JPH05811A - Activated carbon material, its production and use thereof - Google Patents

Abstract

PURPOSE:To provide an activated carbon material with high activity which is useful as a hydrogen peroxide decomposition catalyst or a hydrazine decomposition catalyst and its production method. CONSTITUTION:Protein or protein containing sludge or waste is subjected to carbonization and reactivation treatment to form an activated carbon material. The material has a content of 1 to 5wt.% nitrogen, 3 to 30wt.% oxygen and 40 to 90wt.% carbon, and has 15 to 300Angstrom average pore radius, and consists of vesicular mesopores occupying at least 50vol.% of the whole volume.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to activated carbon effective for decomposing various compounds contained in waste liquid generated from a chemical plant, waste liquid waste generated during semiconductor treatment, waste liquid generated during metal surface treatment, and the like. It is useful as a decomposition catalyst for hydrogen peroxide or hydrazine contained in waste water and waste liquid, for example, as a raw material.

[0002]

2. Description of the Related Art Hydrogen peroxide is currently industrially produced in large quantities and has a wide range of uses.
It is widely used as a bleaching agent and oxidizing agent for fibers; a bactericidal agent and an oxidizing agent as pharmaceuticals; a bleaching agent and a bactericidal agent for foods; a surface treatment agent for metals; and a cleaning agent for semiconductors. However,
If the waste liquid containing hydrogen peroxide is discharged as it is, COD
Not only as a source, but also when treating wastewater, for example, when mixed with a biological activated sludge treatment device, oxygen gas generated by decomposition of hydrogen peroxide floats the suspension in the settling tank, and It causes various troubles such as deterioration. Therefore, hydrogen peroxide in waste water is usually decomposed in advance and discharged.

As a conventional method for decomposing hydrogen peroxide, (1) a decomposing method using a chemical such as sodium bisulfite, (2) a decomposing method using manganese dioxide as a catalyst, and (3) using activated carbon And (4) decomposition methods using enzymes such as catalase. However, the above method (1) generates sulfurous acid gas at the time of decomposition, which leads to deterioration of the surrounding environment, and it requires the use of more than the equivalent of hydrogen peroxide, which requires the use of a large amount of chemicals and costs. In addition, there is a problem that excess sodium bisulfite causes secondary pollution as a COD source. In the method (2), manganese is eluted at the time of decomposition, and particularly under acidic conditions, manganese elutes violently, and there is a disadvantage that manganese is contaminated. The method (3) generally has a disadvantage that the decomposition ability is small and the life is short. Further, the method (4) has the drawback that the pH range of the liquid used is limited to neutral or room temperature because catalase is an enzyme. As described above, each of the conventional methods has many problems, and a fundamental improvement is desired.

In addition, hydrazine or its salts and hydrazine derivatives (hereinafter referred to as hydrazines) are widely used at present as boiler agents, reducing agents, agricultural chemicals, polymerization catalysts, foaming agents, semiconductor treating agents, water treating agents and the like. Therefore, when treating the waste liquid containing the hydrazines and the waste water, the hydrazine contained is decomposed in advance. Conventionally, the decomposition treatment of hydrazines has generally employed a method of adding sodium hypochlorite to waste liquid and drainage containing hydrazine to oxidize and decompose hydrazine. The oxidative decomposition of hydrazine by sodium hypochlorite is calculated by the following equation. N ₂ H ₄ + 4NaOCl → 4NaCl + 2H ₂ O ₂ + N ₂ + O ₂ In the case of this reaction, a large amount of sodium hypochlorite is used, so the cost required for the treatment becomes enormous and expensive. There is also a problem that some chlorine may remain in the waste liquid after decomposition. On the other hand, JP-A-53-91093
JP-A-53-91095 discloses a method of decomposing hydrazine with air using a heavy metal as a catalyst. The decomposition of hydrazine by this air is based on the following equation. N ₂ H ₄ + O ₂ → N ₂ + 2H ₂ O However, this method has drawbacks such as a slow decomposition rate and insufficient decomposition of hydrazine, and there is a risk of secondary contamination with heavy metals. It's not a good method.

As described above, each of the conventional methods for decomposing hydrogen peroxide or hydrazine has various problems. INDUSTRIAL APPLICABILITY The present invention solves the above-mentioned various problems, can be used in a wide range of liquid properties (pH range), and has highly active hydrogen peroxide decomposing ability or hydrazine decomposing ability, and further, generation of secondary pollution. Without
The present invention provides a catalyst for decomposing hydrogen peroxide and hydrazine, which is composed of an activated carbon material that can be decomposed.

[0005]

[Means for Solving the Problems]
Or carbonization treatment of sludge or waste material containing protein, activated carbon material obtained by activation treatment, is highly active as a decomposition catalyst of hydrogen peroxide or hydrazine, and is safe without the occurrence of secondary pollution, It has been found to be extremely effective. After further study, after the above carbonization and activation treatment, activated carbon material obtained by acid treatment and heat treatment and activated carbon material obtained by heat treatment of polyacrylonitrile-based activated carbon fiber also show high activity. It has been found to be extremely effective as a decomposition catalyst for hydrogen peroxide or hydrazine. That is, the present invention contains 1 to 5% by weight of nitrogen, 3 to 30% by weight of oxygen, and 40 to 90% by weight of carbon, respectively, and has an average pore radius of 15 to 30Å.
The present invention relates to an activated carbon material characterized by containing at least 50% by volume of porous mesopores, a method for producing the same, and a catalyst for decomposing hydrogen peroxide or hydrazine.

The activated carbon material in the present invention is obtained by carbonizing and activating a protein or a sludge containing a protein or a waste material. To exhibit a high activity effective for decomposing hydrogen peroxide and hydrazine, Nitrogen content is 1
It is important that the content is up to 5% by weight, and if the nitrogen content is out of the above range, particularly if it is less than 1% by weight, the decomposition activity of hydrogen peroxide or hydrazine is significantly lowered, which is inconvenient. Further, it is desirable that the oxygen content and the carbon content are also within the above-mentioned ranges, and if the oxygen content and the carbon content are out of the above-mentioned ranges, a decrease in the decomposition activity of hydrogen peroxide or hydrazine is observed, and the intended purpose of the present invention is sufficiently exhibited. It cannot be done and is not preferable. The activated carbon material according to the present invention has an oxygen content and a carbon content of 5 to 30% by weight and 40 to 90% by weight, respectively, at the stage of performing the above-mentioned carbonization and activation treatment. Even the activated carbon material in this state has sufficiently high activity as a decomposition catalyst for hydrogen peroxide or hydrazine, but after the activation treatment described above, an acid treatment and then a heat treatment are performed to obtain an oxygen content and a carbon content. 3 each
It can be 10 to 10% by weight, 70 to 95% by weight, and is applied to a highly activated, for example, waste liquid containing strongly acidic hydrogen peroxide or a waste liquid containing high concentration hydrogen peroxide or hydrazine. It is more preferable to rapidly decompose and remove hydrogen peroxide or hydrazine. Therefore, effective decomposition and removal can be performed by appropriately selecting the catalyst composed of the activated carbon material of the present invention according to the type of the target liquid to be treated.

The activated carbon material of the present invention has an average pore radius of 15 to 30 Å as described above. When the average pore radius is smaller than 15 Å, and 30 Å
If it is larger than the above range, the resolution of hydrogen peroxide or hydrazine is low, which is not desirable and is preferably within the above range. Further, the activated carbon material according to the present invention has at least 50% by volume of the porous mesopores based on the total volume. The mesopores can be further enhanced by performing the activation treatment, then the acid treatment and the heat treatment, and the mesopores occupy at least 60% by volume based on the total volume. In the activated carbon material useful as a decomposition catalyst for hydrogen peroxide or hydrazine of the present invention, its specific surface area is not particularly limited, but it is preferably in the range of 300 to 1500 square meters / g in order to achieve the object of the present invention. Is preferred. In the present invention, the average pore radius and specific surface area of the activated carbon material and the mesopores having pores were determined by a nitrogen gas adsorption method using an autosorb measuring instrument (manufactured by Yuasa Ionics).

The activated carbon material of the present invention is obtained by carbonizing and activating a protein or a protein-containing sludge or a waste substance. Examples of proteins or protein-containing sludge or waste substances used in the production of the activated carbon material of the present invention include yeasts such as baker's yeast and chlorella; bacteria, algae, brewer's yeast fermentation waste cells, pharmaceutical fermentation yeast waste cells, amino acids. Microbial proteins such as fermentation dregs; surplus sludge of bioactive sludge such as factory waste liquid treatment, manure treatment, domestic wastewater treatment and the like. In addition, animal proteins such as fish, meat and animal blood; soybean,
Beans such as fatty soybeans and vegetable proteins such as wheat germ and rice germ can also be used. Of these, microbial proteins such as yeasts, bacteria, algae, and fermentation waste cells, or surplus sludge of bioactive sludge, are desirable from the viewpoint of handling and availability. The catalyst comprising the activated carbon material according to the present invention can be manufactured at a low cost because it uses the above-mentioned protein or protein-containing sludge or waste material as a raw material.

When the activated carbon material of the present invention is used as a catalyst, either a powder or a molded product can be used, and it is appropriately selected depending on the respective uses, places of use, situations of use and the like. In order to form a catalyst comprising the activated carbon material of the present invention into a molded article, the raw material protein or protein-containing sludge or a waste substance may be molded, carbonized, then activated, then pickled and heated. A binder may be used if necessary during molding. Examples of the binder include tar pitch, lignin, molasses,
Sodium alginate, carboxymethyl cellulose (CM
C), synthetic resins, organic binders such as polyvinyl alcohol and starch, and inorganic binders such as smectite and water glass. These binders may be used to such an extent that they can be molded, and are usually used in an amount of 0.05-2
About wt% is used.

The carbonization treatment for producing the activated carbon material of the present invention is carried out by removing or reducing non-carbon components mainly contained in the raw material protein or protein-containing sludge or waste material, and then carrying out the activation treatment to be carried out subsequently. This is a process of making a suitable material. This carbonization is usually 150-600
C., preferably at a temperature of 200 to 500.degree. C., for several minutes to several hours while introducing air, nitrogen, carbon dioxide or a mixed gas thereof. During this carbonization treatment, if the raw material protein or protein-containing sludge or waste substance powder, or a molded product is fused or welded, it becomes difficult to form the desired fine pores, and the activation treatment to be carried out next is also difficult. This is not preferable because it gives an adverse effect and an activated carbon material having good characteristics cannot be obtained. In order to prevent this fusion or welding, it is preferable to add a small amount of iron compound to the raw material. This iron compound not only prevents fusion or welding, but also improves the operability during the carbonization treatment and enables uniform carbonization treatment. Examples of the iron compound used for such purpose include ferrous sulfate, ferric sulfate, ferrous ammonium sulfate, ferric ammonium sulfate, ferric nitrate, ferric chloride, ferric chloride. ,
Inorganic iron such as ferrous phosphate, ferric phosphate, ferrous carbonate, ferrous hydroxide, ferric hydroxide, ferrous silicate, ferrous sulfide, ferric sulfide Compounds or salts thereof; ferric citrate, ferric ammonium citrate, ferrous oxalate,
Examples thereof include iron compounds of organic acids such as ferric ammonium oxalate and salts thereof. These iron compounds are added in an amount of about 1 to 20% by weight based on the raw materials.

The activation treatment carried out after the above carbonization treatment is a step of growing, developing, or aging the fine pore structure formed by the carbonization treatment into a finer structure, and mainly comprises water vapor, carbon dioxide gas, and oxygen. In a gas atmosphere, generally 700 to 1100 ° C., preferably 800 to 1000
It is carried out at ℃ for several minutes to several hours. In producing the activated carbon material of the present invention, carbonization treatment and activation treatment are carried out using an internal heating type or external heating type rotary kiln or tubular furnace, a continuous multi-stage furnace or the like.

The activity of the activated carbon material of the present invention, which is made of a protein or a sludge containing a protein or a waste material as a raw material, can be further improved by subjecting it to carbonization, activation, further acid treatment, and then heat treatment. The acid used for this acid treatment is usually an inorganic acid such as sulfuric acid, hydrochloric acid, nitric acid or hydrofluoric acid, and these are used in an aqueous solution of about 5 to 50% by weight. The acid treatment is carried out at room temperature to 100 ° C. for several minutes to several hours. After the acid treatment, it is washed with water and then heat-treated. This heat treatment is carried out with an inert gas such as nitrogen, helium, argon, carbon dioxide, hydrogen, ammonia,
400 to 110 under an atmosphere of a reducing gas such as carbon monoxide
It is carried out at 0 ° C., preferably 500 to 1000 ° C. for several minutes to several hours. In the present invention, the above-mentioned acid treatment removes impurity components in the activated carbon material, and heat treatment is performed to further grow, develop, or age the fine structure of the portions from which the impurity components have been removed. By performing heat treatment after the acid treatment, the decomposition activity is further improved as compared with that before the acid treatment.

The activated carbon material of the present invention can be obtained by using polyacrylonitrile-based carbon fiber as a raw material in addition to the above-mentioned protein or sludge containing the protein or a waste substance as a raw material. In this case, the polyacrylonitrile-based carbon fiber can be used in any form such as fibrous, felt-like, mat-like, and woven-like form, and is appropriately selected depending on each application, place of use, state of use, and the like. The activated carbon material of the present invention using this polyacrylonitrile-based carbon fiber as a raw material is an inert gas such as nitrogen, helium, argon, carbon dioxide or the like, hydrogen, ammonia, or monoxide, which is a polyacrylonitrile-based carbon fiber having the above-mentioned appropriate shape. It can be obtained by heat treatment at 400 to 1100 ° C., preferably 500 to 1000 ° C. for several minutes to several hours in an atmosphere of a reducing gas such as carbon. The polyacrylonitrile-based activated carbon fiber used in the present invention has acrylonitrile as a main component,
As a copolymerization component, for example, one of copolymerization monomers such as vinyl chloride, vinylidene chloride, acrylic acid, acrylic acid derivative, methacrylic acid, methacrylic acid derivative, acrylamide, N-methylolacrylamide, allylsulfonic acid and methallylsulfonic acid. Alternatively, it is an activated carbon fiber obtained by spinning, infusibilizing, and activating a polymer obtained by copolymerization with two or more kinds.

In the decomposition of hydrogen peroxide using the activated carbon material of the present invention as a catalyst, generally, an aqueous solution containing hydrogen peroxide, an organic solvent containing hydrogen peroxide, a waste liquid containing hydrogen peroxide, or the like is used. However, the method is not limited to such a method, and decomposition can also be carried out by contacting with the catalyst of the present invention in the state of mist or vapor of hydrogen peroxide. Further, when decomposing hydrogen peroxide in the liquid to be treated using the catalyst comprising the activated carbon material of the present invention, the pH of the liquid to be treated and the concentration of hydrogen peroxide in the liquid to be treated are not particularly limited,
It can be used in a wide range of liquid properties. Decomposition of hydrogen peroxide using the catalyst of the present invention can be carried out by either a batch method or a continuous method, and the temperature during the treatment, the treatment time and the like can be appropriately selected depending on the type of the liquid to be treated and the like.

When the activated carbon material of the present invention is used as a catalyst to decompose hydrazine, the decomposition treatment of hydrazine can be carried out particularly effectively by treating in the presence of an oxygen generator. Generally, a peroxygen compound is used as the oxygen generator, and examples of the peroxygen compound include hydrogen peroxide, sodium percarbonate, and sodium perborate. Decomposition of hydrazine in the presence of hydrogen peroxide is performed by the following equation. N ₂ H ₄ + 2H ₂ O ₂ → N ₂ + 4H ₂ O This decomposition reaction theoretically uses 2 equivalents of hydrogen peroxide for 1 equivalent of hydrazine compared to the conventional method using sodium hypochlorite. However, a slight excess of hydrogen peroxide is usually used. However, compared with the method using sodium hypochlorite, the amount of hydrogen peroxide used is much smaller and the cost can be saved. Moreover, the catalyst composed of the activated carbon material according to the present invention is used, and the presence of a peroxygen compound is When hydrazine is decomposed, it is safe because it does not generate any substances that may cause secondary pollution. In the case of decomposing hydrazine in a liquid to be treated containing hydrazine, the liquidity of the liquid to be treated (pH of the liquid) generally affects the decomposition rate and the like. As will be described later, the activated carbon used for conventional water treatment shows almost no activity when the liquid is alkaline, but the catalyst made of the activated carbon material according to the present invention has a liquid property of the liquid to be treated. It is not so much affected and is sufficiently active in a wide pH range. Further, when decomposing hydrazine using the activated carbon material according to the present invention as a catalyst, it can be carried out by either a batch method or a continuous method, and the temperature and time during the treatment are appropriately selected depending on the type of the liquid to be treated and the like. .

Next, the present invention will be explained more specifically with reference to Examples. (Production of Activated Carbon Material of the Present Invention)

[Example 1] Microbial waste cells (methanol-utilizing waste cells)
1000 parts (the same applies hereafter by weight), ferric nitrate 200
Parts, 20 parts of polyvinyl alcohol and 1000 parts of water were sufficiently kneaded with a kneader and granulated to obtain a molded body. The molded body was carbonized at 250 to 500 ° C. for 3 hours while introducing air, and then activated at 1000 ° C. for 2 hours in the presence of steam to obtain 256 parts of activated carbon material. This has a nitrogen content of 2.3% by weight and an oxygen content of 22.
The average pore radius was 21Å at 8 wt% and carbon content of 48.2 wt%, and the mesopores accounted for about 55% based on the total volume.

[0017]

Example 2 600 parts of water was added to 1000 parts of the dried product of the surplus sludge generated in the biological activated sludge treatment device of a chemical factory, and the mixture was sufficiently kneaded with a kneader and granulated to obtain a molded body. This molded body was carbonized at 200 to 500 ° C. for 2 hours in a nitrogen gas atmosphere, and then activated for 1 hour at 800 ° C. in a mixed gas of steam / carbon dioxide gas = 1 (volume ratio) to give 221 parts. Of activated carbon material was obtained. This has a nitrogen content of 2.
7% by weight, oxygen content 8.8% by weight, carbon content 77.
At 9% by weight, the average pore radius was 26Å, and the total volume of mesopores accounted for about 68%.

[0018]

Example 3 The same raw material (waste microorganism cells) as in Example 1 was carbonized and activated under the same conditions as in Example 1, and then heated at 90 ° C. for 2 hours using a 30 wt% hydrochloric acid aqueous solution. did. Then, it was washed with water and further heated at 800 ° C. for 1 hour in a carbon dioxide atmosphere to obtain 202 parts of activated carbon material. It has a nitrogen content of 3.2% by weight, an oxygen content of 8.2% by weight, a carbon content of 81.6% by weight, an average pore radius of 19Å, and a total volume of mesopores of about 61%. It was

[0019]

Example 4 The same raw material as in Example 2 (excess sludge generated in the bioactive sludge treatment device) was carbonized and activated under the same conditions as in Example 2, and then treated with a 50 wt% sulfuric acid aqueous solution at 60 ° C.
Heated for 5 hours. Then wash with water and 900 ℃
And heat-treated in a hydrogen gas atmosphere for 1 hour to obtain 189 parts of activated carbon material. The obtained activated carbon material had a nitrogen content of 4.1% by weight, an oxygen content of 7.6% by weight, a carbon content of 83.2% by weight, an average pore radius of 26 Å, and a mesopore volume of about 3%. Accounted for 73%.

[0020]

Example 5 100 g of commercially available polyacrylonitrile-based activated carbon fiber FE-400 (manufactured by Toho Rayon Co., Ltd.) was heat-treated at 950 ° C. for 1 hour in a tubular heating furnace under a nitrogen gas atmosphere to obtain 89 g of activated carbon material. Obtained. It had a nitrogen content of 2.1% by weight, an oxygen content of 8.5% by weight, a carbon content of 86.8% by weight, an average pore radius of 20Å, and mesopores accounted for about 56% of the total volume. .

(Decomposition of hydrogen peroxide)

Example 6 A decomposition test of hydrogen peroxide in an aqueous solution containing hydrogen peroxide was carried out using the activated carbon materials obtained in the above Examples 1 and 2 as a catalyst. That is, hydrogen peroxide 413
800 g of factory wastewater containing 0 ppm and having a pH of 6.5 was collected in each container, and 0.15 g of the catalyst made of the activated carbon material obtained in Examples 1 and 2 was added to each container and stirred at 25 ° C. As a result of measuring the concentration of hydrogen peroxide in the wastewater after 30 minutes, almost 93% of the hydrogen peroxide was decomposed after 15 minutes and almost 100% was decomposed after 30 minutes. Further, using the activated carbon materials obtained in Examples 3, 4 and 5 as a catalyst, a hydrogen peroxide decomposition test was conducted using the same factory wastewater as above. That is, 0.11 g of the catalyst composed of the activated carbon materials obtained in Examples 3, 4 and 5 was added to each,
Stir at 25 ° C. As a result of measuring the concentration of hydrogen peroxide in the waste water after 30 minutes, almost 90% of the hydrogen peroxide decomposed after 10 minutes and almost 100% after 20 minutes.
Was disassembled.

[0022]

Comparative Example 1 A decomposition test of hydrogen peroxide was conducted under the same conditions as in Example 6 using 0.15 g of a commercially available activated carbon for water treatment, Diasorb G (manufactured by Mitsubishi Kasei Co., Ltd.). The decomposition rate after 30 minutes was only about 5%. The activated carbon diasorb G used had a nitrogen content of 0.5% by weight, an oxygen content of 5.6% by weight, a carbon content of 90.8% by weight, and an average pore radius of 13 Å per total volume. Mesopores accounted for about 15%.

[0023]

Example 7 Using the activated carbon materials obtained in Examples 1 and 2 above as a catalyst, a decomposition test of hydrogen peroxide in a metal surface treatment waste liquid was conducted. That is, hydrogen peroxide 4500 pp
Metal surface treatment waste liquid containing m and having a pH of 2 (sulfuric acid) 8
00 g was placed in each container, and 0.15 g of the catalyst made of the activated carbon material obtained in Examples 1 and 2 was added to each container and stirred at 25 ° C. As a result of measuring the concentration of hydrogen peroxide in the waste liquid after 60 minutes, about 97% of the catalysts were decomposed after 30 minutes and almost 10% after 45 minutes in all the catalysts.
0% decomposed. Also, using the activated carbon materials obtained in Examples 3, 4 and 5 as a catalyst, under the same conditions as above,
The decomposition test of hydrogen peroxide in the same aqueous solution as above was performed. As a result, as a result of measuring the concentration of hydrogen peroxide in the waste liquid after 60 minutes, almost 95% of the catalysts were decomposed after 25 minutes and almost 100% were decomposed after 35 minutes.

[0024]

Comparative Example 2 Using the same catalyst as used in Comparative Example 1, the same decomposition test of hydrogen peroxide in the metal surface treatment waste liquid as used in Example 7 was conducted. The decomposition rate after 45 minutes was about 5%, and the decomposition rate after 60 minutes was less than 10%.

(Decomposition of hydrazine)

Example 8 A decomposition test of hydrazine in hydrazine-containing ammonia water was conducted using the catalyst composed of the activated carbon material obtained in Examples 1 and 2 above. That is, hydrogen peroxide was added to wastewater of a chemical plant containing 700 ppm of hydrazine and 28% by weight of ammonia so that the hydrogen peroxide concentration would be 7,000 ppm. 800 g of this drainage was taken in a positive manner, 0.3 g of the catalyst composed of the activated carbon material obtained in Example 1 or 2 was added, and the mixture was stirred at 25 ° C. As a result of measuring the concentration of hydrazine in the waste water after 60 minutes, about 82% was decomposed after 30 minutes and almost 99% was decomposed after 60 minutes when any catalyst was used.

[0026]

Example 9 Instead of the hydrazine-containing ammonia water of Example 8 above, a decomposition test of hydrazine in a boiler waste liquid containing hydrazine was conducted. That is, hydrogen peroxide was added to a boiler waste liquid containing 700 ppm of hydrazine so that the hydrogen peroxide concentration would be 3000 ppm. 800 g of this solution was taken in each case to give Example 1 or 2
Each 0.1 g of the catalyst made of the activated carbon material obtained in the above was added and stirred at 25 ° C. As a result of measuring the concentration of hydrazine in the waste water after 60 minutes, about 88% was decomposed after 30 minutes and almost 99% was decomposed after 60 minutes when any catalyst was used.

[0027]

Comparative Example 3 Using the same activated carbon as used in Comparative Example 1, the same decomposition test of hydrazine in the waste liquid as used in Example 9 was conducted under the same conditions as in Example 9. The decomposition rate after 30 minutes was about 33%, and the decomposition rate after 60 minutes was only 48%.

[0028]

The activated carbon material of the present invention comprises various compounds,
For example, it is effective as a decomposition catalyst for hydrogen peroxide, hydrazine, and the like, and is effective for treating waste liquid generated from a chemical plant or waste liquid waste generated during semiconductor treatment. When decomposing hydrogen peroxide or hydrazine using the catalyst composed of the activated carbon material according to the present invention, a wide range of liquid (pH
Area), high activity over a long period of time, and can be decomposed without secondary pollution.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location C02F 11/00 N 7824-4D (72) Inventor Mayumi Takahashi Niigata City Niigata City Tayuhama Niiwari 182 Address Mitsubishi Gas Chemical Co., Ltd. Niigata Research Laboratory (72) Inventor Tetsuo Aoyama 182 Shinwari, Tayuhama, Niigata City, Niigata Prefecture Mitsubishi Gas Chemical Co., Ltd. Niigata Research Laboratory

Claims (11)

[Claims] 1. Containing 1 to 5% by weight of nitrogen, 3 to 30% by weight of oxygen, 40 to 95% by weight of carbon, having an average pore radius of 15 to 30Å, and having at least 50 perforated mesopores per total volume. Activated carbon material characterized by occupying volume%. 2. Nitrogen 1-5% by weight, oxygen 3-10% by weight
The activated carbon material according to claim 1, wherein the carbon content is 70 to 95% by weight. 3. The activated carbon material according to claim 1, which is obtained by carbonizing and activating a protein or a sludge containing protein or a waste substance. 4. The activated carbon material according to claim 2, which is obtained by carbonizing and activating a protein or a protein-containing sludge or a waste substance, followed by acid treatment and heating. 5. The activated carbon material according to claim 3 or 4, wherein the protein or protein-containing sludge or waste substance is a microbial protein or bioactive sludge. 6. The microbial protein is one selected from yeast, bacteria, and algae, and the protein-containing sludge or waste substance is selected from bioactive sludge used for factory waste liquid treatment, manure treatment, and domestic wastewater treatment. The activated carbon material according to claim 4 or 5, which is one kind or a kind selected from waste bacterial cells and amino acid fermentation lees. 7. A protein, or a sludge or a waste material containing protein, which is molded or unmolded 150 to 6
The method for producing an activated carbon material according to claim 1, wherein carbonization is performed at 00 ° C., and then activation is performed at 700 to 1100 ° C. in a gas atmosphere mainly composed of steam, carbon dioxide, and oxygen. 8. A protein or a sludge containing protein or a waste substance is molded with or without molding in a range of 150 to 60.
After carbonization at 0 ° C., then activation at 700 to 1100 ° C. in a gas atmosphere mainly composed of steam, carbon dioxide, and oxygen, then acid treatment, and then in an atmosphere of an inert gas or a reducing gas. The method for producing an activated carbon material according to claim 2, wherein heating is performed at 400 to 1100 ° C. 9. The activated carbon material according to claim 1 or 2, wherein the polyacrylonitrile fibrous activated carbon material is heated at 400 to 1100 ° C. in an atmosphere of a reducing gas. 10. A catalyst for decomposing hydrogen peroxide, which comprises the activated carbon material according to claim 1, 2, or 9. 11. A catalyst for decomposing hydrazine, which comprises the activated carbon material according to claim 1, 2, or 9.