-dimensional structure.

  Furthermore, if it is immersed in an aqueous solution of a functional material such as a catalyst or an adsorbent and dried, the functional material is supported in large quantities in the continuous pores of rice husk ash, and a carrier that exhibits excellent functionality can be produced. it can. In addition, if a functional material such as a catalyst or an adsorbent is previously supported in the continuous pores of rice husk ash, and adhered to a three-dimensional knitted fabric with a binder resin solution and dried, the same excellent A carrier exhibiting functionality can be manufactured.

  The catalyst is not particularly limited, and examples thereof include metal oxides such as alumina, titanium oxide, zinc oxide, and iron oxide, phthalocyanine, and the like, but are not particularly limited to these exemplified compounds.

  Examples of the adsorbent include, but are not limited to, porous inorganic substances such as activated carbon, porous silica and zeolite, polyamine compounds such as diethylenetriamine and tetraethylenepentamine, adipic acid hydrazide, sebacic acid dihydrazide, dodecanoic acid dihydrazide, and isophthalic acid. And hydrazine derivatives such as dihydrazide.

  Next, the deodorizing filter of the present invention will be described specifically by way of examples. In addition, the deodorizing test in an Example and a comparative example was done as follows.

  In the center of a 50 cm square acrylic box, a fan and a cylindrical filter were set in a cylindrical filter case, and the following deodorizing tests for various gases were conducted. Deodorization test methods for various gases are shown below, and the evaluation results are shown in Table 1.

(Ammonia deodorization performance)
Ammonia gas was injected so that the concentration became 200 ppm in a 50 cm square acrylic box, and after 30 minutes, the residual concentration of ammonia gas was measured, and the total amount from which ammonia gas was removed was calculated from this measured value. The gas removal rate (%) was calculated.

(Hydrogen sulfide deodorization performance)
The removal rate (%) of hydrogen sulfide was calculated in the same manner as the ammonia deodorization performance measurement except that hydrogen sulfide gas was injected instead of ammonia gas and the concentration was 20 ppm.

(Acetaldehyde deodorization performance)
Acetaldehyde gas was removed in the same manner as the ammonia deodorization performance measurement, except that acetaldehyde gas was injected instead of ammonia gas, the concentration was 80 ppm, and the remaining concentration of formaldehyde gas was measured after 4 hours. The rate (%) was calculated.

  And, “◎” when the removal rate is 95% or more, “◯” when the removal rate is 80% or more and less than 95%, “△” when the removal rate is 70% or more and less than 80%, Those having a removal rate of less than 70% were evaluated as “x”, and the results shown in Table 1 were obtained.

<Example 1>
Using a double raschel knitting machine (9 gauge / inch), a twisted yarn of 600 dtex polyester monofilament yarn and 1300 dtex 96 filament polyester filament yarn is used as the connecting yarn, and 1300 dtex 96 is used as the constituent yarn of the knitted fabric structure. A knitted fabric (thickness 12 mm) having a three-dimensional structure having continuous holes configured as shown in FIG. 1 was knitted using twisted yarns of polyester filament yarn. The knitted fabric structure of the upper and lower layers of this knitted fabric was a turtle shell knitted fabric structure. Next, the knitted fabric was cut into a size of 40 cm × 15 cm from the knitted fabric to prepare a sample. Next, this sample was immersed in a 5% acrylic resin emulsion solution, and subsequently placed in a bath of rice husk ash (average particle size 10 μm). After sufficient rice husk ash was adhered, it was dried in an oven (at 130 ° C., 10 ° C. After fixing for 300 minutes, 300 mg of adipic hydrazide and 300 mg of diethylenetriamine were added to 300 cc of water and immersed in a sufficiently dissolved solution, and dried again to obtain a deodorizing filter. The amount of rice husk ash carried on the sample was 3 g, and the amount of adipic acid hydrazide and diethylenetriamine carried was 0.5 g. Next, as shown in FIG. 2, this sample was spirally wound into a cylindrical filter case to obtain a cylindrical filter. Table 1 shows the results of the deodorization test of the cylindrical filter.

<Example 2>
In Example 1, 300 mg of adipic acid hydrazide and 300 mg of diethylenetriamine were added to 300 cc of water and dissolved with sufficient stirring. Then, 10 g of rice husk ash (average particle size: 10 μm) was added, sufficiently impregnated and dried. After preparing rice husk ash in which 6% by weight of adipic acid hydrazide and diethylenetriamine are supported in the continuous pores of rice husk ash, a three-dimensional knitted fabric having continuous pores is immersed in a 5% acrylic resin emulsion solution. Immediately after putting in the rice husk ash bath, confirm that the rice husk ash was sufficiently adhered, and drying in an oven (130 ° C., 10 minutes) to obtain a filter. I did it. The amount of rice husk ash supported on the three-dimensional structure knitted fabric was 9 g, and the amount of adipic acid hydrazide and diethylenetriamine supported on the three-dimensional structured knitted fabric was 0.5 g.

<Example 3>
In Example 1, rice husk ash was attached to a knitted sample having a three-dimensional structure having continuous pores, and then dipped in a 5% acrylic resin emulsion solution again and placed in a coconut shell activated carbon bath. Then, drying was performed in an oven (130 ° C., 10 minutes), and the same procedure as in Example 1 was performed except that 0.5 g of coconut shell activated carbon was adhered.

<Example 4>
In Example 3, a filter was prepared as titanium oxide (catalyst) instead of coconut shell activated carbon, and the same procedure as in Example 3 was performed except that 1 mW UV irradiation was set in a 50 cm square acrylic box. It was. The amount of titanium oxide (catalyst) supported was 0.5 g.

<Example 5>
In Example 3, in place of the coconut shell activated carbon, it was carried out in the same manner as in Example 3 except that the coconut shell activated carbon and titanium oxide (catalyst) were mixed in an equal amount of bath and a filter was prepared. The supported amount of coconut shell activated carbon was 0.25 g, and the supported amount of titanium oxide (catalyst) was 0.25 g.

<Example 6>
Example 1 was the same as Example 1 except that the connecting yarn was replaced with a 600 decitex polyester monofilament yarn and a 1300 decitex 96 filament polyester filament yarn instead of a 600 decitex polyester monofilament yarn. It was done. The amount of rice husk ash supported on the knitted sample of the three-dimensional structure was 2 g, and the amount of the adipic acid hydrazide and diethylenetriamine supported on the knitted sample of the three-dimensional structure was 0.3 g.

<Reference Example 1>
In Example 2, instead of a knitted fabric having a three-dimensional structure having continuous pores, a honeycomb filter made of pulp (thickness 12 mm) was used, and the rice husk ash desired to carry 6% by weight of adipic acid hydrazide and diethylenetriamine was added to the honeycomb filter. This was carried out in the same manner as in Example 2, except that the honeycomb filter having the same volume as in Example 2 was housed in a cylindrical filter case. The amount of rice husk ash carried on the honeycomb filter was 6 g, and the amount of adipic acid hydrazide and diethylenetriamine carried on the honeycomb filter was 10 g. Had to be cut.

<Comparative Example 1>
In Example 1, a three-dimensional structure knitted fabric having continuous pores was immersed in a 5% acrylic resin emulsion solution, and then directly supported by powders of adipic acid hydrazide and diethylenetriamine. It was done. The amount of adipic acid hydrazide and diethylenetriamine supported on the sample was 10 g.

<Comparative example 2>
In Example 1, a knitted sample having a three-dimensional structure having continuous pores was immersed in a 5% acrylic resin emulsion solution, and then immediately supported with titanium oxide (catalyst) powder, and 1 mW in a 50 cm square acrylic box. The same procedure as in Example 1 was conducted except that the ultraviolet rays were set to be irradiated. The amount of titanium oxide (catalyst) supported on the sample was 12 g.

  As can be seen from Table 1, with respect to Examples 1 to 6 of the present invention, air circulation was good and various malodorous gases could be removed in a short time. In Comparative Examples 1 and 2 in which ash was not attached, the deodorizing performance was not satisfactory. In Comparative Example 2, the acrylic resin became brittle due to the photocatalytic activity of titanium oxide, and the titanium oxide was dropped.

  The technology of the present invention is a technology for purifying various gases by using a three-dimensional flow path of a three-dimensional structure knitted fabric having continuous pores and continuous fine pores of rice husk ash, and can carry a large amount of functional materials. Since it can be cut and bent according to the shape of the filter case, it can be cut and bent according to the shape of the filter case, so that it can be used not only in indoor spaces but also in cars, railways, and other forms of filters such as humid refrigerators. Widely used. In addition, a three-dimensional knitted fabric having continuous pores can be used as a support for a photocatalyst or the like because light passes through the structure.

It is a principal part perspective view which shows the knitted fabric of the three-dimensional solid structure which has a continuous hole. Cylindrical cylindrical filter

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Knitted fabric of three-dimensional structure which has continuous hole 2 Upper layer body 2a Upper layer body opening part 3 Lower layer body 3a Lower layer body opening part 4 Connecting thread

Claims (9)

A three-dimensional structure characterized in that rice husk ash is adhered to the surface of a constituent fiber of a three-dimensional structure knitted fabric having continuous holes. The knitted fabric having a three-dimensional structure is knitted in such a manner that a connecting yarn hangs between a knitted fabric structure having a plurality of upper and lower two-layer openings arranged at a predetermined interval. The three-dimensional structure described in 1. The three-dimensional structure according to claim 1 or 2, wherein functional materials such as a catalyst and an adsorbent are supported on rice husk ash adhering to the surface of the constituent fibers of the three-dimensional structure knitted fabric having the continuous holes. A method for producing a three-dimensional structure, comprising immersing a knitted fabric having a three-dimensional structure having continuous pores in a binder resin solution, and attaching and drying rice husk ash. A method for producing a three-dimensional structure, comprising: dipping a knitted fabric having a three-dimensional structure having continuous pores in a binder resin solution; and attaching and drying rice husk ash carrying a functional material such as a catalyst and an adsorbent. . 5. The knitted fabric having a three-dimensional structure is knitted so that a connecting yarn hangs between a knitted fabric structure having a plurality of upper and lower two-layer openings arranged at a predetermined interval. Or the manufacturing method of the three-dimensional structure of 5. The method for producing a three-dimensional structure according to claim 6, wherein a monofilament yarn of 100 to 2000 dtex is used for at least a part of the connecting yarn. The three-dimensional structure according to claim 7, wherein a combination yarn of one or two types selected from the group consisting of a spun yarn and a multifilament yarn and a monofilament yarn of 100 to 2000 dtex is used as the connecting yarn. Production method. The three-dimensional structure according to claim 7 or 8, wherein one or two kinds of yarns selected from the group consisting of a spun yarn and a multifilament yarn are used as at least a part of the yarns constituting the upper and lower two-layer knitted fabric structure. Body manufacturing method.