A highly efficient modified activated carbon that enhances the adsorption and purification capacity of various organic gases

Abstract

This application is a divisional application of application number CN202010413545.0, and provides a high-efficiency modified activated carbon that improves the adsorption and purification capacity of various organic gases, including 30-70% modified wood charcoal and 30-70% modified coal charcoal. The modified wood charcoal is prepared with wood powdered charcoal as raw charcoal, polyvinyl alcohol, surfactant, cross-linking agent, modifier and water to form an adhesive. The modified coal charcoal is prepared with coal columnar charcoal as raw charcoal, surfactant, modifier, regulator and water as catalyst. This application improves the adsorption effect of activated carbon, and the adsorption capacity and purification effect are better. It can adsorb different types of harmful gases at the same time, and the adsorption capacity is increased by more than 5 times. In addition, the modified activated carbon of this application has excellent acid and alkali resistance, and can simultaneously adsorb and decompose various harmful substances with different chemical and physical properties. The types of harmful substances adsorbed and decomposed are more, the adsorption and purification capacity is larger, and it does not drop dust during use, and can more comprehensively improve and purify the air quality.

Description

[0001] This application is a divisional application. The original application has the application number 2020104135450, the application date is May 15, 2020, and the invention title is "A highly efficient modified activated carbon capable of adsorbing multiple VOC gases and its preparation method". Technical Field

[0002] This invention relates to the field of activated carbon technology, specifically to a highly efficient modified activated carbon that enhances the adsorption and purification capacity of various organic gases. Background Technology

[0003] Activated carbon is a material with well-developed pores and stable chemical properties. It has a certain adsorption capacity, but it can generally only adsorb substances that match the pore size of the carbon. It is only effective for adsorbing certain types of gases, and the adsorption capacity is very limited. It cannot simultaneously adsorb multiple VOC gases with different physicochemical properties. Summary of the Invention

[0004] The purpose of this invention is to solve the technical problem of limited adsorption capacity of existing activated carbon, and to provide a highly efficient modified activated carbon that can adsorb a variety of VOC gases with a significantly increased adsorption capacity.

[0005] Another objective of this invention is to provide a method for preparing highly efficient modified activated carbon that enhances the adsorption and purification capacity of various organic gases.

[0006] The present invention provides the following technical solution: a highly efficient modified activated carbon that improves the adsorption and purification capacity of various organic gases, comprising, by weight percentage: 30-70% modified wood-based charcoal and 30-70% modified coal-based charcoal;

[0007] The modified wood charcoal has the following raw material weight ratio: 95-105 parts wood powder, 15-22 parts polyvinyl alcohol, 0.5-5 parts surfactant, 0.5-5 parts crosslinking agent, 2-20 parts modifier, and 95-105 parts water.

[0008] The modified coal char has the following raw material weight ratio: 95-105 parts coal columnar char, 0.5-5 parts surfactant, 2-20 parts modifier, 0.5-5 parts regulator, and 95-105 parts water.

[0009] The high-efficiency modified activated carbon of this application comprises 30-70% modified wood charcoal and 30-70% modified coal charcoal. The modified wood charcoal is prepared by using wood powder as the raw material, polyvinyl alcohol, surfactant, crosslinking agent, modifier and water as a binder. The modified coal charcoal uses coal columnar carbon as the raw material and surfactant, modifier, regulator and water as a catalyst. The adhesive for modified charcoal is formulated with polyvinyl alcohol, surfactant, crosslinking agent, modifier, and water. During the formulation process, polyvinyl alcohol, acting as a binder, undergoes a crosslinking reaction when mixed with the crosslinking agent. The original linear structure is cross-linked, transforming into a spatial network structure. The resulting high-molecular-weight crosslinked polymers are difficult to penetrate the pores of activated carbon, thus preventing pore blockage. The addition of the modifier alters the pore size distribution of the activated carbon, increasing the micropore size distribution, which is beneficial for adsorbing gases of different target pore sizes. The addition of the surfactant improves the dispersion of the high-molecular-weight crosslinked polymers, resulting in a more developed pore structure and a larger specific surface area in the prepared modified charcoal. The shaped modified charcoal is more suitable for adsorbing organic gases. The modified charcoal, prepared by mixing the adhesive with wood powder through formulation, mixing, extrusion molding, crushing, and sieving, not only expands the micropore distribution but also reduces the number of blocked pores, resulting in a more developed pore structure and better bonding strength. The developed micropore structure enhances the adsorption performance of various VOC gases. Modifiers added to modified coal-based activated carbon alter the pore size distribution and pore volume, increasing the pore size distribution for adsorption of different targets and providing more residence sites for adsorption. This allows for reaction with harmful gases. Furthermore, the modifiers increase the carboxyl content on the carbon surface, improving the mechanical strength of the coal-based activated carbon. Simultaneously, they remove impurities such as ash from the activated carbon surface, reducing ash content. Surfactants act as catalysts for modification, while regulators provide buffering. The high-efficiency modified activated carbon of this application includes modified wood-based charcoal and modified coal-based charcoal, capable of simultaneously adsorbing various harmful substances with different chemical and physical properties. It adsorbs a wider variety of harmful substances with a greater adsorption capacity. Moreover, the modified activated carbon of this application exhibits excellent acid and alkali resistance, does not shed ash during use, and comprehensively improves air quality.

[0010] Preferably, the wood-based activated carbon powder is produced using the phosphoric acid method, with a mesh size ≥200 mesh, an iodine value ≥1100 mg / g, and a pH value ≥5.6. This wood-based activated carbon powder is specifically designed for waste gas treatment, possessing a well-developed mesoporous structure, large adsorption capacity, and rapid filtration characteristics, thus improving the waste gas treatment rate. The modified wood-based activated carbon of this application uses wood-based activated carbon powder as the raw material, and polyvinyl alcohol as a binder. When mixed with a crosslinking agent, a crosslinking reaction occurs, transforming the original linear structure into a spatial network structure. This forms a high-molecular-weight polymer crosslinker that is difficult to penetrate the pores of the activated carbon. Simultaneously, the high-molecular-weight crosslinker with a spatial network structure not only increases viscosity but also improves acid and alkali resistance, resulting in better adhesion. This prevents the product from reacting with acids or alkalis, thereby improving acid and alkali resistance and preventing ash shedding during use.

[0011] Preferably, the coal-based columnar activated carbon is a coal-based columnar activated carbon with a CTC value ≥ 50%, a particle size of 0.9-9 mm, an iodine value ≥ 800 mg / g, and an ash content ≤ 5%. Coal-based columnar activated carbon is characterized by high strength, well-developed pores, and a large specific surface area, especially a large micropore volume, giving it an extremely strong adsorption capacity for harmful gases in the air. Adding surfactants, modifiers, and regulators to the coal-based columnar activated carbon as catalysts improves its mechanical strength while reducing ash content and increasing adsorption capacity.

[0012] Preferably, the polyvinyl alcohol is one or a combination of PVA1792, PVA1799, PVA2099, PVA2092, PVA2499, and PVA2492. Its function is as an adhesive, capable of undergoing a cross-linking reaction with other components in the adhesive to form a network of cross-linked materials, cross-linking the linear structure of PVA into a network structure, improving acid and alkali resistance, and resulting in uniform pore distribution and size of the activated carbon.

[0013] Preferably, the surfactant is one or a combination of coconut oil and sodium dodecyl sulfonate. Sodium dodecyl sulfonate is an anionic surfactant that acts as a thickener, altering the rheological properties of polyvinyl alcohol and improving its dispersibility and compatibility.

[0014] Preferably, the crosslinking agent is one or a combination of borax and starch. Borax can crosslink with the cis-hydroxyl groups of polyvinyl alcohol, transforming the original linear structure into a network structure. The resulting polymer crosslinked product with a three-dimensional network structure has properties such as shear resistance and acid and alkali resistance, thus increasing viscosity and improving adhesion.

[0015] Preferably, the modifier is one or a combination of several of urea, ammonium chloride, phosphoric acid, sulfuric acid (98%), sodium hydroxide, tetraethylenepentamine, and polyamide. It includes acidic modifiers, basic modifiers, and composite oxidative modifiers. The modifier modifies activated carbon, changing its pore size distribution and pore volume, resulting in a greater target pore size distribution for adsorbing different organic gases, providing more residence sites for adsorption and thus increasing the adsorption capacity. It can react with harmful gases, and the modifier increases the carboxyl group content on the activated carbon surface, improving the mechanical strength of the activated carbon, while simultaneously removing impurities such as ash from the activated carbon surface and reducing the ash content.

[0016] Preferably, the regulator is one or a combination of sodium tripolyphosphate, sodium dihydrogen phosphate, sodium phosphate, sodium monohydrogen phosphate, sodium carbonate, and sodium bicarbonate. It is weakly alkaline and functions to adjust the pH.

[0017] A method for preparing highly efficient modified activated carbon that enhances the adsorption and purification capacity of various organic gases includes the following steps:

[0018] (1) Preparation of modified charcoal:

[0019] a1. Material preparation: Prepare the raw materials for modified charcoal according to the weight ratio, and set them aside;

[0020] a2. Preparation of adhesive: Add polyvinyl alcohol to water and stir evenly. Let stand for 4-6 hours, then stir at high speed for 10-20 minutes. Add surfactant and stir at medium speed for 4-6 minutes. Then add modifier and stir at medium speed for 4-6 minutes. Finally, add crosslinking agent and stir at medium speed for 4-6 minutes.

[0021] a3. Mixing: Add the wood charcoal powder and adhesive to the reactor while stirring. After the mixture is completely added, continue stirring for 0.5-2 hours.

[0022] a4. Granulation and molding: After mixing, the materials are fed into the granulation equipment and extruded into granular charcoal. The granular charcoal is then baked until the moisture content is ≤5%.

[0023] a5. Crushing and sieving: The baked granular charcoal is fed into the crushing equipment for crushing, and then sieved to obtain modified wood charcoal for later use.

[0024] (2) Preparation of modified coal char:

[0025] b1. Material preparation: Prepare the raw materials for modified coal according to the weight ratio, and set them aside;

[0026] b2. Catalyst preparation: Add the modifier and regulator to water and stir evenly. After the solid particles dissolve, let it stand for 4-6 minutes, then add the surfactant and stir evenly.

[0027] b3. Mixing: Add the prepared catalyst to the reactor, and add coal-based columnar carbon while stirring. Stir for 0.5-5 hours.

[0028] b4. Baking: After stirring, bake until the moisture content is ≤5% to obtain modified coal charcoal for later use;

[0029] (3) Mixed components: Mix 30-70% by weight of modified wood charcoal and 30-70% by weight of modified coal charcoal evenly to obtain the final product.

[0030] Preferably, steps a5 and b4 involve baking at 80-150°C for 2-8 hours. Compared to the prior art, this invention has the following advantages:

[0031] This application discloses a highly efficient modified activated carbon for improving the adsorption and purification capacity of various organic gases, comprising 30-70% modified wood-based charcoal and 30-70% modified coal-based charcoal. The modified wood-based charcoal uses wood powder as the raw material, and polyvinyl alcohol, surfactants, crosslinking agents, modifiers, and water are used to prepare an adhesive. The modified coal-based charcoal uses columnar coal-based charcoal as the raw material, and surfactants, modifiers, regulators, and water are used as catalysts. The adhesive for the modified wood-based charcoal is prepared from polyvinyl alcohol, surfactants, crosslinking agents, modifiers, and water. During the preparation of the adhesive, polyvinyl alcohol acts as a binder and reacts with the crosslinking agent during mixing. The cross-linking reaction transforms the original linear structure into a three-dimensional network structure. The resulting high-molecular-weight cross-linked polymers are difficult to penetrate the pores of activated carbon, thus reducing pore blockage. The addition of modifiers alters the pore size distribution of activated carbon, increasing the micropore size distribution, which is beneficial for adsorbing gases of different target pore sizes. The addition of surfactants improves the dispersion of the high-molecular-weight cross-linked polymers, resulting in modified charcoal with a more developed pore structure and a larger specific surface area. The molded modified charcoal is more suitable for adsorbing organic gases. The adhesive and wood powder are then combined... Modified wood-based charcoal, prepared through processes such as binder formulation, mixing, extrusion molding, crushing, and sieving, not only expands the micropore distribution but also reduces the number of blocked pores, resulting in a more developed pore structure and better bonding strength. This developed micropore structure enhances its adsorption capacity for various VOC gases. Modifiers added to modified coal-based charcoal alter the pore size distribution and pore volume, increasing the pore size distribution for adsorption of different target gases, providing more residence sites, and enhancing its ability to react with harmful gases. Furthermore, the modifiers increase the carboxyl content on the charcoal surface, improving the mechanical strength of the coal-based charcoal. Simultaneously, it removes impurities such as ash from the surface of activated carbon, reducing ash content. Surfactants play a catalytic modification role, and regulators are used for buffering and adjustment. The high-efficiency modified activated carbon of this application improves the adsorption effect of activated carbon, with better adsorption capacity and purification effect. It can simultaneously adsorb different types of harmful gases, increasing the adsorption capacity by more than 5 times. Furthermore, the modified activated carbon of this application has excellent acid and alkali resistance, and can simultaneously adsorb and decompose various harmful substances with different chemical and physical properties. It can adsorb and decompose more types of harmful substances, with a larger adsorption capacity, and does not shed ash during use, thus comprehensively improving and purifying air quality.

[0032] This invention discloses a method for preparing highly efficient modified activated carbon that enhances the adsorption and purification capacity of multiple organic gases. The preparation technology is simple, and the modified activated carbon is produced through a special process. The types of activated carbon and their proportions are specified, resulting in highly efficient modified activated carbon that adsorbs more types of harmful substances and has a larger adsorption capacity, thus comprehensively improving air quality. It can simultaneously adsorb multiple harmful substances, combining multiple purification devices into one, which greatly saves social resources. Detailed Implementation

[0033] The specific technical solutions of the present invention are described below with reference to specific embodiments 1 to 4:

[0034] Example 1:

[0035] A method for preparing highly efficient modified activated carbon that enhances the adsorption and purification capacity of various organic gases includes the following steps:

[0036] (1) Preparation of modified charcoal:

[0037] a1. Material preparation: Prepare the raw materials for modified charcoal according to the weight ratio in Table 2, and set them aside;

[0038] a2. Preparation of adhesive: Slowly add polyvinyl alcohol to water while stirring evenly. After it is evenly dissolved, let it stand for 6 hours, then stir at high speed for 10 minutes, add surfactant and stir at medium speed for 4 minutes, then add modifier and stir at medium speed for 4 minutes, and then add crosslinking agent and stir at medium speed for 4 minutes.

[0039] a3. Mixing: Add wood charcoal powder and adhesive to the reactor at a weight ratio of 100:30, stirring while adding. After the mixture is completely added, continue stirring for 1 hour.

[0040] a4. Granulation and molding: After mixing, the materials are fed into the granulation equipment and extruded into granular charcoal. The granular charcoal is then placed in a tray and placed into an oven. It is baked at 150℃ for 2 hours, and the moisture content is checked until the moisture content is ≤5%.

[0041] a5. Crushing and sieving: The baked granular charcoal is fed into the crushing equipment for crushing. After crushing, it is sieved to select charcoal that meets the requirements of particle size and length, and modified wood charcoal is obtained for later use (the above high-speed stirring is 1000r / min, and medium-speed stirring is 500r / min).

[0042] (2) Preparation of modified coal char:

[0043] b1. Material preparation: Prepare the raw materials for modified coal according to the weight ratio in Table 3, and set them aside;

[0044] b2. Catalyst preparation: Add the modifier and regulator to water and stir evenly. After the solid particles dissolve, let stand for 4 minutes, then add the surfactant and stir evenly.

[0045] b3. Mixing: Add the prepared catalyst to the reactor, add coal-based columnar carbon while stirring, and stir together for 5 hours.

[0046] b4. Baking: Place the charcoal on a tray and bake at 80℃ for 8 hours. If the moisture content is ≤5%, the modified coal charcoal is obtained and ready for use.

[0047] (3) Mixed components: Mix 53% by weight of modified wood charcoal and 47% by weight of modified coal charcoal evenly and then vacuum package them to obtain the final product.

[0048] Example 2:

[0049] A method for preparing highly efficient modified activated carbon that enhances the adsorption and purification capacity of various organic gases includes the following steps:

[0050] (1) Preparation of modified charcoal:

[0051] a1. Material preparation: Prepare the raw materials for modified charcoal according to the weight ratio in Table 2, and set them aside;

[0052] a2. Preparation of adhesive: Slowly add polyvinyl alcohol to water while stirring evenly. After it is evenly dissolved, let it stand for 5 hours, then stir at high speed for 20 minutes, add surfactant and stir at medium speed for 5 minutes, then add modifier and stir at medium speed for 5 minutes, and then add crosslinking agent and stir at medium speed for 5 minutes.

[0053] a3. Mixing: Add wood charcoal powder and adhesive to the reactor at a weight ratio of 100:20, stirring while adding. After the mixture is completely added, continue stirring for 1.5 hours.

[0054] a4. Granulation and molding: After mixing, the materials are fed into the granulation equipment and extruded into granular charcoal. The granular charcoal is then placed in a tray and placed into an oven. It is baked at 100℃ for 4 hours, and the moisture content is tested until the moisture content is ≤5%.

[0055] a5. Crushing and sieving: The baked granular charcoal is fed into the crushing equipment for crushing. After crushing, it is sieved to select charcoal that meets the requirements of particle size and length, and modified wood charcoal is obtained for later use (the above high-speed stirring is 8000 r / min, and the medium-speed stirring is 400 r / min).

[0056] (2) Preparation of modified coal char:

[0057] b1. Material preparation: Prepare the raw materials for modified coal according to the weight ratio in Table 3, and set them aside;

[0058] b2. Catalyst preparation: Add the modifier and regulator to water and stir evenly. After the solid particles dissolve, let it stand for 5 minutes, then add the surfactant and stir evenly.

[0059] b3. Mixing: Add the prepared catalyst to the reactor, add coal-based columnar carbon while stirring, and stir together for 0.5 hours.

[0060] b4. Baking: Place the mixture on a tray and bake at 100℃ for 4 hours. If the moisture content is ≤5%, the modified coal charcoal is obtained and ready for use.

[0061] (3) Mixed components: Mix 62% by weight of modified wood charcoal and 38% by weight of modified coal charcoal evenly and then vacuum package them to obtain the final product.

[0062] Example 3:

[0063] A method for preparing highly efficient modified activated carbon that enhances the adsorption and purification capacity of various organic gases includes the following steps:

[0064] (1) Preparation of modified charcoal:

[0065] a1. Material preparation: Prepare the raw materials for modified charcoal according to the weight ratio in Table 2, and set them aside;

[0066] a2. Preparation of adhesive: Slowly add polyvinyl alcohol to water while stirring evenly. After it is evenly dissolved, let it stand for 4 hours, then stir at high speed for 15 minutes, add surfactant and stir at medium speed for 6 minutes, then add modifier and stir at medium speed for 5 minutes, and then add crosslinking agent and stir at medium speed for 6 minutes.

[0067] a3. Mixing: Add wood charcoal powder and adhesive to the reactor at a weight ratio of 100:10, stirring while adding. After the mixture is completely added, continue stirring for 2 hours.

[0068] a4. Granulation and molding: After mixing, the materials are fed into the granulation equipment and extruded into granular charcoal. The granular charcoal is then transferred to an oven in a tray and baked at 80°C for 8 hours. The moisture content is checked until the moisture content is ≤5%.

[0069] a5. Crushing and sieving: The baked granular charcoal is fed into the crushing equipment for crushing. After crushing, it is sieved to select charcoal that meets the requirements of particle size and length, and modified wood charcoal is obtained for later use (the above high-speed stirring is 900 r / min, and the medium-speed stirring is 300 r / min).

[0070] (2) Preparation of modified coal char:

[0071] b1. Material preparation: Prepare the raw materials for modified coal according to the weight ratio in Table 3, and set them aside;

[0072] b2. Catalyst preparation: Add the modifier and regulator to water and stir evenly. After the solid particles dissolve, let stand for 6 minutes, then add the surfactant and stir evenly.

[0073] b3. Mixing: Add the prepared catalyst to the reactor, add coal-based columnar carbon while stirring, and stir together for 4 hours.

[0074] b4. Baking: Place the charcoal on a tray and bake at 80℃ for 8 hours. If the moisture content is ≤5%, the modified coal charcoal is obtained and ready for use.

[0075] (3) Mixed components: Mix 70% by weight of modified wood charcoal and 30% by weight of modified coal charcoal evenly and then vacuum package them to obtain the final product.

[0076] Example 4:

[0077] A method for preparing highly efficient modified activated carbon that enhances the adsorption and purification capacity of various organic gases includes the following steps:

[0078] (1) Preparation of modified charcoal:

[0079] a1. Material preparation: Prepare the raw materials for modified charcoal according to the weight ratio in Table 2, and set them aside;

[0080] a2. Preparation of adhesive: Slowly add polyvinyl alcohol to water while stirring evenly. After it is evenly dissolved, let it stand for 5.5 hours, then stir at high speed for 18 minutes, add surfactant and stir at medium speed for 5 minutes, then add modifier and stir at medium speed for 5 minutes, and then add crosslinking agent and stir at medium speed for 5 minutes.

[0081] a3. Mixing: Add wood charcoal powder and adhesive to the reactor at a weight ratio of 100:1 while stirring. After the mixture is completely added, continue stirring for another 0.5 hours.

[0082] a4. Granulation and molding: After mixing, the mixture is fed into a granulation device and extruded into granular charcoal. The granular charcoal is then placed in a tray and placed into an oven. It is baked at 100℃ for 6 hours, and the moisture content is checked until the moisture content is ≤5%.

[0083] a5. Crushing and sieving: The baked granular charcoal is fed into the crushing equipment for crushing. After crushing, it is sieved to select charcoal that meets the requirements of particle size and length, and modified wood charcoal is obtained for later use (the above high-speed stirring is 1200 r / min, and medium-speed stirring is 500 r / min).

[0084] (2) Preparation of modified coal char:

[0085] b1. Material preparation: Prepare the raw materials for modified coal according to the weight ratio in Table 3, and set them aside;

[0086] b2. Catalyst preparation: Add the modifier and regulator to water and stir evenly. After the solid particles dissolve, let it stand for 5 minutes, then add the surfactant and stir evenly.

[0087] b3. Mixing: Add the prepared catalyst to the reactor, add coal-based columnar carbon while stirring, and stir together for 2 hours.

[0088] b4. Baking: Place the charcoal on a tray and bake at 100℃ for 6 hours. If the moisture content is ≤5%, the modified coal charcoal is obtained and ready for use.

[0089] (3) Mixed components: Mix 30% by weight of modified wood charcoal and 70% by weight of modified coal charcoal evenly and then vacuum package them to obtain the final product.

[0090] Table 1: Weight percentage of modified activated carbon components in Examples 1-4:

[0091] Components Example 1 Example 2 Example 3 Example 4 Modified charcoal 53％ 62％ 70％ 30％ Modified coal 47％ 38％ 30％ 70％

[0092] Table 2: Component ratios of modified charcoal in Examples 1-4:

[0093]

[0094] Table 3: Component ratios of modified coal char in Examples 1-4:

[0095]

[0096] Test experiment:

[0097] 1. Purification capacity test: The CADR values ​​of the solvent recovery high-efficiency wood-based activated carbon prepared in Examples 1 to 4 and a commercially available brand of wood-based activated carbon (comparative example) were tested respectively. Test instrument: laser particle counter. Test environment: temperature: 25±1.5℃, humidity: 40±5%. The test results are shown in Table 4.

[0098] 2. Adsorption Rate: The adsorption rates of the same amounts of solvent recovery high-efficiency wood-based activated carbon prepared in Examples 1-4 and a commercially available brand of wood-based activated carbon (comparative example) were tested under the same conditions. The test results are shown in Table 4. The formula for calculating the activated carbon adsorption rate is: = (W... i -W0) / W0×100%; its W i W0 represents the weight of saturated activated carbon, and W0 represents the initial weight of activated carbon. The test conditions were an airflow of 3000 m³ / h. 3 The organic waste gas components are: toluene, acetone, ethyl acetate, and xylene. Methanol, all analytical grade, is also present. The inlet flow rate is 0.8 m³ / h. 3 / h, the inlet concentration of each component gas is 2000ppm.

[0099] 3. Acid resistance: The solvent recovery high-efficiency wood-based activated carbon prepared in Examples 1-4 and a commercially available brand of wood-based activated carbon (comparative example) were passed into carbon disulfide, and the changes in the experimental samples were observed. The test results are shown in Table 4.

[0100] 4. Alkali resistance: The solvent recovery high-efficiency wood-based activated carbon prepared in Examples 1-4 and a commercially available brand of wood-based activated carbon (comparative example) were passed into ammonia gas, and the changes in the experimental samples were observed. The test results are shown in Table 4.

[0101] Table 4 Test Results:

[0102]

[0103] As can be seen from the test data in Table 4, compared with the comparative example, the adsorption capacity and purification effect of this application are better. It can adsorb different kinds of harmful gases at the same time, and the adsorption capacity is increased by more than 5 times. In addition, this application has good acid and alkali resistance and does not shed dust during use. The high-efficiency modified activated carbon of this application adsorbs more kinds of harmful substances and has a larger adsorption capacity, which can more comprehensively improve air quality.

Claims

1. A modified activated carbon that enhances the adsorption and purification capacity of various organic gases, characterized in that, It includes, by weight percentage: 30-70% modified charcoal and 30-70% modified coal-based charcoal; The modified wood charcoal has the following raw material weight ratio: 95-105 parts wood powder, 15-22 parts polyvinyl alcohol, 0.5-5 parts surfactant, 0.5-5 parts crosslinking agent, 2-20 parts modifier, and 95-105 parts water. The modified coal-based char has the following raw material weight ratio: 95-105 parts coal-based columnar char, 0.5-5 parts surfactant, 2-20 parts modifier, 0.5-5 parts regulator, and 95-105 parts water. The surfactant in the modified charcoal and the modified coal charcoal raw material is one or a combination of coconut oil and sodium dodecyl sulfonate. The modifier in the modified charcoal and the modified coal-based charcoal raw material is one or a combination of urea, ammonium chloride, phosphoric acid, sulfuric acid, sodium hydroxide, tetraethylenepentamine, and polyamide. The regulator is one or a combination of sodium tripolyphosphate, sodium dihydrogen phosphate, sodium phosphate, sodium monohydrogen phosphate, sodium carbonate, and sodium bicarbonate. The method for preparing the modified activated carbon includes the following steps: (1) Preparation of modified charcoal: a1. Material preparation: Prepare the raw materials for modified charcoal according to the weight ratio, and set them aside; a2. Preparation of adhesive: Add polyvinyl alcohol to water and stir evenly. Let stand for 4-6 hours, then stir at high speed for 10-20 minutes. Add surfactant and stir at medium speed for 4-6 minutes. Then add modifier and stir at medium speed for 4-6 minutes. Finally, add crosslinking agent and stir at medium speed for 4-6 minutes. a3. Mixing: Add the wood charcoal powder and adhesive to the reactor while stirring. After the mixture is completely added, continue stirring for 0.5-2 hours. a4. Granulation and molding: After mixing, the materials are fed into granulation equipment and extruded into granular charcoal. The granular charcoal is then baked until the moisture content is ≤5%. a5. Crushing and sieving: The baked granular charcoal is fed into the crushing equipment for crushing, and then sieved to obtain modified wood charcoal for later use. (2) Preparation of modified coal-based char: b1. Material preparation: Prepare the raw materials for modified coal according to the weight ratio, and set them aside; b2. Catalyst preparation: Add the modifier and regulator to water and stir evenly. After the solid particles dissolve, let it stand for 4-6 minutes, then add the surfactant and stir evenly. b3. Mixing: Add the prepared catalyst to the reactor, and add coal-based columnar carbon while stirring. Stir for 0.5-5 hours. b4. Baking: After stirring, bake until the moisture content is ≤5% to obtain modified coal charcoal for later use; (3) Mixed components: Mix 30-70% by weight of modified wood charcoal and 30-70% by weight of modified coal charcoal evenly to obtain the final product.

2. The modified activated carbon for improving the adsorption and purification capacity of multiple organic gases according to claim 1, characterized in that: The polyvinyl alcohol is one or a combination of several of PVA1792, PVA1799, PVA2099, PVA2092, PVA2499, and PVA2492.

3. The modified activated carbon for improving the adsorption and purification capacity of multiple organic gases according to claim 1, characterized in that: The crosslinking agent is one or a combination of borax and starch.

4. The modified activated carbon for improving the adsorption and purification capacity of multiple organic gases according to claim 1, characterized in that: The wood-based activated carbon is a powdered activated carbon produced by the phosphoric acid method with a mesh size ≥200 mesh, an iodine value ≥1100 mg / g, and a pH value ≥5.

6.

5. The modified activated carbon for improving the adsorption and purification capacity of multiple organic gases according to claim 1, characterized in that: The coal-based columnar activated carbon is a coal-based columnar activated carbon with a CTC value ≥ 50%, a particle size of 0.9-9 mm, an iodine value ≥ 800 mg / g, and an ash content ≤ 5%.

6. The modified activated carbon for improving the adsorption and purification capacity of multiple organic gases according to claim 1, characterized in that: Steps a4 and b4 involve baking at 80-150℃ for 2-8 hours.

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