Long-life activated carbon capable of efficiently removing trichloromethane, sintered carbon rod and preparation method and application thereof

Abstract

The invention discloses long-life activated carbon capable of efficiently removing trichloromethane, a sintered carbon rod and a preparation method and application thereof, and belongs to the technical field of water treatment. The technical problem to be solved is to prolong the service life of the sintered carbon rod and improve the trichloromethane removal effect. According to the technical scheme, the long-life sintered carbon rod capable of efficiently removing trichloromethane is characterized in that the specific surface area of activated carbon in the sintered carbon rod is larger than or equal to 950 m < 2 > / g, the pore volume of ultra-micropores accounts for 75% or above of the pore volume of the micropores, and the stacking density of the sintered carbon rod is 0.592-0.623 g / cm < 3 >.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, specifically to a long-life and highly efficient activated carbon for removing chloroform, sintered carbon rods, their preparation methods, and applications. Background Technology

[0002] Activated carbon is a specially treated type of carbon. It is produced by heating organic raw materials such as fruit shells, coal, and wood in the absence of air to reduce non-carbon components. These components then react with gases, causing the surface of the activated carbon to be eroded, creating a highly porous structure. This process is called activation. Because activation is a microscopic process, involving the erosion of numerous molecular carbides and manifesting as point-like erosion, the surface of activated carbon has countless tiny pores. The diameter of these micropores on the surface of activated carbon is mostly between 2-50 nm. Activated carbon has a large surface area, with each gram having a surface area of ​​500-1500 m². 2 Therefore, activated carbon has excellent adsorption capacity.

[0003] Chloroform, with the molecular formula CHCl3, is a colorless, transparent liquid with a characteristic odor and sweet taste. It has a high refractive index, is non-flammable, has a density greater than water, is volatile, and is sensitive to light. When exposed to light, it reacts with oxygen in the air, gradually decomposing to produce highly toxic phosgene (carbonyl chloride) and hydrogen chloride. Chloroform is listed in the list of toxic and hazardous water pollutants.

[0004] Chloroform is a crucial test item in drinking water quality testing. Excessive chloroform levels in drinking water can be harmful to human health; therefore, controlling its concentration is extremely important. However, the adsorption capacity of existing activated carbon for chloroform in drinking water is unstable.

[0005] Sintered carbon rods, a novel type of activated carbon-based adsorbent material, are made by mixing activated carbon powder with a binder, molding, and sintering at high temperatures. Compared to traditional extruded carbon rods, sintered carbon rods have higher porosity, larger adsorption capacity, and superior mechanical strength. They can simultaneously achieve physical interception and adsorption purification, effectively removing harmful substances such as chloroform, odors, and some heavy metals from water. They are widely used in household water purifiers, industrial water treatment, and other applications.

[0006] Relevant patent documents retrieved:

[0007] This document, published in China (CN116688942A) on September 15, 2023, discloses a multifunctional activated carbon rod for purifying micropollutants in drinking water, its preparation method, and its application. It includes activated carbon and other functional materials. The activated carbon is ultrafine-porous activated carbon, with a weight content of 30-80%. The pore size of the ultrafine-porous activated carbon is 0.4-0.7 nm, and the proportion of pores with a pore size of 0.4-0.7 nm is 20% or more. This invention uses abundant ultrafine-porous activated carbon (with a pore size of 0.4-0.7 nm accounting for more than 20%) in combination with other adsorbent materials, and constructs an activated carbon rod with a unique, multidimensional, microporous filtration structure through a sleeve sintering process, achieving multifunctionality and long-life filtration efficiency. The activated carbon rod achieves a filtration efficiency of over 95% for micropollutants in water, including chloroform, chloramine, residual chlorine, lead, and arsenic, and has a lifespan exceeding 5 tons.

[0008] The prior art represented by the aforementioned documents has at least the following unresolved technical problems or defects: Existing sintered carbon rods still have significant shortcomings in chloroform removal applications, the core issue being their short lifespan, which fails to meet the requirements for long-term stable purification. The key reason for the short lifespan of existing sintered carbon rods is that their core performance parameters are not effectively matched with the adsorption characteristics of chloroform. The intrinsic relationship between key parameters such as the microporous characteristics of activated carbon, the density of the sintered carbon rod, and the chloroform removal lifespan has not been clearly understood, and a performance parameter system for sintered carbon rods capable of achieving long-life chloroform removal has not been established. This results in existing products failing to balance adsorption efficiency and lifespan, thus failing to meet the practical needs of long-term stable purification of drinking water. Therefore, developing a sintered carbon rod with clearly defined core characteristics required for long-life chloroform removal has become an urgent technical problem to be solved in this field. Summary of the Invention

[0009] The purpose of this invention is to provide: A long-life and highly efficient sintered carbon rod for removing chloroform, and related technologies, to solve technical problems such as improving the service life of sintered carbon rods and the chloroform removal effect, or a combination thereof.

[0010] Terminology Explanation: Unless otherwise defined, all technical terms used herein have the same meanings as commonly understood by one of ordinary skill in the art to which this subject matter pertains. Unless otherwise stated, all patents, patent inventions, and disclosures cited throughout this document are incorporated herein by reference in their entirety. Where multiple definitions exist for terms herein, the definitions provided in this chapter shall prevail.

[0011] It should be understood that the above brief description and the following detailed description are exemplary and for illustrative purposes only, and do not limit the subject matter of the invention in any way. In this invention, the singular is used in conjunction with the plural unless otherwise specifically stated. It should also be noted that, unless otherwise stated, the use of “or” or “or” means “and / or”. Furthermore, the use of the term “comprising” and other forms such as “including,” “containing,” and “contains” are not limiting.

[0012] The definition of standard chemical terms can be found in the reference "Second Editorial Office of China Standards Press. Compilation of Standards for Activated Carbon [M]. China Standards Press, 2010."

[0013] Unless otherwise stated, conventional methods within the scope of the art, such as the chloroform adsorption test, shall be used. Unless specifically defined, the use of all commercially available products used herein shall employ standard techniques. For example, they may be performed using the manufacturer's instructions for use with the kit, or in accordance with methods known in the art or the description of this invention. The techniques and methods described herein are generally performed according to conventional methods well known in the art, based on the descriptions in the various summary and more specific documents cited and discussed in this specification.

[0014] The terms “optional / arbitrary” or “optionally / arbitrarily” mean that the event or situation described below may or may not occur, including both the occurrence and non-occurrence of the event or situation.

[0015] The term "ultra-high molecular weight polyethylene" used in this article refers to linear polyethylene with a molecular weight of 1.5 million or more.

[0016] The term "micropore" used in this article refers to a pore size ≤ 1 nm.

[0017] The term "micropore" as used in this article refers to a pore size ≤ 2 nm.

[0018] In a first aspect, the present invention provides: a long-life and highly efficient sintered carbon rod for removing chloroform, wherein the raw materials for preparation, by weight percentage, include 20-30% binder, 50-60% 150-200 mesh activated carbon, and 15-25% 400-600 mesh activated carbon; the physical parameters of the activated carbon include: specific surface area ≥950 m² 2 / g, the pore volume ratio of ultramicropores to micropores is over 75%.

[0019] The technical features include: specific surface area, the ratio of the volume of ultra-micropores to that of micropores, the bulk density of sintered carbon rods, the percentage of the volume of ultra-micropores in activated carbon to the total volume of activated carbon, the cumulative pore volume of ultra-micropores in activated carbon, the amount of raw materials used in preparation, and binders.

[0020] Among them, the preferred specific surface area is ≥1000m². 2 / g.

[0021] Among them, the preferred pore volume ratio of ultramicropores to micropores is 75-85%.

[0022] The bulk density of the sintered carbon rods, a key technical feature, is selected from 0.592-0.623 g / cm³. 3 .

[0023] Among them, the percentage of the pore volume of the ultramicropores in the activated carbon to the total pore volume of the activated carbon is selected from: 65% or more.

[0024] Among them, the preferred percentage of the pore volume of the ultramicropores in the activated carbon to the total pore volume of the activated carbon is 65-75%.

[0025] Among them, the cumulative pore volume of the ultramicropores in the activated carbon, a technical characteristic, is selected from: ≥0.28 cm³. 3 / g.

[0026] The raw materials used in the preparation of the technical features are selected from: 25% binder, 55% 150-200 mesh activated carbon, and 20% 400-600 mesh activated carbon.

[0027] The technical feature adhesive is selected from ultra-high molecular weight polyethylene.

[0028] The preferred technical feature adhesive is Celanese 4012 adhesive powder.

[0029] The technical feature of the binder is selected from binders with a particle size of 325-500 mesh.

[0030] Based on further solutions to the technical problems of the present invention, or simultaneous solutions to multiple technical problems, the preferred solution in the technical solution provided in the first aspect of the present invention includes: The first preferred embodiment: a long-life and highly efficient sintered carbon rod for removing chloroform, comprising, by weight percentage, 20-30% binder, 50-60% 150-200 mesh activated carbon, and 15-25% 400-600 mesh activated carbon; the physical parameters of the activated carbon include: specific surface area ≥950 m². 2 / g, the pore volume ratio of ultra-micropores to micropores is over 75%, and the bulk density of the sintered carbon rods is selected from: 0.592-0.623 g / cm³. 3 This technical solution, having already addressed the technical issues of "improving the service life of sintered carbon rods and the removal effect of chloroform," further addresses the technical problem of "improving the service life of sintered carbon rods."

[0031] The second preferred embodiment: A long-life and highly efficient sintered carbon rod for removing chloroform, comprising, by weight percentage, 20-30% binder, 50-60% 150-200 mesh activated carbon, and 15-25% 400-600 mesh activated carbon; the physical parameters of the activated carbon include: specific surface area ≥950 m². 2 / g, the pore volume ratio of ultrafine pores to micropores is over 75%, and the percentage of ultrafine pore volume in activated carbon to the total pore volume of activated carbon is over 65%. This technical solution, based on solving the technical problem of "improving the service life of sintered carbon rods and the trichloromethane removal effect", further solves the technical problem of "improving the service life of sintered carbon rods and the trichloromethane removal effect".

[0032] Secondly, the present invention provides a method for preparing sintered carbon rods, comprising the following steps: mixing a binder, 150-200 mesh activated carbon and 400-600 mesh activated carbon and then sintering them to obtain sintered carbon rods.

[0033] This includes technical features such as sintering temperature and sintering time.

[0034] The sintering temperature for the technical features is selected from 170-240℃.

[0035] The preferred sintering temperature for the technical features is 190-200℃.

[0036] The sintering time for the technical features is selected from 5-70 min.

[0037] The preferred sintering time for the technical features is 60-70 minutes.

[0038] Thirdly, the present invention provides: an activated carbon, wherein the specific surface area of ​​the activated carbon is ≥950 m² / g. 2 / g, the pore volume ratio of ultramicropores to micropores is over 75%.

[0039] These include technical features such as: specific surface area, the ratio of the volume of ultramicropores to that of micropores, the percentage of the volume of ultramicropores in activated carbon to the total volume of activated carbon, and the cumulative pore volume of ultramicropores in activated carbon.

[0040] Among them, the preferred specific surface area is ≥1000m². 2 / g.

[0041] Among them, the preferred pore volume ratio of ultramicropores to micropores is 75-85%.

[0042] Among them, the percentage of the pore volume of the ultramicropores in the activated carbon to the total pore volume of the activated carbon is selected from: 65% or more.

[0043] Among them, the preferred percentage of the pore volume of the ultramicropores in the activated carbon to the total pore volume of the activated carbon is 65-75%.

[0044] Among them, the cumulative pore volume of the ultramicropores in the activated carbon, a technical characteristic, is selected from: ≥0.28 cm³. 3 / g.

[0045] Fourthly, the present invention provides the application of the activated carbon, the sintered carbon rod, or the sintered carbon rod prepared by the preparation method in the preparation of water purification materials or wastewater treatment materials.

[0046] Among them, technical features include the use of water purification materials or sewage treatment materials.

[0047] The technical feature of the water purification material or wastewater treatment material is selected from: for adsorbing chloroform.

[0048] In this invention, Examples 1-2 at least support "an activated carbon, wherein the activated carbon has a specific surface area ≥ 950 m²". 2 The protection range is defined as "the ratio of the volume of ultra-micropores to micropores is 75% or more".

[0049] Technical feature: Specific surface area ≥ 950 m² 2 " / g", referring to the specific surface area of ​​1125.38 m² as explained above and / or the corresponding technical features in Examples 1-2. 2 / g、1122.31m 2 / g and other common characteristics "≥950m" 2 The term " / g" is used to summarize this. Therefore, those skilled in the art can reasonably infer that the technical feature "specific surface area ≥ 950m²" is appropriate. 2 / g", specific surface area ≥950m² 2 The subordinate concept of " / g", "specific surface area ≥950m²" 2 The technical means that are basically equivalent to " / g" and can replace "specific surface area ≥950m²" based on existing technology and conventional technical means and common knowledge. 2 All technical means such as “ / g” should fall within the protection scope of the aforementioned technical solutions. For example, if other technical characteristics remain unchanged, the protection scope should include “specific surface area ≥950m²”. 2 Replace " / g" with "1200m" 2 / g, 1500m 2 / g, etc., are still within the protection scope of the above-mentioned technical solutions.

[0050] The technical feature “the pore volume ratio of ultramicropores to micropores is 75% or more” is derived from the aforementioned explanation and / or the corresponding technical features in Examples 1-2, such as the pore volume ratio of ultramicropores to micropores being 73.82:100 and 81.08:100, through the common feature “73.82-81.08:100”. Therefore, those skilled in the art can reasonably presume that the technical feature "the pore volume ratio of ultramicropores to micropores is 75% or more", the subordinate concept of "the pore volume ratio of ultramicropores to micropores is 75% or more", the technical means that are basically equivalent to "the pore volume ratio of ultramicropores to micropores is 75% or more", and the technical means that can replace "the pore volume ratio of ultramicropores to micropores is 75% or more" based on the existing technical level and conventional technical means and common knowledge should all fall within the protection scope of the above-mentioned technical solution. For example, if other technical features remain unchanged, replacing "the pore volume ratio of ultramicropores to micropores is 75% or more" with 75:100, 85:100, etc., still falls within the protection scope of the above-mentioned technical solution.

[0051] The present invention has at least the following beneficial effects: Compared with existing technologies, the present invention has better technical effects in improving the service life of sintered carbon rods and the removal effect of chloroform.

[0052] According to experimental tests, at 34 12 Taking a 111mm size as an example, this invention increases the service life of sintered carbon rods to over 500L.

[0053] According to experimental tests, the activated carbon of this invention improves the removal efficiency of chloroform by more than 50%. Attached Figure Description

[0054] Figure 1 The static adsorption capacity curves of different powdered activated carbon for chloroform at different time points are shown.

[0055] Figure 2 The graph shows the adsorption lifetime curves of chloroform for different sintered carbon rods at different volumes.

[0056] Figure 3 This is a graph showing the adsorption lifetime of chloroform on the sintered carbon rods of Example 2 at different bulk densities. Detailed Implementation

[0057] The following non-limiting embodiments are intended to enable those skilled in the art to gain a more comprehensive understanding of the present invention, but do not limit the invention in any way. The following content is merely an exemplary description of the scope of protection claimed by the present invention, and those skilled in the art can make various changes and modifications to the present invention based on the disclosed content, and such changes should also fall within the scope of protection claimed by the present invention.

[0058] The present invention will be further described below by way of specific embodiments. Unless otherwise specified, all instruments, devices, equipment, reagents, products, etc., used in the embodiments of the present invention are obtained through conventional commercial means.

[0059] In the following examples, the powdered activated carbon PAC-A was purchased from Jacobi Environmental Materials Technology Co., Ltd., product name: AquaSorb TM HVS; Powdered activated carbon PAC-B was purchased from Jacobi Environmental Materials Technology Co., Ltd., item number: CS 80X200; Powdered activated carbon PAC-C was purchased from Fujian Xinheng Carbon Industry Co., Ltd., item number: XH-S; Powdered activated carbon PAC-D was purchased from Heikabo Purification Materials Co., Ltd., item number: 1040.

[0060] Example 1 The experiment first selected three different powdered activated carbons (PAC-A, PAC-B, and PAC-C) to conduct a static adsorption experiment on chloroform; then, sintered carbon rods (referred to as carbon rod-A, carbon rod-B, and carbon rod-C, respectively) were prepared through a certain sintering process to conduct a dynamic adsorption experiment on chloroform.

[0061] The specific formula for sintered carbon rods is as follows (by weight percentage): 25% Celanese 4012 binder powder (325-500 mesh), 55% powdered activated carbon (150-200 mesh), and 20% powdered activated carbon (400-600 mesh).

[0062] The sintering process of sintered carbon rods is as follows: 150-200 mesh powdered activated carbon, 400-600 mesh powdered activated carbon, and Celanese 4012 adhesive powder are mixed, compressed in molds of different sizes, and then sintered at 190℃ for 70 minutes to produce sintered carbon rods.

[0063] Specifications of sintered carbon rods: 24 10 68.2mm, 28 14.5 148mm, 34 12 111mm, 37 10 150mm, 45 25 202mm.

[0064] Test method: 1. Static adsorption experiment of chloroform on powdered activated carbon: (1) Prepare a 0.3 mg / L chloroform solution (using water as the solvent) in a brown glass bottle.

[0065] (2) Measure 1L of 0.3mg / L chloroform solution with a graduated cylinder, pour it into a brown glass bottle and place it on a magnetic stirrer, and adjust the speed to 350r / min.

[0066] (3) Weigh 0.1g of powdered activated carbon (0.0733g of 150-200 mesh powdered activated carbon and 0.0267g of 400-600 mesh powdered activated carbon) using a balance and put it into the brown glass bottle in step (2).

[0067] (4) Following the steps above, perform static adsorption experiments of chloroform for durations of 1 min, 3 min, 5 min, 10 min, 30 min, 60 min and 90 min respectively. Take an appropriate amount of solution from the brown glass bottle with a syringe, filter it through a 0.22 μm polytetrafluoroethylene filter membrane into a 1.5 mL brown glass test vial, and test the concentration using GC-MS.

[0068] (5) Calculate the trichloromethane removal rate and the adsorption capacity of powdered activated carbon.

[0069] 2. Dynamic adsorption experiment of chloroform on sintered carbon rods: (1) According to the VOC water preparation method recommended in the NSF / ANSI 53-2022 standard document issued by the American National Standards Institute, a 0.3 mg / L chloroform solution (solvent is water) was prepared, with the pH controlled at 7.5±0.5 and the temperature controlled at 20±0.5℃. 200 g of sodium chloride was added for every 1000 L of chloroform solution prepared to simulate the TDS environment of the actual water body.

[0070] (2) The same empty bed contact time (EBCT) is controlled at 2.11s, and the corresponding flushing flow rate is calculated according to the different sintered carbon rod volumes.

[0071] (3) Place the sintered carbon rod in the filter cylinder, adjust the flow rate and start the dynamic adsorption experiment of chloroform. Flushing method: direct flushing.

[0072] (4) Take samples every 100L, and take water samples before and after filtration respectively. Use GC-MS to test the concentration. At the beginning, the chloroform removal rate (absolute removal rate) of the sintered carbon rod is 100%. When the chloroform removal rate drops to below 95%, stop rinsing. Plot the recorded data points into a curve. Find the volume of the chloroform solution filtered when the removal rate is 95%, which is the adsorption life of the sintered carbon rod.

[0073] BET characterization and chloroform adsorption test data of three types of powdered activated carbon, and adsorption lifetime data of sintered carbon rods are shown in Tables 1-3. Figures 1-2 As shown.

[0074] Table 1. BET characterization and chloroform adsorption test data of three types of powdered activated carbon

[0075] Table 2. Adsorption lifespan of sintered carbon rods of different sizes corresponding to three types of powdered activated carbon.

[0076] Table 3 Static adsorption data of three types of powdered activated carbon for chloroform.

[0077] Note: The removal rate may fluctuate due to the volatilization of chloroform.

[0078] As shown in Table 1, the specific surface area of ​​PAC-C is around 1000 (m²). 2 ·g 1 Below that, compared to powdered activated carbons A and B, the particle size is smaller, and the cumulative pore volume of the ultramicropores is only 0.24 (cm³). 3 ·g 1 The ratios of ultramicropores / micropores and ultramicropores / total pore volume are also relatively low, resulting in poor static adsorption capacity for chloroform and poor adsorption lifetime of the same volume of carbon rod. PAC-B has a similar specific surface area to PAC-A, and its cumulative pore volume of ultramicropores also reaches over 0.28. However, the ratios of ultramicropores / micropores and ultramicropores / total pore volume are about 8% lower than PAC-A. Therefore, its static adsorption capacity for chloroform and adsorption lifetime of the carbon rod are also worse than PAC-A. Figure 2 The curves show the changes in the trichloromethane adsorption lifetime of sintered carbon rods prepared from three types of powdered activated carbon at different volumes. Under the same sintering process and EBCT, the volume and lifetime of the sintered carbon rods show a clear linear relationship. As the volume increases, the difference in adsorption lifetime among the three types of carbon rods gradually increases.

[0079] The adsorption effects of different powdered activated carbon on chloroform were subsequently studied, as shown in Table 4.

[0080] Table 4 Static adsorption data of chloroform for four types of powdered activated carbon

[0081] Example 2 The same powdered activated carbon (PAC-D) was selected for the experiment. The only difference from the sintering process in Example 1 was that sintered carbon rods with different bulk densities were prepared by controlling the degree of compression in the mold. The dynamic adsorption experiment of chloroform was carried out, and the goal was to achieve an adsorption life of more than 1400L under the condition of flushing and stopping (flushing for 10 minutes and stopping for 10 minutes).

[0082] Sintered carbon rod preparation process: Sintered carbon rod specifications: 38 13 149mm.

[0083] Sintered carbon rod formula: by weight percentage, 22% Celanese 4012 binder powder (325-500 mesh), 58% carbon powder (100-250 mesh), and 20% carbon powder (200-500 mesh).

[0084] The sintering process of sintered carbon rods is as follows: 150-200 mesh powdered activated carbon, 400-600 mesh powdered activated carbon, and Celanese 4012 adhesive powder are mixed, compressed in a mold of corresponding size, and then sintered at 190℃ for 70 minutes to produce sintered carbon rods. By controlling the degree of compression in the mold, sintered carbon rods with different bulk densities are prepared.

[0085] Dynamic adsorption experiment of chloroform on sintered carbon rods: (1) According to the VOC water preparation method recommended in the NSF / ANSI 53-2022 standard document issued by the American National Standards Institute, a 0.3 mg / L chloroform solution (solvent is water) was prepared, with the pH controlled at 7.5±0.5 and the temperature controlled at 20±0.5℃. 200 g of sodium chloride was added for every 1000 L of chloroform solution prepared to simulate the TDS environment of the actual water body.

[0086] (2) The same empty bed contact time (EBCT) is controlled at 2.77s, and the corresponding flushing flow rate is calculated according to the different sintered carbon rod volumes.

[0087] (3) Place the sintered carbon rod in the filter cylinder, adjust the flow rate and start the dynamic adsorption experiment of chloroform. The flushing method is: flush and stop (flush for 10 minutes, stop for 10 minutes).

[0088] (4) Take samples every 100L, and take water samples before and after filtration respectively. Use GC-MS to test the concentration. At the beginning, the chloroform removal rate (absolute removal rate) of the sintered carbon rod is 100%. When the chloroform removal rate drops to below 95%, stop rinsing. Plot the recorded data points into a curve. Find the volume of the chloroform solution filtered when the removal rate is 95%, which is the adsorption life of the sintered carbon rod.

[0089] The results are shown in Table 5 and Figure 3 As shown.

[0090] Table 5. Chloroform adsorption lifetime of sintered carbon rods at different densities.

[0091] As shown in Table 5 and Figure 3 As shown, under the same powdered activated carbon and sintering process, sintered carbon rods with different bulk densities exhibit significant differences in their adsorption lifetime for chloroform. The adsorption lifetime initially increases and then decreases with increasing density. The density range of sintered carbon rods with an adsorption lifetime exceeding 1450 L is 0.592–0.623 g·cm³. -3 Therefore, it can be inferred that there exists an optimal packing density range within which the adsorption life of sintered carbon rods is optimal.

[0092] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. An activated carbon, characterized in that, The specific surface area of ​​the activated carbon is ≥950m². 2 / g, the pore volume ratio of ultramicropores to micropores is over 75%.

2. The activated carbon according to claim 1, characterized in that, The specific surface area of ​​the activated carbon is ≥950m². 2 / g, and / or the pore volume ratio of the ultramicropores to the micropores is 75-85%; and / or the pore volume of the ultramicropores in the activated carbon accounts for more than 65% of the total pore volume of the activated carbon, preferably 65-75%.

3. The activated carbon according to claim 1, characterized in that, The cumulative pore volume of the ultrafine pores in the activated carbon is ≥0.28 cm³. 3 / g.

4. A sintered carbon rod with a long lifespan and high efficiency for removing chloroform, characterized in that, The raw materials for preparation, by weight percentage, include 20-30% binder, 50-60% 150-200 mesh activated carbon, and 15-25% 400-600 mesh activated carbon; the activated carbon is the activated carbon described in any one of claims 1-3.

5. The sintered carbon rod according to claim 4, characterized in that, The bulk density of the sintered carbon rod is 0.592-0.623 g / cm³. 3 .

6. The sintered carbon rod according to claim 4, characterized in that, The raw materials for preparing the sintered carbon rod, by weight percentage, include 25% binder, 55% 150-200 mesh activated carbon, and 20% 400-600 mesh activated carbon.

7. The sintered carbon rod according to claim 4, characterized in that, The binder comprises ultra-high molecular weight polyethylene, preferably Celanese 4012 adhesive powder; and / or the particle size of the binder is 325-500 mesh.

8. A method for preparing a sintered carbon rod according to any one of claims 4-7, characterized in that, Includes the following steps: The binder, 150-200 mesh activated carbon and 400-600 mesh activated carbon are mixed and then sintered to obtain sintered carbon rods.

9. The preparation method according to claim 8, characterized in that, The sintering temperature is 170-240℃ and the time is 5-70 min, preferably 190-200℃ and the time is 60-70 min.

10. The application of activated carbon according to any one of claims 1-3, or sintered carbon rod according to any one of claims 4-7, or sintered carbon rod prepared by any one of claims 8-9 in the preparation of water purification materials or wastewater treatment materials; preferably, the water purification material or wastewater treatment material is used to adsorb chloroform.

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