A high-capacity coconut shell activated carbon adsorbent

Abstract

This invention belongs to the field of functional adsorbent technology, specifically relating to a high-capacity coconut shell activated carbon adsorbent and its preparation method. The adsorbent comprises the following raw materials by weight: 80-90 parts coconut shell activated carbon, 5-15 parts mesoporous composite material, 1-6 parts aromatic donor, 0.3-1.2 parts sodium nitrite, and 1 part acidifier. The mesoporous composite material has both mesoporous mass transfer channels and polar trapping functions, which can improve the diffusion conditions of organic molecules and enhance the adsorption driving force for polar components such as aldehydes and ketones. The adsorbent has a high adsorption capacity and bed utilization efficiency for multi-component organic matter in petrochemical plant gas at normal temperature and pressure, and is suitable for the efficient adsorption and recovery of organic matter.

Description

Technical Field

[0001] This invention belongs to the field of functional adsorption materials technology, specifically relating to a high-capacity coconut shell activated carbon adsorbent and its preparation method. Background Technology

[0002] In petrochemical and related industrial production processes, the operation of equipment and the storage and transportation of materials generate equipment gases containing various organic components. These gases typically include benzene compounds, olefins, and volatile organic compounds such as aldehydes and ketones. To meet environmental emission requirements and achieve organic matter recovery, adsorption methods are widely used due to their mature technology and mild operating conditions. Among these, coconut shell-based granular activated carbon, with its high specific surface area, well-developed microporous structure, and good mechanical strength, has become one of the most commonly used adsorption materials in the industrial field. However, the adsorption mechanism of existing coconut shell-based activated carbon mainly relies on the physical adsorption of organic molecules by a single microporous structure. Under the ambient temperature and pressure conditions of actual petrochemical equipment gases, it is easily affected by mass transfer resistance and multi-component competitive adsorption, resulting in premature bed penetration and low effective adsorption capacity. At the same time, its surface functional group types are limited, resulting in insufficient driving force for the adsorption of polar organic compounds such as aldehydes and ketones. In humid environments, water vapor competition further reduces adsorption efficiency. While existing technologies attempt to improve adsorption performance by increasing specific surface area or through simple chemical modification, capacity enhancement is limited under dynamic adsorption conditions, and the stability and engineering applicability of the modifications remain insufficient.

[0003] Therefore, there is an urgent need to develop a new type of adsorption material that, while maintaining the adsorption advantages of coconut shell carbon, breaks through the limitations of the traditional single microporous adsorption mode through reasonable structural and interface design, and synergistically improves mass transfer efficiency and adsorption driving force of multi-component organic matter, so as to meet the application requirements of efficient adsorption and recovery under actual working conditions. Summary of the Invention

[0004] To address the above issues, this invention provides a high-capacity coconut shell activated carbon adsorbent and its preparation method. The novel adsorbent is mainly used to solve problems such as insufficient adsorption capacity, limited dynamic bed mass transfer, and weak adsorption driving force for polar components in the adsorption and recovery of multi-component organic matter in petrochemical plant gas under normal temperature and pressure conditions. It breaks through the limitations of the traditional single microporous adsorption mode of coconut shell activated carbon and significantly improves the effective capacity and adaptability of the adsorbent under actual working conditions.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] This invention provides a high-capacity coconut shell activated carbon adsorbent, which comprises the following raw materials in parts by weight: 80-90 parts coconut shell carbon, 5-15 parts mesoporous composite material, 1-6 parts aromatic donor, 0.3-1.2 parts sodium nitrite, and 1 part acidifier.

[0007] Furthermore, the aromatic donor is selected from any one of p-aminobenzenesulfonic acid, p-aminotoluene, and p-aminophenylacetic acid.

[0008] Furthermore, the acidic agent is selected from any one of acetic acid, citric acid, and sodium dihydrogen phosphate.

[0009] Furthermore, the mesoporous composite material comprises the following raw materials: chloromethylstyrene, divinylbenzene, ferric chloride, 1-methylimidazole, 1,3-propanesulfonyl lactone, and an initiator.

[0010] Furthermore, the mass ratio of chloromethylstyrene, divinylbenzene, ferric chloride, 1-methylimidazole, 1,3-propanesulfonyl lactone and the initiator is 42:18:6:8:7:1.

[0011] Furthermore, the initiator is selected from AIBN (azobisisobutyronitrile) or BPO (benzoyl peroxide).

[0012] Furthermore, the preparation method of the mesoporous composite material is as follows:

[0013] S1: Chloromethylstyrene and divinylbenzene are added to an organic solvent and mixed. Then an initiator is added and a free radical polymerization reaction is carried out under a nitrogen atmosphere to generate cross-linked particles with high mechanical strength and a large number of benzyl chloride active sites. This provides reaction sites for subsequent hypercrosslinking to generate pore structures and introduce functional groups, resulting in a polymer particle suspension.

[0014] S2: Add ferric chloride to the polymer particle suspension, heat and stir to carry out Friedel-Crafts reaction. Under the catalysis of ferric chloride, the benzyl chloride site forms a -CH2-bridged structure with the aromatic ring in the polymer particle, which further crosslinks and promotes the formation of mesoporous structure in the polymer particle. Filter and collect the precipitate to obtain active mesoporous particles.

[0015] S3: Active mesoporous particles are co-dispersed with 1-methylimidazole and 1,3-propanesulfonyl lactone in DMF (N,N-dimethylformamide) to form sulfobetaine zwitterionic groups, which have stronger dipole / hydrogen bond interactions with aldehydes / ketones and reduce the competitive interference of water vapor on adsorption sites, thus obtaining a composite material. The composite material is then washed, dried, and pulverized to obtain a mesoporous composite material.

[0016] This invention also provides a method for preparing a high-capacity coconut shell activated carbon adsorbent, the specific steps of which are as follows:

[0017] Step 1: Mix coconut shell charcoal and mesoporous composite material to promote the adhesion and distribution of mesoporous composite material powder on the surface and pores of coconut shell charcoal particles, and obtain compound particles.

[0018] Step 2: Under ice bath conditions, the aromatic donor and sodium nitrite are dissolved together, and an acidifying agent is added to adjust the pH to acidic, forming a highly reactive diazonium salt intermediate, which provides conditions for subsequent binding with the surface of coconut shell carbon in the compound particles, thus obtaining a diazonium salt solution.

[0019] Step 3: Add the compounded granules to the diazonium salt solution, stir and disperse in an ice bath for 30 min, then heat to 30℃ and continue the reaction for 4 h to obtain the reaction solution. Filter the reaction solution, collect the precipitate and wash and dry it to obtain a high-capacity coconut shell activated carbon adsorbent.

[0020] The beneficial effects achieved by this invention are as follows:

[0021] The high-capacity coconut shell activated carbon adsorbent prepared in this invention uses coconut shell carbon as the main adsorption framework, possessing a high specific surface area and abundant micropore volume. It adsorbs a large amount of multi-component volatile organic compounds in petrochemical plant gas. The self-synthesized mesoporous composite material provides a low-resistance diffusion channel and a long-lasting adsorption interface for the adsorption process through a mesoporous network constructed by hypercrosslinking. Under fixed-bed dynamic conditions, it significantly shortens the diffusion path of organic molecules from the gas phase to the micropore interior, improving the utilization rate of micropore capacity, thereby overcoming the problems of insufficient pore space utilization and insufficient adsorption capacity of traditional coconut shell carbon in dynamic adsorption. At the same time, the zwitterionic groups of sulfobetaine introduced on the surface of the mesoporous composite material can provide stronger dipole-dipole and hydrogen bond interactions for oxygen-containing organic compounds such as aldehydes / ketones, improving the adsorption capacity under normal or low pressure, and reducing the competitive interference of water vapor on effective sites, making its adsorption capacity stable under high humidity conditions. In addition, the diazonium salt intermediate generated by the aromatic donor under the action of sodium nitrite and acidifier further improves the affinity for organic compounds containing aromatic and olefin structures.

[0022] The multi-scale, multi-site, highly active, and high-capacity activated carbon adsorbent provided in this solution significantly improves the adsorption capacity and bed utilization efficiency of organic matter in petrochemical plant gas at ambient temperature and pressure compared with traditional adsorption materials. It also features recyclability and reusability, and has good applicability and application value. Attached Figure Description

[0023] Figure 1 The adsorption isotherm results are for the high-capacity coconut shell activated carbon adsorbent prepared in Example 6.

[0024] Figure 2 The specific surface area and total pore volume of the high-capacity coconut shell activated carbon adsorbent and coconut shell carbon prepared in Examples 4, 6, Comparative Examples 1-2, and the blank group are measured.

[0025] Figure 3 The microstructure characterization results of the high-capacity coconut shell activated carbon adsorbent and coconut shell carbon prepared in Example 6 are shown.

[0026] Figure 4 The results show the adsorption capacity of the high-capacity coconut shell activated carbon adsorbent and coconut shell carbon prepared in Comparative Example 1 and Example 6. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those familiar to those skilled in the art. Furthermore, any methods and materials similar to or equivalent to those described herein may be applied to this invention. The preferred embodiments and materials described herein are for illustrative purposes only and do not limit the scope of this application.

[0029] Unless otherwise specified, all methods described in the following examples are conventional. Unless otherwise specified, all materials used in the following examples are new materials purchased from the market. The coconut shell charcoal used has a particle size of 8-30 mesh (0.595-2.36 mm), an iodine value of 800 mg / g, and a specific surface area of ​​844 m². 2 / g, bulk density 550 g / L; the ferric chloride used is anhydrous ferric chloride.

[0030] Example 1: This example provides a mesoporous composite material, which comprises the following raw materials in parts by weight: 42 parts of chloromethylstyrene, 18 parts of divinylbenzene, 6 parts of ferric chloride, 8 parts of 1-methylimidazole, 7 parts of 1,3-propanesulfonyl lactone, and 1 part of AIBN.

[0031] The preparation method of the mesoporous composite material is as follows:

[0032] S1: Add 42 parts of chloromethylstyrene and 18 parts of divinylbenzene to 180 parts of cyclohexane and mix well. Then add 1 part of AIBN and carry out free radical polymerization under nitrogen atmosphere, 70°C oil bath, and 400 rpm for 30 min to obtain polymer particle suspension.

[0033] S2: Add 6 parts of ferric chloride to the polymer particle suspension, stir at 70℃ and 400 rpm for 6 h to further crosslink, collect the precipitate by vacuum filtration, wash the precipitate with anhydrous ethanol and deionized water in sequence, and dry to obtain active mesoporous particles.

[0034] S3: Active mesoporous particles, 8 parts of 1-methylimidazolium and 7 parts of 1,3-propanesulfonyl lactone were dispersed in 250 parts of DMF and stirred at 500 rpm for 8 h to form zwitterionic groups of sulfobetaine. After the reaction was completed, the solid was collected by filtration to obtain the composite material. The composite material was washed with anhydrous ethanol and deionized water, dried, ground and pulverized, and passed through a 200-mesh sieve to obtain the mesoporous composite material.

[0035] Example 2: This example provides a mesoporous composite material, which comprises the following raw materials in parts by weight: 42 parts of chloromethylstyrene, 18 parts of divinylbenzene, 6 parts of ferric chloride, 8 parts of 1-methylimidazole, 7 parts of 1,3-propanesulfonyl lactone, and 1 part of BPO.

[0036] The preparation method of the mesoporous composite material is as follows:

[0037] S1: 42 parts of chloromethylstyrene and 18 parts of divinylbenzene were added to 180 parts of ethyl acetate and mixed well. Then, 1 part of BPO was added to the mixture. The mixture was heated under nitrogen atmosphere, refluxed in an oil bath at 70°C, and stirred at 400 rpm for 30 min to carry out free radical polymerization to obtain a polymer particle suspension.

[0038] S2: Add 6 parts of ferric chloride to the polymer particle suspension, stir at 70℃ and 400 rpm for 6 h to further crosslink, collect the precipitate by vacuum filtration, wash the precipitate with anhydrous ethanol and deionized water in sequence, and dry to obtain active mesoporous particles.

[0039] S3: Active mesoporous particles, 8 parts of 1-methylimidazolium and 7 parts of 1,3-propanesulfonyl lactone were dispersed in 250 parts of DMF and stirred at 500 rpm for 8 h to form zwitterionic groups of sulfobetaine. After the reaction was completed, the solid was collected by filtration to obtain the composite material. The composite material was washed with anhydrous ethanol and deionized water, dried, ground and pulverized, and passed through a 200-mesh sieve to obtain the mesoporous composite material.

[0040] Example 3: This example provides a high-capacity coconut shell activated carbon adsorbent, which comprises the following raw materials in parts by weight: 80 parts coconut shell carbon, 15 parts mesoporous composite material, 3 parts p-aminobenzenesulfonic acid, 1 part sodium nitrite, and 1 part acetic acid.

[0041] The composition and preparation method of the mesoporous composite material are described in Example 2.

[0042] This embodiment also provides a method for preparing a high-capacity coconut shell activated carbon adsorbent, the specific steps of which are as follows:

[0043] Step 1: Add 80 parts of coconut shell charcoal and 15 parts of mesoporous composite material to a drum mixer and mix at 20 rpm for 25 min to obtain compound granules;

[0044] Step 2: Under ice bath conditions, dissolve 3 parts of p-aminobenzenesulfonic acid and 1 part of sodium nitrite in 120 parts of deionized water, then add 1 part of acetic acid to adjust the pH to acidic, pH 3.46, and continue the reaction for 15 min to form a highly reactive diazonium salt intermediate, thus obtaining a diazonium salt solution.

[0045] Step 3: Add the compounded particles to the diazonium salt solution, stir and disperse at 200 rpm for 30 min in an ice bath, then heat to 30℃ and continue the reaction for 4 h to obtain the reaction solution. Filter the reaction solution, collect the precipitate and wash it with deionized water and anhydrous ethanol in sequence, and dry it to obtain a high-capacity coconut shell activated carbon adsorbent.

[0046] Example 4: This example provides a high-capacity coconut shell activated carbon adsorbent, which comprises the following raw materials in parts by weight: 82.7 parts coconut shell carbon, 10 parts mesoporous composite material, 6 parts p-aminotoluene, 0.3 parts sodium nitrite, and 1 part citric acid.

[0047] The composition and preparation method of the mesoporous composite material are described in Example 2.

[0048] This embodiment also provides a method for preparing a high-capacity coconut shell activated carbon adsorbent, the specific steps of which are as follows:

[0049] Step 1: Take 82.7 parts of coconut shell charcoal and 10 parts of mesoporous composite material and add them to a drum mixer. Mix at 20 rpm for 25 min to obtain compound granules.

[0050] Step 2: Under ice bath conditions, dissolve 6 parts of p-aminotoluene and 0.3 parts of sodium nitrite together in 120 parts of 50% ethanol aqueous solution, then add 1 part of citric acid to adjust the pH to acidic, pH 2.92, and continue the reaction for 20 min to obtain a diazonium salt solution.

[0051] Step 3: Add the compounded particles to the diazonium salt solution, stir and disperse at 200 rpm for 30 min in an ice bath, then heat to 30℃ and continue the reaction for 4 h to obtain the reaction solution. Filter the reaction solution, collect the precipitate and wash it with deionized water and anhydrous ethanol in sequence, and dry it to obtain a high-capacity coconut shell activated carbon adsorbent.

[0052] Example 5: This example provides a high-capacity coconut shell activated carbon adsorbent, which comprises the following raw materials in parts by weight: 90 parts coconut shell carbon, 5 parts mesoporous composite material, 1 part p-aminophenylacetic acid, 1.2 parts sodium nitrite and 1 part sodium dihydrogen phosphate.

[0053] The composition and preparation method of the mesoporous composite material are described in Example 1.

[0054] This embodiment also provides a method for preparing a high-capacity coconut shell activated carbon adsorbent, the specific steps of which are as follows:

[0055] Step 1: Take 90 parts of coconut shell charcoal and 5 parts of mesoporous composite material and add them to a drum mixer. Mix at 20 rpm for 30 min to obtain compound granules.

[0056] Step 2: Under ice bath conditions, dissolve 1 part of p-aminophenylacetic acid and 1.2 parts of sodium nitrite together in 120 parts of deionized water, then add 1 part of sodium dihydrogen phosphate, adjust the pH to acidic (pH 4.05), and continue the reaction for 15 min to obtain a diazonium salt solution.

[0057] Step 3: Add the compounded granules to the diazonium salt solution, stir and disperse at 200 rpm for 30 min in an ice bath, then heat to 30℃ and continue the reaction for 4 h to obtain the reaction solution. Filter the reaction solution, collect the precipitate, wash and dry it with deionized water to obtain a high-capacity coconut shell activated carbon adsorbent.

[0058] Example 6: This example provides a high-capacity coconut shell activated carbon adsorbent, which comprises the following raw materials in parts by weight: 82 parts coconut shell carbon, 8 parts mesoporous composite material, 3.2 parts p-aminobenzenesulfonic acid, 0.8 parts sodium nitrite, and 1 part citric acid.

[0059] The composition and preparation method of the mesoporous composite material are described in Example 1.

[0060] This embodiment also provides a method for preparing a high-capacity coconut shell activated carbon adsorbent, the specific steps of which are as follows:

[0061] Step 1: Add 82 parts of coconut shell charcoal and 8 parts of mesoporous composite material to a drum mixer and mix at 20 rpm for 20 min to obtain compound granules;

[0062] Step 2: Under ice bath conditions, dissolve 3.2 parts of p-aminobenzenesulfonic acid and 0.8 parts of sodium nitrite together in 120 parts of deionized water, then add 1 part of citric acid to adjust the pH to acidic, pH 2.68, and continue the reaction for 15 min to obtain a diazonium salt solution.

[0063] Step 3: Add the compounded granules to the diazonium salt solution, stir and disperse at 200 rpm for 30 min in an ice bath, then heat to 30℃ and continue the reaction for 4 h to obtain the reaction solution. Filter the reaction solution, collect the precipitate, wash and dry it with deionized water to obtain a high-capacity coconut shell activated carbon adsorbent.

[0064] The difference between Comparative Example 1 and Example 6 is that no mesoporous composite material was added; the rest is the same as Example 6.

[0065] The difference between Comparative Example 2 and Example 6 is that no p-aminobenzenesulfonic acid was added for modification; the rest is the same as Example 6.

[0066] Pore ​​structure characterization: 0.200 g of the adsorbents prepared in Examples 4, 6, and Comparative Examples 1-2 were taken as test samples and placed in a degassing station at 120℃ for 4 h under vacuum. The samples were then transferred to sealed sample tubes, with unmodified coconut shell carbon used as a blank control. Surface area and pore size were analyzed using a Micromeritics ASAP 2460 analyzer. The tests were conducted in a 77 K liquid nitrogen environment, and N2 adsorption-desorption isotherms were collected. The P / P0 range was set to 0.01–0.99. The adsorption isotherm results for the adsorbent prepared in Example 6 are shown below. Figure 1 Specific surface area was calculated using the BET method, micropore capacity was calculated using the t-plot method, and total pore volume was converted from the adsorption capacity at P / P0=0.99. After the test, the specific surface area and total pore volume data were recorded, and the results are shown below. Figure 2 .

[0067] Morphology examination: Unmodified coconut shell charcoal and activated carbon adsorbent prepared in Example 6 were immobilized on conductive adhesive and sputtered with gold in a sputtering instrument. The film thickness was set to 10 nm to improve conductivity and reduce charging effect. Observation was performed using a Hitachi SU8010 scanning electron microscope with an accelerating voltage of 5 kV and a working distance of 8 mm. Surface morphology images were acquired, and the results are shown below. Figure 3 .

[0068] Adsorption capacity assessment: The adsorption equilibrium capacity was verified using the closed-bottle static method. Unmodified coconut shell charcoal, the adsorbent samples prepared in Example 6 and Comparative Example 1 were vacuum dried at 80℃ for 6 h and then cooled. Unmodified coconut shell charcoal served as a blank. 0.200 g of each sample was weighed and placed into 250 mL headspace vials, which were immediately sealed. Standard solutions of 300 ppm benzene and 300 ppm acetone were injected into the headspace vials to form the target initial concentration. The vials were then equilibrated at 150 rpm for 12 h in a constant-temperature shaker at 25℃. After equilibration, headspace gas was injected, and quantification was performed using gas chromatography with an FID detector. The chromatographic column was HP-5 (30 m × 0.32 mm × 0.25 μm), the injection port was 250℃, the column temperature program was 40℃ for 2 min, then increased to 200℃ at 10℃ / min and held for 5 min, with nitrogen as the carrier gas at 1.0 mL / min. The adsorption capacity per unit mass (mg / g) was calculated based on the concentration difference before and after equilibration. The results are shown in [Figure number missing]. Figure 4 .

[0069] Figure 1The results showed that the adsorption isotherm measured by the adsorbent prepared in Example 6 was a composite Type I isotherm characterized by microporous (pore size < 2 nm) gas adsorption properties, indicating that it has a rich microporous structure. Furthermore, the presence of hysteresis loops in the P / P0 range of 0.5-0.99 indicates that the mesoporous and macroporous structures of the coconut shell charcoal itself still exist, with a specific surface area of ​​1545 m². 2 / g.

[0070] Figure 2 The results showed that the activated carbon adsorbent prepared in Example 6 had a high specific surface area and total pore capacity, indicating that the adsorbent prepared in this scheme has high capacity and high adsorption potential.

[0071] Figure 3 The results showed that the surface and pore cavities of the activated carbon adsorbent prepared in Example 6 were covered with dense particulate matter, indicating that the modification of coconut shell carbon by mesoporous composite materials and aromatic donors was successful and had a significant effect on improving the specific surface area of ​​the adsorbent.

[0072] Figure 4 The results showed that the blank group of coconut shell activated carbon had limited adsorption capacity for polar acetone and benzene. The adsorbent prepared in Comparative Example 1 mainly relied on p-aminobenzenesulfonic acid to modify the coconut shell activated carbon to improve adsorption capacity, which was improved. The high-capacity coconut shell activated carbon adsorbent prepared in Example 6 had a high specific surface area and abundant polar and unsaturated bond adsorption sites, revealing its high-activity adsorption performance for volatile organic compounds in petrochemical plant gas.

[0073] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

[0074] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention. The actual application is not limited to this. In conclusion, if those skilled in the art are inspired by this description and design similar methods and embodiments without departing from the spirit of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A high-capacity coconut shell activated carbon adsorbent, characterized in that, The coconut shell activated carbon adsorbent comprises the following raw materials in parts by weight: 80-90 parts coconut shell carbon, 5-15 parts mesoporous composite material, 1-6 parts aromatic donor, 0.3-1.2 parts sodium nitrite, and 1 part acidifier; The aromatic donor is selected from any one of p-aminobenzenesulfonic acid, p-aminotoluene, and p-aminophenylacetic acid; The mesoporous composite material comprises the following raw materials: chloromethylstyrene, divinylbenzene, ferric chloride, 1-methylimidazole, 1,3-propanesulfonyl lactone, and an initiator. The preparation method of the mesoporous composite material is as follows: S1: Chloromethylstyrene, divinylbenzene and an initiator are reacted to obtain a polymer particle suspension; S2: Add ferric chloride to the polymer particle suspension to carry out a cross-linking reaction, filter and collect the precipitate to obtain active mesoporous particles; S3: Active mesoporous particles are co-dispersed with 1-methylimidazole and 1,3-propanesulfonyl lactone to obtain a composite material. The composite material is then washed, dried, and pulverized to obtain a mesoporous composite material. The specific steps for preparing the coconut shell activated carbon adsorbent are as follows: Step 1: Mix coconut shell charcoal and mesoporous composite material to obtain compound granules; Step 2: Dissolve the aromatic donor and sodium nitrite together, then add an acidic agent to obtain a diazonium salt solution; Step 3: Add the compounded granules to the diazonium salt solution to react and obtain the reaction solution. Filter the reaction solution, collect the precipitate, wash and dry it to obtain a high-capacity coconut shell activated carbon adsorbent.

2. The high-capacity coconut shell activated carbon adsorbent according to claim 1, characterized in that, The mass ratio of chloromethylstyrene, divinylbenzene, ferric chloride, 1-methylimidazole, 1,3-propanesulfonyl lactone and the initiator is 42:18:6:8:7:

1.

3. The high-capacity coconut shell activated carbon adsorbent according to claim 2, characterized in that, The initiator is selected from AIBN or BPO.

4. The high-capacity coconut shell activated carbon adsorbent according to claim 1, characterized in that, The acidic agent is selected from any one of acetic acid, citric acid, and sodium dihydrogen phosphate.

Images