Efficient composite carbon source for sewage treatment agent and preparation method of efficient composite carbon source

Abstract

The invention relates to the technical field of sewage treatment, and discloses an efficient composite carbon source for a sewage treatment agent and a preparation method thereof.The composite carbon source comprises a component A and a component B. The component B is prepared by taking activated carbon as a base material and taking a natural zeolite modifier and the like as an additive through mixing and sintering processes. The natural zeolite modified material is prepared by modifying a polymeric macromolecular substance on the surface of natural zeolite, and the polymeric macromolecular substance structure contains rich sulfydryl functional groups and pyridine dimethylamine structures and can form coordination and complexation with heavy metal ions in sewage, so that the heavy metal ions are firmly limited on the surface of a carbon source, and the heavy metal ions in the sewage can be recycled. In addition, the natural zeolite has a rich pore structure similar to activated carbon and can generate a physical adsorption effect on heavy metal ions in sewage, so that physical-chemical dual adsorption is realized, and the surface of the prepared composite carbon source has excellent heavy metal ion adsorption capacity.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and specifically to a high-efficiency composite carbon source for wastewater treatment agents and its preparation method. Background Technology

[0002] With the acceleration of global industrialization, the discharge of industrial wastewater continues to rise. This wastewater contains a large number of pollutants, with organic pollutants and heavy metals accounting for a significant proportion. Traditional wastewater treatment processes, such as chemical precipitation and biological treatment, are often limited by low treatment efficiency, high operating costs, or the risk of secondary pollution when dealing with wastewater with high concentrations and complex compositions. For example, hexavalent chromium in electroplating wastewater is expensive and therefore difficult to promote on a large scale.

[0003] Activated carbon, due to its unique physicochemical properties, has become a versatile agent in wastewater treatment. Its large specific surface area and well-developed pore structure give it excellent adsorption capacity, making it a key means of solving high-concentration wastewater problems since its introduction. However, conventional activated carbon adsorption of heavy metal ions often relies on its high specific surface area and porosity. This adsorption method has limited capacity, and for high-concentration wastewater, using activated carbon alone often requires a large dosage. Furthermore, the physical adsorption method of pure activated carbon can easily lead to pollutant leakage and secondary pollution. In addition, using activated carbon alone is insufficient for effectively cleaning organic wastewater. Therefore, developing a composite carbon source with high adsorption capacity has become a research hotspot in recent years. Summary of the Invention

[0004] In order to solve the problems mentioned in the background art, the purpose of this invention is to provide a high-efficiency composite carbon source for wastewater treatment agents and a method for preparing the same.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A highly efficient composite carbon source for wastewater treatment agents, comprising component A and component B;

[0007] Component A comprises the following raw materials in parts by weight:

[0008] 3-6 parts glucose, 5-10 parts sodium acetate, 1-2 parts pectinase, 20-30 parts fucoidan, 15-25 parts ethylene glycol;

[0009] Component B is made from the following raw materials measured in parts by weight:

[0010] 40-60 parts activated carbon, 2-4.5 parts natural zeolite modifier, 10-20 parts filler, 5-10 parts adhesive, and 3-6 parts polyethylene wax.

[0011] As a further aspect of the present invention, the natural zeolite modifier is prepared by the following method:

[0012] Step 1: Add natural zeolite to an ethanol-water solution and ultrasonically disperse it until a uniform dispersion is formed. Then add a surface functionalizing agent to the dispersion, stir evenly, adjust the pH to 3-4, raise the temperature to 60-70℃, and continue stirring for 6-9 hours. Then stop heating, cool down and discharge the material to obtain functionalized natural zeolite.

[0013] Step 2: Disperse the functionalized natural zeolite in N,N-dimethylformamide, then add the pyridine derivative and catalyst. After the addition is complete, raise the temperature to 70-80℃ and stir for 2-4 hours. Then add the thioclate derivative. After the addition is complete, raise the temperature further to 90-100℃ and stir for 12-18 hours. Then stop heating, cool down and discharge the material to obtain the intermediate material.

[0014] Step 3: Add the intermediate material to a mixed solution of N,N-dimethylformamide and deionized water, stir well, add the reducing agent, stir at room temperature for 3-6 hours, centrifuge to remove the solid material, wash and vacuum dry to obtain the natural zeolite modifier.

[0015] As a further aspect of the present invention, in step one, the surface functionalizing agent is 3-glycidyl etheroxypropyltrimethoxysilane or 3-glycidyl etheroxypropyltriethoxysilane.

[0016] As a further aspect of the present invention, in step two, the catalyst is any one of triphenylphosphine, tetramethylammonium bromide, or tetrabutylammonium bromide.

[0017] As a further aspect of the present invention, in step two, the pyridine derivative is prepared by the following method:

[0018] Dimethylpyridinium chloride and bromosuccinic acid were added to 1,4-dioxane. After the addition was complete, the mixture was stirred until homogeneous. Then, the temperature was raised to 60-70℃ and stirred for 1-2 hours. Then, an acid-binding agent was added. After the addition was complete, the temperature was maintained for 4-8 hours. The solvent was evaporated and the product was collected to obtain the pyridine derivative.

[0019] As a further embodiment of the present invention, the acid-binding agent is triethylamine.

[0020] As a further aspect of the present invention, in step two, the thioclate derivative is prepared by the following method:

[0021] α-Lipoic acid was added to acetone, and nitrogen gas was introduced for protection. The mixture was stirred until homogeneous. Then, a composite catalyst was added. After the addition was complete, the mixture was stirred at room temperature for 20-30 minutes. Then, 1,3-diepoxyglycerol ether was added. After the addition was complete, the mixture was stirred for 3-6 hours. The solvent was evaporated to remove the product, which was then collected and purified to obtain the lipoic acid derivative.

[0022] As a further embodiment of the present invention, the composite catalyst is a mixture of dicyclohexylcarbodiimide and 4-dimethylaminopyridine in a mass ratio of 1:0.2-0.3.

[0023] As a further aspect of the present invention, in step three, the reducing agent is tributylphosphine.

[0024] In the above technical solution, dimethylpyridineamine and bromosuccinic acid are first used as raw materials. The secondary amine groups in their structures can undergo a substitution reaction with halogen substituents under the action of an acid-binding agent to obtain a pyridine derivative containing two equivalent active carboxyl substituents in its structure.

[0025] Next, the carboxyl substituent in the α-lipoic acid structure was activated using a composite catalyst, and then condensed with the hydroxyl substituent in the 1,3-diepoxyglycerol ether glycerol structure at room temperature to obtain a lipoic acid derivative containing two equivalent active epoxy functional groups.

[0026] Then, natural zeolite was epoxy-functionalized using a surface functionalizing agent to obtain functionalized natural zeolite. Next, under the action of a catalyst, the active carboxyl substituents in the pyridine derivative structure could undergo ring-opening esterification with the epoxy groups of the functionalized natural zeolite, and at the same time, could undergo a continuous ring-opening reaction with the epoxy functional groups in the thiooctyl ester derivative structure. This formed an in-situ polymerization on the surface of natural zeolite with the epoxy groups of the functionalized natural zeolite as active initiation sites and the pyridine derivative and thiooctyl ester derivative as polymerizing monomers. This modified natural zeolite surface with a macromolecular modifier having an alternating linkage structure, and an intermediate material was obtained. Finally, by using a reducing agent, the disulfide bonds in the structure of the macromolecular modifier were reduced to mercapto groups to obtain a natural zeolite modifier.

[0027] A method for preparing a high-efficiency composite carbon source for wastewater treatment agents includes the following steps:

[0028] Step 1: Preparation of Component A

[0029] After weighing and preparing all the raw materials, add them to the mixing tank and mechanically stir to mix them evenly to obtain component A;

[0030] Step 2: Preparation of Component B

[0031] Add all raw materials to a mixing vessel, control the rotation speed at 1000-1500 r / min, and mechanically stir to mix evenly. Then pour the resulting mixture into a mold, press it into shape, and transfer it to a sintering furnace. Pour nitrogen gas into the furnace for protection, then heat it to 180-200℃ and calcine it for 2-5 hours. After that, discharge the material, demold it, crush it, and pass it through a 10-20 sieve to obtain a composite carbon source.

[0032] Step 3: Preparation of composite carbon source

[0033] Component A and component B are stirred and mixed to obtain a composite carbon source.

[0034] The beneficial effects of this invention are:

[0035] (1) This invention prepares a modified natural zeolite by modifying the surface of natural zeolite with polymeric macromolecules. On the one hand, the polymeric macromolecules contain abundant thiol functional groups, which can form coordination with heavy metal ions in wastewater upon contact. At the same time, the polymeric macromolecules also contain pyridine dimethylamine structures, which can complex with heavy metal ions in wastewater. The two forces work together to convert heavy metal ions from a free state to a bound state, which is firmly confined to the surface of the carbon source. On the other hand, natural zeolite itself has a rich porous structure similar to polyactivated carbon, which can physically adsorb heavy metal ions in wastewater. This physical adsorption effect can adsorb heavy metal ions around the composite carbon source in a short time, increasing the concentration of heavy metal ions around the composite carbon source. Then, through the active functional groups, chemical adsorption effects such as complexation and coordination are formed on the heavy metal ions, thereby achieving physical-chemical dual adsorption first, and thus making the surface of the prepared composite carbon source exhibit excellent heavy metal ion adsorption capacity.

[0036] (2) The A component configured in this invention is rich in nutrients and can effectively supplement the carbon source required for denitrification in the biochemical system, thereby improving the removal rate of total nitrogen and total phosphorus. When mixed with the B component which uses activated carbon as an adsorbent, it can effectively remove various organic substances in wastewater.

[0037] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Detailed Implementation

[0038] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] The activated carbon used in the following examples and comparative examples is Grade 1 bamboo charcoal from Anhui Xingheng Environmental Protection Technology Co., Ltd., with a fixed carbon content of ≥90.0%; the filler is calcium carbonate; and the binder is a 15% sodium carboxymethyl cellulose aqueous solution.

[0040] Example 1

[0041] A highly efficient composite carbon source for wastewater treatment agents, comprising component A and component B;

[0042] Component A comprises the following raw materials in parts by weight:

[0043] 3 parts glucose, 5 parts sodium acetate, 1 part pectinase, 20 parts fucoidan, and 15 parts ethylene glycol;

[0044] Component B is made from the following raw materials measured in parts by weight:

[0045] 40 parts activated carbon, 2 parts natural zeolite modifier, 10 parts filler, 5 parts adhesive, and 3 parts polyethylene wax.

[0046] The method for preparing the composite carbon source includes the following steps:

[0047] Step 1: Preparation of Component A

[0048] After weighing and preparing all the raw materials, add them to the mixing tank and mechanically stir to mix them evenly to obtain component A;

[0049] Step 2: Preparation of Component B

[0050] Add all raw materials to the mixing vessel, control the speed to 1000 r / min, and mechanically stir to mix evenly. Then pour the resulting mixture into the mold, press it into shape, and then transfer it to the sintering furnace. Pour nitrogen gas into the furnace for protection, then heat it to 180℃, calcine it for 5 hours, discharge it, demold it, crush it, and pass it through 20 sieves to obtain the composite carbon source.

[0051] Step 3: Preparation of composite carbon source

[0052] Component A and component B are stirred and mixed to obtain a composite carbon source.

[0053] The natural zeolite modifier is prepared using the following method:

[0054] Step 1: Add 1.5g of natural zeolite to an ethanol aqueous solution and ultrasonically disperse until a uniform dispersion is formed. Then add 1.2g of 3-glycidyl etheroxypropyltriethoxysilane to the dispersion, stir evenly, adjust the pH to 4, then raise the temperature to 65℃, keep warm and stir for 8 hours, then stop heating, cool down and discharge the material to obtain functionalized natural zeolite.

[0055] Step 2: Disperse 1g of functionalized natural zeolite in N,N-dimethylformamide, then add 1.5g of pyridine derivative and 0.1g of triphenylphosphine. After the addition is complete, raise the temperature to 75℃ and stir for 3 hours. Then add 0.8g of thioclate derivative. After the addition is complete, raise the temperature to 90℃ and stir for 16 hours. Then stop heating, cool down and discharge the material to obtain the intermediate material.

[0056] Step 3: Add 0.6g of intermediate material to a mixed solution of 20mL N,N-dimethylformamide and 0.5mL deionized water, stir well, add 0.1g of tributylphosphine, stir at room temperature for 4h, centrifuge to remove the solid material, wash and vacuum dry to obtain natural zeolite modifier.

[0057] The pyridine derivatives were prepared using the following method:

[0058] 0.8 g of dimethylpyridinium chloride and 0.79 g of bromosuccinic acid were added to 1,4-dioxane. After the addition was complete, the mixture was stirred until homogeneous. Then, the temperature was raised to 65°C and stirred for 1 hour. Next, 0.3 g of triethylamine was added. After the addition was complete, the mixture was kept at this temperature for another 6 hours. The solvent was evaporated to remove the solvent, and the product was collected and purified to obtain the pyridine derivative.

[0059] Thioctyl ester derivatives are prepared using the following method:

[0060] 0.6 g of α-lipoic acid was added to acetone, and nitrogen gas was introduced for protection. The mixture was stirred until homogeneous. Then, 0.2 g of dicyclohexylcarbodiimide and 0.05 g of 4-dimethylaminopyridine were added. After the addition was complete, the mixture was stirred at room temperature for 30 min. Then, 0.59 g of 1,3-diepoxyglycerol ether was added. After the addition was complete, the mixture was stirred for 4 h. The solvent was evaporated to remove the solvent, and the product was collected. After purification, the lipoic acid derivative was obtained.

[0061] Example 2

[0062] A highly efficient composite carbon source for wastewater treatment agents, comprising component A and component B;

[0063] Component A comprises the following raw materials in parts by weight:

[0064] 4 parts glucose, 8 parts sodium acetate, 1.5 parts pectinase, 25 parts fucoidan, and 20 parts ethylene glycol;

[0065] Component B is made from the following raw materials measured in parts by weight:

[0066] 45 parts activated carbon, 4 parts natural zeolite modifier, 15 parts filler, 8 parts adhesive, and 4 parts polyethylene wax.

[0067] The method for preparing the composite carbon source includes the following steps:

[0068] Step 1: Preparation of Component A

[0069] After weighing and preparing all the raw materials, add them to the mixing tank and mechanically stir to mix them evenly to obtain component A;

[0070] Step 2: Preparation of Component B

[0071] Add all raw materials to the mixing vessel, control the rotation speed at 1200 r / min, and mechanically stir to mix evenly. Then pour the resulting mixture into the mold, press it into shape, and then transfer it to the sintering furnace. Pour nitrogen gas into the furnace for protection, then heat it to 190℃, calcine it for 4 hours, discharge it, demold it, crush it, and pass it through 20 sieves to obtain the composite carbon source.

[0072] Step 3: Preparation of composite carbon source

[0073] Component A and component B are stirred and mixed to obtain a composite carbon source.

[0074] The preparation method of the natural zeolite modifier is the same as that in Example 1.

[0075] Example 3

[0076] A highly efficient composite carbon source for wastewater treatment agents, comprising component A and component B;

[0077] Component A comprises the following raw materials in parts by weight:

[0078] 6 parts glucose, 10 parts sodium acetate, 2 parts pectinase, 30 parts fucoidan, and 25 parts ethylene glycol;

[0079] Component B is made from the following raw materials measured in parts by weight:

[0080] 60 parts activated carbon, 4.5 parts natural zeolite modifier, 30 parts filler, 10 parts adhesive, and 6 parts polyethylene wax.

[0081] The method for preparing the composite carbon source includes the following steps:

[0082] Step 1: Preparation of Component A

[0083] After weighing and preparing all the raw materials, add them to the mixing tank and mechanically stir to mix them evenly to obtain component A;

[0084] Step 2: Preparation of Component B

[0085] Add all raw materials to the mixing vessel, control the rotation speed at 1500 r / min, and mechanically stir to mix evenly. Then pour the resulting mixture into the mold, press it into shape, and then transfer it to the sintering furnace. Pour nitrogen gas into the furnace for protection, then heat it to 200℃, calcine it for 2 hours, discharge it, demold it, crush it, and pass it through 20 sieves to obtain the composite carbon source.

[0086] Step 3: Preparation of composite carbon source

[0087] Component A and component B are stirred and mixed to obtain a composite carbon source.

[0088] The preparation method of the natural zeolite modifier is the same as that in Example 1.

[0089] Comparative Example 1

[0090] A highly efficient composite carbon source for wastewater treatment agents, comprising component A and component B;

[0091] Component A comprises the following raw materials in parts by weight:

[0092] 4 parts glucose, 8 parts sodium acetate, 1.5 parts pectinase, 25 parts fucoidan, and 20 parts ethylene glycol;

[0093] Component B is made from the following raw materials measured in parts by weight:

[0094] 45 parts activated carbon, 4 parts natural zeolite, 15 parts filler, 8 parts adhesive, and 4 parts polyethylene wax.

[0095] The method for preparing the composite carbon source includes the following steps:

[0096] Step 1: Preparation of Component A

[0097] After weighing and preparing all the raw materials, add them to the mixing tank and mechanically stir to mix them evenly to obtain component A;

[0098] Step 2: Preparation of Component B

[0099] Add all raw materials to the mixing vessel, control the rotation speed at 1200 r / min, and mechanically stir to mix evenly. Then pour the resulting mixture into the mold, press it into shape, and then transfer it to the sintering furnace. Pour nitrogen gas into the furnace for protection, then heat it to 190℃, calcine it for 4 hours, discharge it, demold it, crush it, and pass it through 20 sieves to obtain the composite carbon source.

[0100] Step 3: Preparation of composite carbon source

[0101] Component A and component B are stirred and mixed to obtain a composite carbon source.

[0102] Comparative Example 2

[0103] A highly efficient composite carbon source for wastewater treatment agents, comprising component A and component B;

[0104] Component A comprises the following raw materials in parts by weight:

[0105] 4 parts glucose, 8 parts sodium acetate, 1.5 parts pectinase, 25 parts fucoidan, and 20 parts ethylene glycol;

[0106] Component B is made from the following raw materials measured in parts by weight:

[0107] 45 parts activated carbon, 15 parts filler, 8 parts adhesive, and 4 parts polyethylene wax.

[0108] The method for preparing the composite carbon source includes the following steps:

[0109] Step 1: Preparation of Component A

[0110] After weighing and preparing all the raw materials, add them to the mixing tank and mechanically stir to mix them evenly to obtain component A;

[0111] Step 2: Preparation of Component B

[0112] Add all raw materials to the mixing vessel, control the rotation speed at 1200 r / min, and mechanically stir to mix evenly. Then pour the resulting mixture into the mold, press it into shape, and then transfer it to the sintering furnace. Pour nitrogen gas into the furnace for protection, then heat it to 190℃, calcine it for 4 hours, discharge it, demold it, crush it, and pass it through 20 sieves to obtain the composite carbon source.

[0113] Step 3: Preparation of composite carbon source

[0114] Component A and component B are stirred and mixed to obtain a composite carbon source.

[0115] Performance testing

[0116] (1) Weigh 0.3g of component B prepared in Examples 1-3 and Comparative Examples 1-2 respectively, add it to a 0.5L solution of lead nitrate with a concentration of 200mg / L, disperse it evenly, transfer it to a shaker, control the shaking frequency at 180rpm, and the adsorption time at 4h. After the adsorption is completed, filter it and use a spectrophotometer to test the Pb content in the filtrate. 2+ Calculate the adsorption capacity based on the concentration of the adsorption capacity.

[0117] (2) Prepare mud and water samples with a total nitrogen concentration of 50 mg / L. Take five groups of 1 L mud and water samples and add 2 g of component A from the example and comparative example to the mud and water samples respectively. Stir at 200 r / min for 4 h and test the total nitrogen removal rate according to standard HJ 636-2012.

[0118] The test results are shown in the table below;

[0119] Table 1 - Test Results

[0120] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Adsorption capacity 182.1 mg / g 182.6 mg / g 182.4 mg / g 139.8 mg / g 115.1 mg / g Total nitrogen removal rate 68.1 68.2 68.1 68.1 68.0

[0121] Analysis of the test results shows that the composite carbon source prepared in the embodiments of the present invention has a high adsorption capacity of heavy metal ions. After replacing the natural zeolite modifier with unmodified natural zeolite, the chemical adsorption effect was lost, resulting in a significant reduction in the adsorption capacity of the composite carbon source.

[0122] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of these embodiments are merely to aid in understanding the method and core ideas of the present invention, including the best mode, and to enable any person skilled in the art to practice the present invention, including manufacturing and using any device or system, and implementing any combined method. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims. The scope of protection of this patent is defined by the claims and may include other embodiments that can be conceived by those skilled in the art. If these other embodiments have structural elements similar to those expressed in the claims, or if they include equivalent structural elements that are not substantially different from those expressed in the claims, then these other embodiments should also be included within the scope of the claims.

[0123] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-efficiency composite carbon source for sewage treatment agent, characterized in that, The A component and the B component are included; The A component includes the following raw materials in parts by weight: Glucose 3-6 parts, sodium acetate 5-10 parts, pectinase 1-2 parts, fucoidan 20-30 parts, ethylene glycol 15-25 parts; The B component is made of the following raw materials in parts by weight: Activated carbon 40-60 parts, natural zeolite modifier 2-4.5 parts, filler 10-20 parts, adhesive material 5-10 parts, polyethylene wax 3-6 parts.

2. The high-efficiency composite carbon source for sewage treatment agent according to claim 1, characterized in that, The natural zeolite modifier is prepared by the following method: Step one, surface modification of natural zeolite using a surface functionalization reagent to obtain functionalized natural zeolite; Step two, in situ polymerization of pyridine derivatives and thioctic ester derivatives on the surface of functionalized natural zeolite under the action of a catalyst in N,N-dimethylformamide as a medium to obtain an intermediate material; Step three, reduction of disulfide bonds in the structure of the intermediate material using a reducing agent to obtain a natural zeolite modifier.

3. The high-efficiency composite carbon source for sewage treatment agent according to claim 2, characterized in that, In step one, the surface functionalization reagent is 3-glycidyloxypropyltrimethoxysilane or 3-glycidyloxypropyltriethoxysilane.

4. The high-efficiency composite carbon source for sewage treatment agent according to claim 2, characterized in that, In step two, the catalyst is any one of triphenylphosphine, tetramethylammonium bromide, or tetrabutylammonium bromide.

5. The high-efficiency composite carbon source for sewage treatment agent according to claim 2, characterized in that, In step two, the pyridine derivative is prepared by reacting dimethylpyridine amine and bromosuccinic acid as raw materials under the action of an acid binding agent.

6. The high-efficiency composite carbon source for sewage treatment agent according to claim 5, characterized in that, The acid binding agent is triethylamine.

7. The high-efficiency composite carbon source for sewage treatment agent according to claim 2, characterized in that, In step two, the thioctic ester derivative is prepared by reacting α-thioctic acid and 1,3-diglycidyl ether glycerol as raw materials under the action of a composite catalyst.

8. The high-efficiency composite carbon source for sewage treatment agent according to claim 7, characterized in that, The composite catalyst is a mixture of dicyclohexyl carbodiimide and 4-dimethylamino pyridine with a mass ratio of 1:0.2-0.

3.

9. The high-efficiency composite carbon source for sewage treatment agent according to claim 2, characterized in that, In step three, the reducing agent is tributylphosphine.

10. A method for preparing the high-efficiency composite carbon source for sewage treatment agent according to claim 1, characterized in that, The method includes the following steps: First step, preparation of the A component After weighing all the raw materials, they are added to a stirred tank, mechanically stirred and mixed uniformly to obtain the A component; Second step, preparation of the B component The raw materials are added to a mixing tank, the rotation speed is controlled at 1000-1500 r / min, mechanically stirred and mixed uniformly, then the formed mixture is poured into a mold, pressed into shape, then transferred to a sintering furnace, nitrogen is introduced for protection, then heated to 180-200℃, calcined for 2-5h, discharged, demolded, crushed, and sieved through a 10-20 sieve to obtain a composite carbon source; Third step, preparation of the composite carbon source The A component and the B component are stirred and mixed to obtain a composite carbon source.