Preparation method and application of activated carbon for organic wastewater treatment

Abstract

The invention belongs to the technical field of activated carbon, and particularly relates to a preparation method and application of activated carbon for organic wastewater treatment. The preparation method of the activated carbon comprises the following steps: (1) mixing pulverized coal, biomass powder and a binder to obtain mixed powder; and (2) carbonizing and activating the mixed powder to obtain the activated carbon. The preparation method has the beneficial effects that biomass is adopted as a main raw material for preparation of the activated carbon, the problems of resource waste and environmental pollution caused by discarding and burning of the biomass are solved, and the obtained activated carbon is high in specific surface area, rich in pores, relatively large in average pore size, developed in mesopores, low in floating rate and high in adsorption capacity. The adsorbent is suitable for adsorbing macromolecular pollutants in organic wastewater, has relatively high selective adsorption capacity on organic macromolecules, and can meet the treatment requirements of industrial organic wastewater. The adsorbent can be used for adsorbing and purifying organic wastewater in industries such as chemical industry, food and medicine.

Description

Technical Field

[0001] The invention belongs to the technical field of activated carbon, and specifically relates to a preparation method and application of activated carbon for organic wastewater treatment. Background Art

[0002] As a carbonaceous adsorption material with rich pore structure, huge specific surface area, good chemical stability, strong adsorption performance and wear resistance, activated carbon is widely used in many fields of production and life. With the continuous expansion of the application market, its production scale, production process and production raw materials have developed greatly. With the growth of consumer demand and the increasing support of the country for the activated carbon industry, my country has gradually become a major producer of activated carbon. Therefore, it can be considered that as an industry mainly used in the field of environmental protection, the development of the activated carbon industry is in the ascendant. And with the continuous improvement of environmental protection policies and environmental awareness, the activated carbon market will usher in a faster development, and the market demand will show a stable growth trend.

[0003] Activated carbon is made of carbon-containing substances and contains a large number of pores. It can adsorb organic pollutants and inorganic substances. Its adsorption capacity depends on its own pore size distribution and the molecular size of the adsorbed substance. Wastewater is one of the important uses of activated carbon adsorption treatment, but the activated carbon for wastewater treatment on the market is mainly microporous activated carbon, which cannot meet the demand for medium and large pores for organic wastewater treatment.

[0004] Biomass, as a type of wood raw material, can theoretically be used as one of the raw materials for the production of activated carbon. However, the pores of activated carbon produced from biomass such as wheat straw and peanut shells are relatively loose, the mesopore ratio of biomass activated carbon is high, the bulk density is low, and the floating rate is high when used for liquid phase adsorption. This phenomenon limits its application field. Coal-based activated carbon has a large bulk density and its pore structure is mainly micropores, which is not suitable for the adsorption of larger molecular pollutants, especially pollutants in organic wastewater are mostly organic molecules with large sizes, which cannot be adsorbed by micropores with smaller pore sizes. Summary of the invention

[0005] The present application provides a method for preparing activated carbon for treating organic wastewater and its application, aiming to solve the problem that the pores of coal-based activated carbon products in the prior art are mainly micropores, which make it difficult to effectively adsorb large molecular organic pollutants in wastewater, and that although biomass activated carbon has a large average pore size, it has a low bulk density and is easy to float, affecting its performance.

[0006] The first aspect of the present application provides a method for preparing activated carbon for organic wastewater treatment, comprising the following steps:

[0007] (1) mixing coal powder, biomass powder, a binder and optionally water to obtain a mixture;

[0008] (2) The mixed material is subjected to carbonization and activation treatment to obtain activated carbon.

[0009] According to some embodiments of the method for preparing activated carbon for organic wastewater treatment described in the present application, in step (1), the particle size of the coal powder and the biomass powder is 150-200 mesh.

[0010] According to some embodiments of the method for preparing activated carbon for organic wastewater treatment described in the present application, the water content of the coal powder and the biomass powder is 0.5%-5%.

[0011] According to some embodiments of the method for preparing activated carbon for organic wastewater treatment described in the present application, in step (1), the biomass powder includes one or more of wheat straw, peanut shells and soybean straw.

[0012] According to some embodiments of the method for preparing activated carbon for organic wastewater treatment described in the present application, the binder includes one or more of coal tar, asphalt, water-soluble starch, pulp waste liquid and molasses.

[0013] According to some embodiments of the method for preparing activated carbon for organic wastewater treatment described in the present application, in step (1), the mass ratio of the coal powder to the biomass powder is 100:(10-50).

[0014] According to some embodiments of the method for preparing activated carbon for organic wastewater treatment described in the present application, the mass ratio of the total amount of the coal powder and the biomass powder to the binder is 100:(20-60).

[0015] According to some embodiments of the method for preparing activated carbon for organic wastewater treatment described in the present application, the mass ratio of the total amount of the coal powder, biomass powder and binder to the water is 100:(0-20).

[0016] According to some embodiments of the method for preparing activated carbon for organic wastewater treatment described in the present application, the carbonization temperature is 600-700° C., and the carbonization time at this temperature is 20-40 min.

[0017] According to some embodiments of the method for preparing activated carbon for organic wastewater treatment described in the present application, the carbonization temperature is 600-650°C.

[0018] According to some embodiments of the method for preparing activated carbon for organic wastewater treatment described in the present application, the heating rate of the carbonization process is 10-20°C / min.

[0019] According to some embodiments of the method for preparing activated carbon for organic wastewater treatment described in the present application, the carbonization is performed in an inert atmosphere.

[0020] According to some embodiments of the method for preparing activated carbon for organic wastewater treatment described in the present application, the activation is performed under the action of an activating agent.

[0021] According to some embodiments of the method for preparing activated carbon for organic wastewater treatment described in the present application, the activating agent includes water vapor and / or carbon dioxide.

[0022] According to some embodiments of the method for preparing activated carbon for organic wastewater treatment described in the present application, the activation temperature is 800-950° C., and the activation time at this temperature is 0.5-2 h.

[0023] According to some embodiments of the method for preparing activated carbon for organic wastewater treatment described in the present application, the method for preparing activated carbon further comprises kneading and molding the mixture and drying the mixture before carbonization.

[0024] According to some embodiments of the method for preparing activated carbon for organic wastewater treatment described in the present application, the kneading pressure is 18-25 MPa.

[0025] According to some embodiments of the method for preparing activated carbon for organic wastewater treatment described in the present application, the drying temperature is 105-120° C., and the drying time is 6-12 hours.

[0026] According to some embodiments of the method for preparing activated carbon for treating organic wastewater described in the present application, the specific surface area of ​​the activated carbon is 700-1200m 2 / g.

[0027] According to some embodiments of the method for preparing activated carbon for organic wastewater treatment described in the present application, the mesoporosity of the activated carbon is 40%-60%.

[0028] The second aspect of the present application provides a method for purifying organic wastewater, which is performed using the activated carbon described in the first aspect of the present application. DETAILED DESCRIPTION

[0030] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0031] The present invention provides a method for preparing activated carbon for treating organic wastewater, comprising the following steps:

[0032] (1) mixing coal powder, biomass powder, a binder and optionally water to obtain a mixture;

[0033] (2) The mixed material is subjected to carbonization and activation treatment to obtain activated carbon.

[0034] The preparation of the activated carbon described in this application uses biomass as the main raw material, which solves the problem of resource waste and environmental pollution caused by the abandonment and burning of biomass, and the obtained activated carbon has a high specific surface area, rich pores, a large average pore size, developed mesopores, and a low floating rate. It is suitable for adsorbing macromolecular pollutants in organic wastewater and has a high selective adsorption capacity for organic macromolecules, which can meet the requirements for the treatment of industrial organic wastewater. It can be used for adsorption and purification of organic wastewater in the chemical, food, pharmaceutical and other industries.

[0035] The method for preparing activated carbon for organic wastewater treatment described in the present application uses coal and biomass waste as raw materials, has the advantages of protecting the environment, wide sources, and low prices. At the same time, the process is relatively simple and easy to industrialize.

[0036] In some embodiments of the present application, in step (1), the particle size of the coal powder and the biomass powder is 150-200 mesh, for example, 150 mesh, 160 mesh, 180 mesh, 200 mesh, etc. Selecting materials with such particle size can not only ensure the uniformity of the pores of subsequent products and the requirements of their strength and density, but also can be easily and economically realized in actual production.

[0037] In some embodiments of the present application, the water content of the coal powder and the biomass powder is 0.5%-5%, such as 0.5%, 1%, 2%, 3%, 4%, 5%, etc. If the water content is too high, it will be disadvantageous for the milling and screening of the raw materials, and will increase energy consumption and production costs.

[0038] In some embodiments of the present application, the raw coal and biomass are initially crushed into 4-8 mesh granular materials using a pulverizer, the granular materials are placed in a constant temperature drying oven at a drying temperature of 120° C., dried for 0.5-4 hours, and then the dried materials are ground into fine powder materials using a pulverizer.

[0039] In some embodiments of the present application, in step (1), the biomass powder includes one or more of wheat straw, peanut shells and soybean straw.

[0040] In some embodiments of the present application, the binder includes one or more of coal tar, asphalt, water-soluble starch, pulp waste liquid and molasses.

[0041] In some embodiments of the present application, in step (1), the mass ratio of the coal powder to the biomass powder is 100:(10-50), such as 100:10, 100:20, 100:28, 100:32, 100:39, 100:43, 100:46, 100:50, etc. This mass ratio can ensure that the prepared activated carbon has both a high density to avoid floating and a suitable porosity.

[0042] In some embodiments of the present application, the mass ratio of the total amount of the coal powder and the biomass powder to the binder is 100:(20-60), for example, 100:20, 100:26, 100:32, 100:48, 100:53, 100:60, etc.

[0043] In some embodiments of the present application, the mass ratio of the total amount of the coal powder, biomass powder and binder to the water is 100:(0-20), for example, 100:0.01, 100:0.5, 100:5, 100:10, 100:12, 100:15, 100:20, etc.

[0044] In some embodiments of the present application, the carbonization temperature is 600-700°C, such as 600°C, 620°C, 650°C, 680°C, 700°C, etc., and the carbonization time at this temperature is 20-40min, such as 20min, 25min, 30min, 32min, 36min, 40min, etc. This carbonization condition can ensure that the activated carbon produces initial pores and a higher yield.

[0045] In some embodiments of the present application, the carbonization temperature is 600-650°C.

[0046] In some embodiments of the present application, the heating rate of the carbonization process is 10-20°C / min, such as 10°C / min, 12°C / min, 15°C / min, 18°C / min, 20°C / min, etc. This heating rate can ensure the uniformity of product pores and production efficiency.

[0047] In some embodiments of the present application, the heating rate of the carbonization process is 10-12°C / min.

[0048] In some embodiments of the present application, the carbonization is performed in an inert atmosphere.

[0049] In some embodiments of the present application, the activation is performed under the action of an activating agent.

[0050] In some embodiments of the present application, the activating agent includes water vapor and / or carbon dioxide, and the introduction of the activating agent can generate abundant pores.

[0051] In some embodiments of the present application, the activation temperature is 800-950°C, such as 800°C, 850°C, 880°C, 920°C, 950°C, etc., and the activation is performed at this temperature for 0.5-2h, such as 0.5h, 1.0h, 1.5h, 2.0h, etc. This activation condition can ensure that the activated carbon produces more abundant pores and higher strength.

[0052] In some embodiments of the present application, the method for preparing activated carbon for organic wastewater treatment further includes kneading and drying the mixture before carbonization.

[0053] In some embodiments of the present application, the kneading pressure is 18-25MPa, such as 18MPa, 20MPa, 22MPa, 25MPa, etc. In some embodiments of the present application, the diameter of the extruded material is 1.0-3.0mm, such as 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, etc., and the column height is 2.0-10.0mm, such as 2mm, 3mm, 5mm, 7mm, 8mm, 10mm, etc. After molding, it is naturally air-dried for 2-10h, and then screened and carbonized.

[0054] In some embodiments of the present application, the drying temperature is 105-120° C., and the drying time is 6-12 hours.

[0055] In some embodiments of the present application, the specific surface area of ​​the activated carbon is 700-1200m 2 / g, and the mesoporosity is 40%-60%.

[0056] The embodiment of the present application also provides a method for purifying organic wastewater, which is purified by using activated carbon prepared by the method described above in the present application.

[0057] The solution of this application is further explained below with reference to specific implementation cases.

[0058] Example 1

[0059] A method for preparing activated carbon for treating organic wastewater comprises the following steps:

[0060] Anthracite and biomass wheat straw are crushed into 4-8 mesh granular materials by a pulverizer, and dried in a constant temperature drying oven at 105°C for 0.5h to a moisture content of 1%. The dried materials are placed in a pulverizer and ground into powdery materials, and the particle size of the powdery materials is controlled to be 150-200 mesh. Coal powder and straw powder are evenly mixed in a mass ratio of 100:30 to obtain a mixed material.

[0061] The mixture, coal tar binder and water are then added into a kneader for kneading. The mass ratio of the mixture to the binder is 100:40, and the ratio of the total amount of the mixture and the coal tar binder to water is 100:10. The mixture is then molded into a cylindrical molding with a diameter of 2.0 mm and a height of 5 mm. The molding pressure is 20 MPa, and the molding is dried at a temperature of 105°C for 12 hours.

[0062] The cylindrical material was loaded into a rotary carbonization furnace, nitrogen was introduced, and the temperature was raised to 600°C at a rate of 10°C / min. The temperature was kept constant at this temperature for 30 minutes. Then, under nitrogen protection, the temperature was lowered to below 100°C before discharging the material. The powder was then sieved to remove the carbonized material for subsequent activation. Water vapor was used as an activator for activation at 800°C for 2 hours to obtain the activated carbon. The specific surface area of ​​the product is 986.3m 2 / g, average pore size 3.86nm, bulk density 574mg / L, methylene blue 120mg / g, no floating phenomenon in water.

[0063] Example 2

[0064] The difference between the method for preparing activated carbon for treating organic wastewater described in Example 2 and Example 1 is that the mass ratio of anthracite and biomass wheat straw is different. The mass ratio of anthracite and biomass wheat straw in the preparation method described in Example 2 is 100:40.

[0065] The specific operations are:

[0066] Anthracite and biomass wheat straw are crushed into 4-8 mesh granular materials by a pulverizer, and dried in a constant temperature drying oven at 105°C for 0.5h to a moisture content of 1%. The dried materials are placed in a pulverizer and ground into powdery materials, and the particle size of the powdery materials is controlled to be 150-200 mesh. Coal powder and straw powder are evenly mixed in a mass ratio of 100:40 to obtain a mixed material.

[0067] The mixture, coal tar binder and water are then added into a kneader for kneading. The mass ratio of the mixture to the binder is 100:40, and the ratio of the total amount of the mixture and coal tar binder to water is 100:10. The mixture is then molded into a cylindrical molding with a diameter of 2.0 mm and a height of 5 mm. The molding pressure is 20 MPa, and the molding is dried at 105°C for 12 hours.

[0068] The cylindrical material is loaded into a rotary carbonization furnace, nitrogen is introduced, and the temperature is raised to 600°C at a heating rate of 10°C / min, and the temperature is kept constant at this temperature for 30 minutes. Then, under the protection of nitrogen, the temperature is lowered to below 100°C before discharging the material, and then the powder is sieved to remove the carbonized material for subsequent activation. The activation uses water vapor as an activating agent and is activated at a temperature of 800°C for 2 hours to obtain the activated carbon.

[0069] Example 3

[0070] The only difference between the method for preparing activated carbon for treating organic wastewater described in Example 3 and that in Example 1 is that the mass ratio of anthracite and biomass wheat straw is different. The mass ratio of anthracite and biomass wheat straw in the preparation method described in Example 3 is 100:10.

[0071] The specific operations are:

[0072] Anthracite and biomass wheat straw are crushed into 4-8 mesh granular materials by a pulverizer, and dried in a constant temperature drying oven at 105°C for 0.5h to a moisture content of 1%. The dried materials are placed in a pulverizer and ground into powdery materials, and the particle size of the powdery materials is controlled to be 150-200 mesh. Coal powder and straw powder are evenly mixed in a mass ratio of 100:10 to obtain a mixed material.

[0073] The mixed material and coal tar binder are then added into a kneader for kneading. The mass ratio of the mixed material to the binder is 100:40, and the ratio of the total amount of the mixed material and the coal tar binder to water is 100:10. The mixture is then molded into a cylindrical molding with a diameter of 2.0 mm and a height of 5 mm. The molding pressure is 20 MPa, and the molding is dried at a temperature of 105°C for 12 hours.

[0074] The cylindrical material is loaded into a rotary carbonization furnace, nitrogen is introduced, and the temperature is raised to 600°C at a heating rate of 10°C / min, and the temperature is kept constant at this temperature for 30 minutes. Then, under the protection of nitrogen, the temperature is lowered to below 100°C before discharging the material, and then the powder is sieved to remove the carbonized material for subsequent activation. The activation uses water vapor as an activating agent and is activated at a temperature of 800°C for 2 hours to obtain the activated carbon.

[0075] Example 4

[0076] The only difference between the method for preparing activated carbon for treating organic wastewater described in Example 4 and that in Example 1 is that the mass ratio of anthracite and biomass wheat straw is different. The mass ratio of anthracite and biomass wheat straw in the preparation method described in Example 4 is 100:50.

[0077] The specific operations are:

[0078] Anthracite and biomass wheat straw are crushed into 4-8 mesh granular materials by a pulverizer, and dried in a constant temperature drying oven at 105°C for 0.5h to a moisture content of 1%. The dried materials are placed in a pulverizer and ground into powdery materials, and the particle size of the powdery materials is controlled to be 150-200 mesh. Coal powder and straw powder are evenly mixed in a mass ratio of 100:50 to obtain a mixed material.

[0079] The mixture, coal tar binder and water are then added to a kneader for kneading, the mass ratio of the mixture to the binder is 100:40, the total amount of the mixture and the coal tar binder to water is 100:10, and then formed into a cylindrical molding with a diameter of 2.0 mm and a height of 5 mm, the molding pressure is 20 MPa, and the molding is dried at a temperature of 105°C for 12 hours.

[0080] The cylindrical material is loaded into a rotary carbonization furnace, nitrogen is introduced, and the temperature is raised to 600°C at a heating rate of 10°C / min, and the temperature is kept constant at this temperature for 30 minutes. Then, under the protection of nitrogen, the temperature is lowered to below 100°C before discharging the material, and then the powder is sieved to remove the carbonized material for subsequent activation. The activation uses water vapor as an activating agent and is activated at a temperature of 800°C for 2 hours to obtain the activated carbon.

[0081] Example 5

[0082] The only difference between the method for preparing activated carbon for treating organic wastewater described in Example 5 and that in Example 1 is that the carbonization temperature is different. The carbonization temperature of the preparation method described in Example 5 is 650°C.

[0083] Example 6

[0084] The only difference between the method for preparing activated carbon for treating organic wastewater described in Example 6 and that in Example 1 is that the carbonization temperature is different. The carbonization temperature of the preparation method described in Example 6 is 700°C.

[0085] Example 7

[0086] The method for preparing activated carbon for treating organic wastewater described in Example 7 is different from that in Example 1 only in that the heating rate of the carbonization process is different. The heating rate of the carbonization process of the preparation method described in Example 7 is 15°C / min.

[0087] Example 8

[0088] The only difference between the method for preparing activated carbon for treating organic wastewater described in Example 8 and that in Example 1 is that the heating rate of the carbonization process is different. The heating rate of the carbonization process of the preparation method described in Example 8 is 20°C / min.

[0089] Example 9

[0090] The preparation method of activated carbon for organic wastewater treatment described in Example 9 is different from that in Example 1 only in that the activation temperature is different. The activation temperature of the preparation method described in Example 9 is 950°C.

[0091] Example 10

[0092] The preparation method of activated carbon for organic wastewater treatment described in Example 10 is different from that in Example 1 only in that the activation temperature is different. The activation temperature of the preparation method described in Example 10 is 880°C.

[0093] Embodiment 11

[0094] The preparation method of activated carbon for organic wastewater treatment described in Example 11 is different from that in Example 1 only in that the activation time is different. The activation time of the preparation method described in Example 11 is 0.5 h.

[0095] Example 12

[0096] The preparation method of activated carbon for organic wastewater treatment described in Example 12 is different from that in Example 1 only in that the activation time is different. The activation time of the preparation method described in Example 12 is 1 hour.

[0097] The physical properties of the activated carbon described in Examples 1 to 12 of the present application were studied, and the results are shown in Table 1.

[0098] Table 1

[0099] <![CDATA[Specific surface area m 2 / g]]> Average pore size nm Bulk density mg / L Methylene blue mg / g Does it float in water? Example 1 986.3 3.86 574 120 no Example 2 935 4.03 566 115 no Example 3 1011.4 3.57 583 118 no Example 4 887.7 4.28 536 109 no Example 5 893 3.76 564 121 no Example 6 864 3.65 581 113 no Example 7 786.6 3.61 586 109 no Example 8 751.2 3.58 588 102 no Example 9 1016 3.80 603 117 no Example 10 995.3 3.81 597 116 no Embodiment 11 705.3 3.13 479 88 no Example 12 723 3.16 512 93 no

[0100] Note: The determination methods of various indicators in the examples of this application are all carried out in accordance with "GB / T 7702 Test method for coal-based granular activated carbon".

[0101] It can be seen from Table 1 that the activated carbon prepared according to the activated carbon preparation method provided in this application has the advantages of coal-based activated carbon and biomass-based activated carbon. The obtained activated carbon has rich pores and a specific surface area of ​​700-1200m 2 / g; the average pore size is above 3.10nm, mainly mesopores; the bulk density is high, and there is no floating problem; the methylene blue adsorption value is about 100mg / g, and it has a good adsorption effect on large molecular pollutants.

[0102] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A method for preparing activated carbon for organic wastewater treatment, characterized in that: The following steps are involved: (1) mixing coal powder, biomass powder, a binder and optionally water to obtain a mixture; (2) The mixed material is subjected to carbonization and activation treatment to obtain activated carbon.

2. The method for preparing activated carbon for treating organic wastewater according to claim 1, characterized in that: In step (1), the particle size of the coal powder and the biomass powder is 150-200 mesh; And / or, the water content of the coal powder and the biomass powder is 0.5%-5%.

3. The method for preparing activated carbon for organic wastewater treatment according to claim 1, characterized in that: In step (1), the biomass powder includes one or more of wheat straw, peanut shells and soybean straw; And / or, the binder includes one or more of coal tar, asphalt, water-soluble starch, pulp waste liquid and molasses.

4. The method for preparing activated carbon for treating organic wastewater according to claim 1, characterized in that: In step (1), the mass ratio of the coal powder to the biomass powder is 100:(10-50); and / or, the mass ratio of the total amount of the coal powder and the biomass powder to the binder is 100:(20-60); And / or, the mass ratio of the total amount of the coal powder, biomass powder and binder to the water is 100:(0-20).

5. The method for preparing activated carbon for treating organic wastewater according to claim 1, characterized in that: The carbonization temperature is 600-700°C, preferably 600-650°C, and the carbonization time at this temperature is 20-40min; Preferably, the heating rate of the carbonization process is 10-20°C / min, preferably 10-12°C / min; Preferably, the carbonization is performed in an inert atmosphere.

6. The method for preparing activated carbon for treating organic wastewater according to claim 1, characterized in that: The activation is carried out under the action of an activator; Preferably, the activating agent comprises water vapor and / or carbon dioxide.

7. The method for preparing activated carbon for treating organic wastewater according to claim 1, characterized in that: The activation temperature is 800-950° C., and the activation time at this temperature is 0.5-2 h.

8. The method for preparing activated carbon for treating organic wastewater according to claim 1, characterized in that: The method for preparing activated carbon for treating organic wastewater also includes kneading and forming the mixture and drying it before carbonization; Preferably, the kneading pressure is 18-25 MPa; Preferably, the drying temperature is 105-120° C., and the drying time is 6-12 hours.

9. The method for preparing activated carbon for treating organic wastewater according to claim 1, characterized in that: The specific surface area of ​​the activated carbon is 700-1200m 2 / g; And / or, the mesoporosity of the activated carbon is 40%-60%.

10. A method for purifying organic wastewater, characterized in that: Purification is carried out using the activated carbon described in any one of claims 1 to 9 of the present application.