Modification method and modification equipment of composite activated carbon fiber filter material and filter material

Abstract

The invention relates to the technical field of activated carbon fiber modification, in particular to a modification method and modification equipment of a composite activated carbon fiber filter material and the filter material, and aims to overcome the defects of activated carbon modification in the prior art. According to the technical scheme, the modification method of the composite activated carbon fiber filter material comprises three modification operations of activation pretreatment, grafting reaction, dynamic condensation, metal loading and the like, activated carbon fibers are modified, the efficient adsorbability of the activated carbon fibers is improved, and directional fixation and catalytic decomposition operation of formaldehyde are achieved; the filter material prepared from the activated carbon fiber has upper and lower layers which are subjected to water-blocking treatment and load-particle balls are added, so that the composite function of the filter material is realized; the modification equipment for the activated carbon fiber filter material comprises a mounting bracket, a dipping box body and a dipping roller, the dipping roller is connected with a medicament conveying part and is matched with a liquid medicine circulating part to complete activated carbon fiber modification dipping operation, the applicability is high, the dipping effect is good, and subsequent dehydration operation is also facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of activated carbon modification, and in particular to a modification method, modification equipment and filter material of a composite activated carbon fiber filter material. Background Art

[0002] Activated carbon fiber is a high-performance adsorption material made from organic fibers through high-temperature carbonization and activation. It has the characteristics of large specific surface area, abundant micropores, diverse surface functional groups, and good flexibility. Therefore, activated carbon fiber can be processed into various forms and is widely used in many fields such as air purification, water treatment, energy and environmental protection, and medical and health care. Activated carbon fiber itself has poor strength and lacks support. When used, ordinary activated carbon fiber can only physically adsorb pollutants such as VOCs and lacks catalytic decomposition or chemical adsorption. Therefore, it is necessary to use composite modified activated carbon fibers to enhance their adsorption effect and realize functions such as catalytic decomposition.

[0003] Existing technologies have explored various approaches to exploit the high adsorption properties of activated carbon fibers, such as loading activated carbon fibers with TiO2 photocatalysts, loading activated carbon fibers with eco-enzymes, and doping activated carbon fibers with alumina. However, loading activated carbon fibers with photocatalysts is affected by the particle diameter of the photocatalysts, which can easily clog the activated carbon's adsorption pores and reduce its specific surface area, resulting in reduced adsorption capacity. Furthermore, limitations in loading techniques make it difficult to uniformly and uniformly load the photocatalyst onto the activated carbon fibers, hindering their full photocatalytic performance. Loading activated carbon fibers with eco-enzymes, as they are proteins, can be susceptible to environmental interference, leading to denaturation or reduced substrate binding capacity. This results in unstable purification performance, and the loading and uniformity of the eco-enzyme are difficult to control, resulting in uneven purification results. The doping ratio of activated carbon fibers with alumina requires extensive experimentation and optimization based on the application scenario and pollutant type to achieve optimal purification results. This is time-consuming and labor-intensive, and the addition of alumina increases filter media cost and affects its mechanical strength. Improper handling can lead to filter media breakage or deformation.

[0004] In addition, the surface of activated carbon fiber is rich in polar groups such as hydroxyl and carboxyl groups. These polar groups are more easily combined with water molecules than formaldehyde. Therefore, it is necessary to improve the water absorption of activated carbon fiber, increase the hydrophobicity of activated carbon and reduce the priority of water molecules occupying micropores, so as to improve the adsorption capacity of activated carbon fiber for VOC and formaldehyde. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects of activated carbon modification in the prior art, thereby providing a modification method, modification equipment and filter material of a composite activated carbon fiber filter material.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] A modification method for composite activated carbon fiber filter material, comprising: step 1: activation pretreatment: the activated carbon fiber is immersed in a NaOH solution at a constant temperature of 60°C, countercurrently rinsed to pH = 7 with ultrasonic assistance, centrifuged and dehydrated to a moisture content of ≤15%, and then sent to an impregnation box for oxidation at room temperature for 2 hours, a 30% H2O2 solution is configured in a roller impregnation reactor, and 0.1% Fe is also added to the impregnation box. 2+ catalyst;

[0008] Step 2: Grafting reaction: The activated carbon fibers were mixed with 0.2-0.25 mol / L β-amino vinyl sulfone ethanol solution at a solid-liquid ratio of 1:(8-10), and the mixture was subjected to constant temperature shaking reaction at 60°C for 4 hours, followed by washing with deionized water three times and vacuum drying at 50°C for 12 hours.

[0009] Step 3: Dynamic condensation: The grafted activated carbon fibers were mixed with a 1.0-1.2 mol / L diimidazole aqueous solution at a solid-liquid ratio of 1:8, stirred magnetically at 50°C for 2 hours, washed twice with ethanol, and then dried at 60°C for 8 hours. The pH of the diimidazole aqueous solution was first adjusted to 9.5±0.2 with NaOH.

[0010] Step 4: Metal loading: The condensed activated carbon fiber is immersed in a 0.05-0.1 mol / L manganese nitrate solution at room temperature for three times, each time for 4 hours; the impregnated activated carbon fiber is calcined at 300°C ± 5°C for 2 hours under N2 protection.

[0011] Furthermore, step 4 further includes immersing the activated carbon fiber calcined at high temperature in a 0.05-0.5 mol / L AgNO3 solution, adsorbing it at room temperature for 2 hours under light-proof conditions, adding a citric acid complexing agent, and then vacuum drying it at 40°C.

[0012] By adopting the above technical solution, in step 1, the ash on the surface of the activated carbon fiber is removed by alkali treatment with ultrasonic assistance, thereby exposing the original hydroxyl groups, which are subsequently oxidized in a H2O2 solution to generate new hydroxyl groups and a small amount of carboxyl groups, thereby increasing the density of surface oxygen-containing groups and achieving the purpose of carbon fiber surface activation pretreatment;

[0013] In step 2, the Michael addition reaction is used, and the hydroxyl groups on the surface of the activated carbon fiber act as nucleophiles to attack the vinyl sulfone double bond of β-amino vinyl sulfone (β-AEVS), forming a C-O covalent bond to complete the grafting. The specific reaction is as follows: -OH+CH2=CH-SO2-CH2-CH2-NH2→-O-CH2-CH2-SO2-CH2-CH2-NH2;

[0014] In step 3, the Schiff base reaction is used to condense the amino groups of the diimidazole ketone with the residual formaldehyde on the surface of the activated carbon fiber or the amino groups of the grafted β-amino vinyl sulfone to form a stable nitrogen-containing heterocycle. The specific reaction is as follows: -NH2 + HCHO → -N = CH2 + H2O. After this modification, when the activated carbon fiber is used, the β-amino structure (-C = O) of the diimidazole ketone will form hydrogen bonds with the formaldehyde molecules, enhancing the adsorption selectivity, and at the same time, it will form a "double amino capture site" with the amino group of β-AEVS.

[0015] In step 4, manganese nitrate decomposes to produce MnO2 nanoparticles (particle size 20-50mm), which are then impregnated with activated carbon fibers. The MnO2 nanoparticles are evenly distributed within the pores and surface of the activated carbon fibers. When the activated carbon fibers are subsequently used, the MnO2 acts as a catalytic active center, promoting formaldehyde oxidation. The specific reaction is: HCHO + MnO2 → CO2 + H2O + MnO. MnO can then be regenerated into MnO2 by air. Anionic antibacterial and antiviral particles are also added in step 4 to enhance the activated carbon fibers' antibacterial and antiviral capabilities.

[0016] This application constructs a triple modification mechanism of bifunctional covalent grafting, β-amine cooperative adsorption and metal catalysis to construct a composite functional layer of chemical adsorption sites, catalytic active centers and anti-moisture protective layer on the surface of activated carbon fibers, thereby achieving efficient adsorption, directional fixation and catalytic decomposition of formaldehyde, and solving the problems of decreased efficiency and secondary release of traditional activated carbon fibers under high humidity.

[0017] A modification device for composite activated carbon fiber filter material is suitable for the above-mentioned modification method, comprising a mounting bracket, an impregnation box and an impregnation roller. The impregnation box is mounted on the mounting bracket, and the impregnation roller is coaxially arranged with the impregnation box and is positioned and rotatably mounted in the impregnation box. A rotating motor for driving the impregnation roller to rotate is also provided at one end of the outer side of the impregnation box. Multiple chemical tanks are arranged in parallel on one side of the mounting bracket, and the chemical tanks are connected to the impregnation box and the impregnation roller through a chemical liquid circulation component.

[0018] By adopting the above technical solution, due to the characteristics of the activated carbon fiber itself - the overall strength is relatively low, and most of it is in the form of coils after production, conventional soaking equipment cannot be used for the impregnation operation. Therefore, an impregnation roller and an impregnation box are used to impregnate the activated carbon fiber; before use, the activated carbon fiber is placed in the impregnation roller, and then the agent is transported to the impregnation roller by the agent tank, and the liquid circulation part is started to circulate the liquid and continuously replenish the agent until the concentration of the agent is too low or the impurities in the agent exceed the set value. The liquid is then discharged and the impregnation operation is completed. At this time, the impregnation roller can be controlled to continuously rotate to dry and dehydrate, and then the activated carbon fiber is taken out for another drying process.

[0019] Furthermore, the impregnation box includes a cylindrical main box with an opening and an arc-shaped box cover. The box cover is installed on the front side of the main box and is clamped with the main box. The box cover and the main box form a complete hollow cylinder. A plurality of circulation medicine ports are opened at the bottom of the main box and connected to the medicine circulation part. The circulation medicine ports are arranged in an array along the length direction of the main box. An ultrasonic device is also provided on the side wall of the main box away from the rotating motor.

[0020] By adopting the above technical solution, the main box body and the box cover form a complete impregnation box body. The impregnation box body is connected to the liquid medicine circulation part through the circulation medicine port at the bottom, so that the circulation impregnation can be achieved by replenishing the medicine through the medicine tank in the future, thereby improving the utilization rate of the medicine and the completeness of the impregnation. The use of an ultrasonic device can increase the adsorption and grafting amount of the activated carbon fiber to the medicine, thereby ensuring the success rate of the modification.

[0021] Furthermore, the dipping roller includes a coaxially arranged loading roller and a roller core drum, the loading roller is sleeved on the outside of the roller core drum and the loading roller and the roller core drum are both installed in the main box body, both ends of the loading roller are connected to a rotating bracket, the rotating bracket at one end is connected to the rotating motor and the rotating bracket at the other end is connected to the transmission roller, the rotating motor drives the rotating bracket to rotate, the transmission roller is coaxially arranged with the main box body and is arranged at the end away from the rotating motor, the center of the transmission roller is provided with a through-tube channel, the rotating bracket includes an integral center frame and a plurality of rotating frames, the rotating frames are arranged in an array along the circumference of the center frame, one end of the rotating frame is connected to the outer end of the loading roller and the other end is fixed to the side wall of the center frame, and the center of the center frame is provided with a through-tube hole.

[0022] By adopting the above technical solution, the rotating bracket is driven and controlled by a rotating motor and is arranged at both ends of the loading roller to control the rotation of the loading roller, thereby driving the flow of liquid inside the impregnation box. The high-speed rotation of the loading roller generates centrifugal force, so that the agent in the roller core can diffuse outward layer by layer, and finally complete the impregnation operation of the activated carbon fiber.

[0023] Furthermore, the loading roller includes a main roller and a roller front cover that are cylindrical after splicing. The roller front cover is installed on the front side of the main roller and is clamped with the main roller. The side walls of the main roller and the roller front cover are provided with multiple impregnation holes along the axis array. The impregnation holes are also arranged in a circumferential array along the axis of the main roller and the roller front cover. A group of clamping frames are provided at both ends of the main roller. The clamping frames are semicircular and arranged opposite to each other. The inner diameter of the clamping frames is equal to the outer diameter of the roller core.

[0024] By adopting the above technical solution, the main roller and the roller front cover constitute a complete loading roller. When in use, the roller front cover is opened to load the activated carbon fiber into the main roller, and then the roller front cover and the main roller are snap-fitted and closed, so that the activated carbon fiber will complete the impregnation operation inside the loading roller; clamping frames are set at both ends of the main roller to drive the internal roller core to rotate, so that the medicine in the roller core is rotated out due to centrifugal force, thereby realizing the diffusion of the medicine.

[0025] Furthermore, the roller core includes an outer roller core and an inner roller core arranged coaxially, and the outer roller core and the inner roller core are closed and arranged near one end of the rotating motor. The outer roller core is provided with a medicine discharge hole, and the inner roller core is provided with a medicine outlet hole. The medicine discharge hole and the medicine outlet hole are staggered and the diameter of the medicine discharge hole is larger than the diameter of the medicine outlet hole. The outer roller core is connected to the inner wall of the loading roller through a clamping frame.

[0026] By adopting the above technical solution, a double-layer roller core is set to prevent the liquid medicine from flowing too fast and damaging the inner layer of activated carbon fibers. The discharge hole and the outlet hole are staggered to increase the flow distance of the liquid medicine to avoid the liquid medicine from directly diffusing too quickly and also to achieve complete diffusion of the liquid medicine.

[0027] Furthermore, the roller core is connected to the medicine liquid circulation part through the medicine delivery part, and the medicine delivery part includes a medicine delivery tube and a plurality of mixing blades. The two ends of the medicine delivery tube are respectively connected to the medicine liquid circulation part and the inner roller core. The medicine delivery tube is connected to the inner roller core through a tube channel. The mixing blades are single spiral and are installed in the medicine delivery tube in an axial array along the medicine delivery tube.

[0028] By adopting the above technical solution, since multiple medicine tanks are set up, the medicines are not fully mixed when they are transported into the infusion pump. In the high-speed flow pipeline, multiple medicines cannot be fully mixed evenly due to the laminar flow effect. Therefore, in order to avoid the inability to fully mix the medicines after entering the roller core tube and affect the impregnation effect, multiple mixing blades are arranged in an array in the medicine delivery tube to achieve static mixing during medicine delivery, which is convenient for subsequent impregnation.

[0029] Furthermore, the liquid medicine circulation component includes a circulation pump, a circulation water pipe and a return water solenoid valve. The circulation pump is installed in a mounting bracket. The top of the circulation pump is connected to the medicine delivery component and one end is also connected to the medicine tank. One end of the circulation water pipe is connected to the circulation pump, and the other end is connected to a drainage component. A circulation branch pipe extends from the circulation water pipe and is connected to the circulation medicine port. A medicine concentration detector is also provided near the middle of the circulation water pipe. The return water solenoid valve is provided on one end of the circulation water pipe near the circulation pump. A drainage solenoid valve is also provided on one end of the circulation water pipe near the drainage component. The drainage component includes a drainage pipe and a drainage pump, and the drainage pump is also installed in the mounting bracket.

[0030] By adopting the above technical solution, the multiple chemicals transported by the chemical tank are diffused from the central roller core to the surrounding area. The roller core rotates with the loading roller, generating centrifugal force that drives the chemical liquid to diffuse toward the outer wall of the loading roller. The chemical circulation component operates, and the liquid at the bottom is passed through the circulation branch pipe into the circulating water pipe. During the circulation operation, the return water solenoid valve is activated, and the internal chemical liquid is re-entered into the roller core through the circulation pump. The chemical concentration detector is used to measure the chemical content inside the impregnation tank. When the chemical concentration meets the standard and the impurities are low, the chemical tank replenishes the chemical to achieve cyclic impregnation. When the internal chemical impurities are high and the active ingredients are low, the return water solenoid valve is closed, the drain solenoid valve and the drainage pump are activated, and the waste liquid is discharged through the drainage pipe for the next step. After the internal waste liquid is emptied, the rotary motor can continue to control the movement to dry the activated carbon fiber inside.

[0031] A composite activated carbon fiber filter material comprises the activated carbon fiber prepared as described above, and also comprises a protective layer made of PP material and a base layer made of PTE material. The protective layer and the base layer are both hot-pressed and composited with the activated carbon fiber. The protective layer is arranged to cover the upper side of the activated carbon fiber, and the base layer is arranged to cover the lower side of the activated carbon fiber. A plurality of granular balls are evenly arranged between the protective layer and the activated carbon fiber, and the diameter of the granular balls is 0.5-1 mm.

[0032] By adopting the above-mentioned technical solution, the protective layer constitutes the outside of the modified activated carbon fiber and provides antibacterial function, the base layer constitutes the bottom foundation of the modified activated carbon fiber, enhances the stability of the filter material, and the protective layer and the base layer are both treated with water-repellent properties, which can effectively block the penetration of water vapor, ensuring that the internal activated carbon fiber can still maintain a high formaldehyde removal performance in a high humidity environment; in addition, since the photocatalyst needs to be attached to the surface of the material to work and the active enzyme is easily inactivated in a long-term high-temperature environment, the present application adopts a post-enhancement method to add the photocatalyst and the active enzyme. The photocatalyst and the active enzyme are pre-loaded on the granular balls and then evenly distributed on the activated carbon fiber, finally realizing the loading operation of the photocatalyst and the active enzyme.

[0033] In summary, the technical solution of the present invention has the following advantages:

[0034] 1. The modification method of the composite activated carbon fiber filter material provided by the present invention forms a triple modification mechanism, realizing the construction of a composite functional layer on the surface of the activated carbon fiber by covalent grafting of two functional groups, synergistic adsorption and metal-loaded catalysis, thereby achieving the purpose of efficient adsorption, directional fixation and catalytic decomposition of formaldehyde, and solving the problems of decreased efficiency and secondary release of traditional activated carbon fibers in high humidity environments.

[0035] 2. The modification method of the composite activated carbon fiber filter material provided by the present invention forms a stable nitrogen-containing heterocyclic structure through covalent grafting of β-amino vinyl sulfone and amination of diimidazole during the modification process. The nitrogen-containing heterocyclic structure enhances the adsorption selectivity of formaldehyde and also plays a role in moisture protection, effectively reducing the competitive interference of water molecules on the adsorption sites.

[0036] 3. The modification equipment for composite activated carbon fiber filter material provided by the present invention adopts central control by a main control console, and can perform impregnation operations on a whole roll of activated carbon fiber. The high-speed rotation of the roller generates centrifugal force so that the agent can diffuse outward layer by layer, and cooperates with the ultrasonic device to cause high-frequency vibration of water molecules and agent molecules, thereby facilitating the entry of water molecules and agent molecules into the pore structure of the activated carbon fiber, thereby achieving the purpose of sufficient impregnation of the agent.

[0037] 4. The modification equipment for the composite activated carbon fiber filter material provided by the present invention is provided with a liquid circulation part to cooperate with the rotation of the roller, thereby forming a dynamic circulation process inside the impregnation box. Compared with the existing natural adsorption balance method, the circulation pump forces the internal liquid to flow and circulate and cooperates with the liquid discharge system's liquid concentration detector to achieve cyclic impregnation by supplementing the liquid when the internal effective liquid component meets the standard, thereby ensuring the utilization rate of the liquid. After a certain period of circulation, when the effective components of the liquid are reduced, the waste liquid is directly discharged to complete the impregnation cycle of the modified activated carbon fiber.

[0038] 4. The modification equipment for composite activated carbon fiber filter material provided by the present invention realizes the composite operation of double-sided water-blocking non-woven fabric on the modified activated carbon fiber, and photocatalytic agents and active enzyme materials are installed inside for reinforcement, thereby realizing the composite functionality of the activated carbon fiber filter material and improving its adaptability and mechanical strength, and is suitable for household or industrial purifiers. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 Schematic diagram of the overall process of a method for modifying a composite activated carbon fiber filter material provided in one embodiment of the present invention;

[0041] Figure 2 Schematic diagram of the overall structure of a modification device for a composite activated carbon fiber filter material provided in one embodiment of the present invention;

[0042] Figure 3A schematic diagram of the internal structure of a modification device for a composite activated carbon fiber filter material provided in one embodiment of the present invention;

[0043] Figure 4 A schematic cross-sectional view of a device for modifying a composite activated carbon fiber filter material according to one embodiment of the present invention;

[0044] Figure 5 A schematic diagram of a partial explosion structure of an impregnation roller provided in one embodiment of the present invention;

[0045] Figure 6 A schematic diagram of a partial cross-sectional structure of an inner roller core and a medicine delivery member provided in one embodiment of the present invention;

[0046] Figure 7 The figure is a schematic diagram of the explosion structure of a composite activated carbon fiber filter material provided in one embodiment of the present invention.

[0047] Description of reference numerals:

[0048] 1. Mounting bracket; 2. Impregnation box; 21. Main box; 211. Circulation port; 212. Ultrasonic device; 213. Drive roller; 2131. Pipe passage; 22. Box cover; 3. Impregnation roller; 31. Loading roller; 311. Main roller; 312. Roller front cover; 313. Impregnation hole; 314. Clamping frame; 32. Roller core; 321. Outer roller core; 3211. Drug discharge hole; 322. Inner roller core; 3221. Drug discharge hole; 33. Rotating bracket; 331. Center frame; 3311. Pipe hole; 332. Rotating frame; 4. Rotating motor; 5. Chemical tank; 6. Chemical liquid circulation component; 61. Circulation pump; 62. Circulating water pipe; 621. Circulation branch pipe; 622. Chemical concentration detector; 63. Return water solenoid valve; 64. Drain component; 641. Drain pipe; 642. Drain pump; 65. Drain solenoid valve; 7. Chemical delivery component; 71. Chemical delivery pipe; 72. Mixing blade; 8. Protective layer; 9. Base layer; 10. Granular ball. DETAILED DESCRIPTION

[0049] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0050] A modification method for composite activated carbon fiber filter material, such as Figure 1As shown, it includes: Step 1: Activation pretreatment: The activated carbon fiber is immersed in NaOH solution at a constant temperature of 60°C, washed in countercurrent until the pH is 7 and ultrasonically assisted, centrifuged and dehydrated to a moisture content of ≤15%, and sent to an impregnation box for oxidation at room temperature for 2 hours. A 30% H2O2 solution is configured in the roller impregnation reactor, and 0.1% Fe is also added to the impregnation box. 2+ catalyst;

[0051] Step 2: Grafting reaction: The activated carbon fibers were mixed with 0.2-0.25 mol / L β-AEVS ethanol solution at a solid-liquid ratio of 1:(8-10), and the mixture was shaken at 60°C for 4 hours, then washed with deionized water three times, and then vacuum dried at 50°C for 12 hours.

[0052] Step 3: Dynamic condensation: The grafted activated carbon fibers were mixed with a 1.0-1.2 mol / L diimidazole aqueous solution at a solid-liquid ratio of 1:8, stirred magnetically at 50°C for 2 hours, washed twice with ethanol, and then dried at 60°C for 8 hours. The pH of the diimidazole aqueous solution was first adjusted to 9.5±0.2 with NaOH.

[0053] Step 4: Metal Loading: The condensed activated carbon fibers are immersed in a 0.05-0.1 mol / L manganese nitrate solution at room temperature for three 4-hour soaks, with the moisture content controlled to ≤20%. The impregnated activated carbon fibers are then calcined at 300°C ± 5°C for 2 hours under nitrogen protection. Step 4 also includes immersing the calcined activated carbon fibers in a 0.05-0.5 mol / L AgNO3 solution for adsorption at room temperature for 2 hours in the dark. Citric acid complexing agent is then added, and the fibers are then vacuum-dried at 40°C.

[0054] For small-batch trials or laboratory production, use a 5% NaOH solution in a 60°C water bath in step 1; add a 0.2 mol / L β-AEVS ethanol solution in a solid-to-liquid ratio of 1:10 in step 2; add a 1.0 mol / L diimidazolidinone aqueous solution in a solid-to-liquid ratio of 1:8 in step 3; and use a 0.05 mol / L manganese nitrate solution in step 4 to control the MnO2 loading to 2%.

[0055] For large-scale industrial production, the ethanol solvent in step 2 is replaced with bioethanol or industrial-grade ethanol (purity ≥95%), correspondingly increasing the reaction time by 6 hours to compensate for purity loss and reduce costs. The purity of the diimidazole aqueous solution in step 3 is maintained at ≥99%, and dynamic pH adjustment (dropwise addition of NaOH solution) is employed instead of dynamic pH regulation. Furthermore, the oxygen generated during the oxidative hydroxylation reaction in step 1 is recovered and reused in the calcination step in step 4. The ethanol in step 2 is concentrated and recovered using a multi-effect evaporator with a recovery rate of ≥90%, and the residual β-AEVS is adsorbed on activated carbon. The waste heat from the tail gas in step 4 is utilized for pretreatment heating in step 1.

[0056] Industrial mass production is controlled through a central control system. A PLC module implements PID closed-loop control of temperature, pH, and flow rate during the experimental process, providing prompt alarms in the event of anomalies. Production batches are traceable, establishing a data chain from raw material input to finished product testing, ensuring transparent and accurate production traceability. Exhaust gas treatment devices—zeolite wheel adsorption and regenerator combustion (RTO)—are installed to treat VOCs. Emergency measures, such as NaOH leak neutralization tanks and explosion-proof pressure relief devices, are also in place to ensure the safety and cleanliness of the industrial production process.

[0057] A modification device for composite activated carbon fiber filter material, suitable for the above modification method, such as Figure 2 and Figure 3 As shown, it includes a mounting bracket 1, an impregnation box 2 and an impregnation roller 3. The impregnation box 2 is mounted on the mounting bracket 1. The impregnation roller 3 is coaxially arranged with the impregnation box 2 and is positioned and rotatably mounted in the impregnation box 2. A rotating motor 4 for driving the impregnation roller 3 is also provided at one end of the outer side of the impregnation box 2. The rotating motor 4 is provided at the right end. A plurality of chemical tanks 5 are arranged in parallel on the rear side of the mounting bracket 1. The chemical tanks 5 are connected to the impregnation box 2 and the impregnation roller 3 through a chemical liquid circulation part 6. The rotating motor 4 and the chemical liquid circulation part 6 are centrally controlled by a central control console through a PLC. The device of the present application is suitable for rolled activated carbon fibers with low overall strength and is also convenient for the dehydration operation of the activated carbon fibers after the impregnation is completed.

[0058] like Figure 2 and Figure 3As shown, the impregnation box 2 includes a cylindrical main box 21 with an opening and an arc-shaped box cover 22. The box cover 22 is installed on the upper front side of the main box 21 and is clamped with the main box 21. The box cover 22 and the main box 21 form a complete hollow cylinder. A plurality of circulation medicine ports 211 are opened at the bottom of the main box 21 to be connected to the medicine circulation part 6. The circulation medicine ports 211 are arranged in an array along the length direction of the main box 21 and the axis of the circulation medicine port 211 is arranged vertically. An ultrasonic device 212 is also provided on the side wall of the end of the main box 21 away from the rotating motor 4, that is, an ultrasonic device 212 is provided on the right end of the main box 21, and the ultrasonic device 212 also extends to the interior of the main box 21. The main box body 21 and the box cover 22 constitute a complete impregnation box body 2. The impregnation box body 2 is connected to the liquid medicine circulation part 6 through the circulation medicine port 211 at the bottom, so that the circulation impregnation can be achieved by replenishing the medicine through the medicine tank 5 in the future, thereby improving the utilization rate of the medicine and the completeness of the impregnation. The use of the ultrasonic device 212 can increase the adsorption amount and grafting amount of the activated carbon fiber to the medicine, thereby ensuring the success rate of the modification.

[0059] like Figure 3 、 Figure 4 and Figure 5 As shown, the dipping roller 3 includes a coaxially arranged charging roller 31 and a roller core 32 , the charging roller 31 is sleeved on the outside of the roller core 32 and both the charging roller 31 and the roller core 32 are installed in the main box 21 .

[0060] The loading roller 31 comprises a main roller 311 and a roller front cover 312, which are joined together to form a cylindrical shape. The roller front cover 312 is mounted on the front side of the main roller 311 and is snap-fitted to the main roller 311. Multiple impregnation holes 313 are arranged in an array along the axis of both the main roller 311 and the roller front cover 312. The impregnation holes 313 are also arranged in an array along the axis of the main roller 311 and the roller front cover 312. Multiple impregnation holes 313 are also arranged in an array at both ends of the main roller 311. The main roller 311 and the roller front cover 312 form the complete loading roller 31. During use, the roller front cover 312 is opened to load the activated carbon fibers into the main roller 311. The roller front cover 312 is then snap-fitted to the main roller 311, completing the impregnation of the activated carbon fibers within the loading roller 31.

[0061] The roller core 32 includes a coaxially arranged outer roller core 321 and an inner roller core 322. The outer roller core 321 and the inner roller core 322 are closed at one end near the rotating motor 4. The outer roller core 321 is provided with a drug discharge hole 3211, and the inner roller core 322 is provided with a drug outlet hole 3221. The drug discharge hole 3211 and the drug outlet hole 3221 are staggered, and the diameter of the drug discharge hole 3211 is larger than the diameter of the drug outlet hole 3221. The double-layer roller core 32 prevents the rapid flow of the drug solution from damaging the activated carbon fibers in the inner layer. The staggered arrangement of the drug discharge hole 3211 and the drug outlet hole 3221 increases the flow distance of the drug solution, prevents the drug solution from directly diffusing too quickly, and ensures complete diffusion of the drug solution.

[0062] A set of clamping frames 314 are installed at both ends of the main roller 311. These clamping frames 314 are semicircular and arranged opposite each other. The inner diameter of the clamping frames 314 is equal to the outer diameter of the roller core 32. The outer roller core 321 is connected to the inner wall of the loading roller 31 through the clamping frames 314. The clamping frames 314 at both ends of the main roller 311 drive the roller core 32 to rotate, thereby causing the medicine inside the roller core 32 to be dissipated due to centrifugal force, thereby achieving drug diffusion.

[0063] like Figure 4 and Figure 5 As shown, rotating brackets 33 are connected to both ends of the loading roller 31. The right-hand rotating bracket 33 is connected to the rotating motor 4, while the left-hand rotating bracket 33 is connected to the driving roller 213. The rotating motor 4 drives the rotating bracket 33 to rotate. The driving roller 213 is coaxially arranged with the main housing 21 and located at the end away from the rotating motor 4. A pipe passage 2131 is defined through the center of the driving roller 213. The rotating bracket 33 includes an integral central frame 331 and multiple rotating brackets 332. The rotating brackets 332 are arranged in an array around the circumference of the central frame 331. One end of the rotating bracket 332 is connected to the outer end of the loading roller 31 and the other end is fixed to the side wall of the central frame 331. A pipe passage 3311 is defined through the center of the central frame 331. The multiple rotating brackets 332 provide support for the rotation of the loading roller 31 without affecting the diffusion of the reagent, ensuring smooth dipping.

[0064] like Figure 3 、 Figure 4 and Figure 5As shown, the medicine circulation component 6 includes a circulation pump 61, a circulation water pipe 62 and a return water solenoid valve 63. The circulation pump 61 is installed in the mounting bracket 1. The top of the circulation pump 61 is connected to the medicine conveying component 7 and one end is also connected to the medicine tank 5. One end of the circulation water pipe 62 is connected to the circulation pump 61, and the other end is connected to the drainage component 64. A circulation branch pipe 621 extends from the circulation water pipe 62 and is connected to the circulation medicine port 211. The return water solenoid valve 63 is arranged at one end of the circulation water pipe 62 close to the circulation pump 61. A drainage solenoid valve 65 is also provided at one end of the circulation water pipe 62 close to the drainage component 64. The drainage component 64 includes a drainage pipe 641 and a drainage pump 642. The drainage pump 642 is also installed in the mounting bracket 1. The multiple chemicals delivered by the chemical tank 5 diffuse from the central roller core 32 to the surrounding area. The roller core 32 rotates with the loading roller 31, generating centrifugal force that drives the chemical liquid toward the outer wall of the loading roller 31. The chemical circulation unit 6 operates, transferring the liquid at the bottom through the circulation branch pipe 621 into the circulating water pipe 62. At this point, the return solenoid valve 63 opens, and the drain solenoid valve 65 closes. The chemical liquid flows out of the return solenoid valve 63 and re-enters the roller core 32 via the circulation pump 61. The chemical concentration meter 622 measures the chemical content inside the impregnation tank 2. If the chemical concentration meets the standard and impurities are low, the chemical tank 5 replenishes the chemical to achieve a continuous impregnation process. If the chemical internally contains impurities and active ingredients is low, the return solenoid valve 63 closes, the drain solenoid valve 65 activates, and the drainage pump 642 is activated to drain the waste liquid through the drainage pipe 641, allowing the next step to proceed. After the internal waste liquid is drained, the rotary motor 4 can continue to operate to dry the activated carbon fibers inside.

[0065] like Figure 4 and Figure 6 As shown, the roller core 32 is connected to the liquid medicine circulation unit 6 via the drug delivery unit 7. The drug delivery unit 7 includes a drug delivery tube 71 and multiple mixing blades 72. The drug delivery tube 71 is connected to the liquid medicine circulation unit 6 and the inner roller core 322 at both ends, respectively. The drug delivery tube 71 is connected to the inner roller core 322 via a tube passage 2131. The connection with the inner roller core 322 utilizes a quick-release mechanism, allowing for easy disassembly without affecting the rotation of the inner roller core 322. The mixing blades 72 are single-helical and arranged in an array along the axial direction of the drug delivery tube 71. The presence of multiple drug tanks 5 prevents the drugs from being fully mixed when they enter the infusion pump. Furthermore, in high-speed pipelines, multiple drugs cannot be fully mixed due to laminar flow. Therefore, to prevent the drugs from being mixed poorly after entering the roller core 32, which could affect the infusion effect, multiple mixing blades 72 are arranged in an array within the drug delivery tube 71 to achieve static mixing during drug delivery and facilitate subsequent infusion.

[0066] A composite activated carbon fiber filter material, such as Figure 7As shown, the modified activated carbon fiber produced using the above-mentioned modification method also includes a protective layer 8 made of PP and a base layer 9 made of PTE. Both the protective layer 8 and the base layer 9 are hot-pressed and laminated with the modified activated carbon fiber. The protective layer 8 covers the upper side of the modified activated carbon fiber, while the base layer 9 covers the lower side of the modified activated carbon fiber. The protective layer 8 forms the exterior of the modified activated carbon fiber and provides antibacterial properties. The base layer 9 forms the bottom layer of the modified activated carbon fiber, enhancing the stability of the filter material. The protective layer 8 and the base layer 9 are treated to be water-resistant, effectively preventing water vapor from penetrating, ensuring that the modified activated carbon fiber inside can maintain high formaldehyde removal performance even in high humidity environments. A plurality of granular balls 10 are evenly arranged between the protective layer 8 and the modified activated carbon fiber. The granular balls 10 have a diameter of 0.5-1 mm. Since photocatalysts need to attach to the surface of the material to work and active enzymes are easily inactivated in a long-term high-temperature environment, this application adopts a post-enhancement method to add photocatalysts and active enzymes. The photocatalysts and active enzymes are pre-loaded on the granular balls 10 and then evenly distributed on the modified activated carbon fibers, ultimately realizing the loading operation of the photocatalysts and active enzymes.

[0067] The working principle and use method of the modification equipment of the composite activated carbon fiber filter material are as follows: open the box cover 22, then open the roller front cover 312, load the whole roll of activated carbon fiber into the loading roller 31, then close the roller front cover 312 and the box cover 22, then connect the agent delivery pipe 71 and the roller core 32, check the connection pipeline between the liquid medicine circulation part 6 and the medicine tank 5; turn on the equipment through the central control console, and after the circulation pump 61 delivers the medicine in the medicine tank 5 to the roller core 32, control the rotating motor 4 to rotate and drive the impregnation The roller 3 rotates, and the ultrasonic device 212 is turned on at the same time to improve the impregnation effect; after the impregnation roller 3 works, the liquid circulation part 6 also starts working and cooperates with the drug concentration detector 622 to detect the concentration of internal drug components. When the drug concentration drops to a certain standard and the drug tank 5 is not replenished, the drainage part 64 is started to discharge the waste liquid, and finally the rotating motor 4 continues to rotate at high speed to dehydrate and dry the activated carbon fiber. After dehydration is completed, open the box cover 22 and the roller front cover 312 to take out the activated carbon fiber and proceed to the next drying operation.

[0068] The foregoing description shows and describes preferred embodiments of the present invention. As previously mentioned, it should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the inventive concept described herein by the teachings above or by techniques or knowledge in the relevant art. Modifications and variations made by those skilled in the art without departing from the spirit and scope of the present invention are intended to be within the scope of the appended claims.

Claims

1. A method for modifying a composite activated carbon fiber filter material, characterized in that: include: Step 1: Activation pretreatment: The activated carbon fiber is immersed in NaOH solution at a constant temperature of 60°C, washed in countercurrent until pH = 7 and assisted by ultrasound, centrifuged and dehydrated to a moisture content of ≤15%, and sent to the impregnation box (2) for oxidation at room temperature for 2 hours. 30% H2O2 solution is configured in the impregnation box (2), and 0.1% Fe is also added to the impregnation box (2). 2+ catalyst; Step 2: Grafting reaction: The activated carbon fibers were mixed with 0.2-0.25 mol / L β-amino vinyl sulfone ethanol solution at a solid-liquid ratio of 1:(8-10), and the mixture was subjected to constant temperature shaking reaction at 60°C for 4 hours, followed by washing with deionized water three times and vacuum drying at 50°C for 12 hours. Step 3: Dynamic condensation: The grafted activated carbon fibers were mixed with a 1.0-1.2 mol / L diimidazole aqueous solution at a solid-liquid ratio of 1:8, magnetically stirred at 50°C for 2 hours, washed twice with ethanol, and then dried at 60°C for 8 hours. The pH of the diimidazole aqueous solution was first adjusted to 9.5±0.2 with NaOH. Step 4: Metal loading: The condensed activated carbon fiber is immersed in a 0.05-0.1 mol / L manganese nitrate solution at room temperature for three times, each time for 4 hours; the impregnated activated carbon fiber is calcined at 300°C ± 5°C for 2 hours under N2 protection.

2. The method for modifying a composite activated carbon fiber filter material according to claim 1, characterized in that: Step 4 also includes immersing the activated carbon fiber calcined at high temperature in a 0.05-0.5 mol / L AgNO3 solution, adsorbing it at room temperature for 2 hours under light-proof conditions, adding a citric acid complexing agent, and then vacuum drying it at 40°C.

3. A modification device for composite activated carbon fiber filter material, characterized in that: The modification method is applicable to any one of claims 1-2, comprising a mounting bracket (1), an impregnation box (2) and an impregnation roller (3), wherein the impregnation box (2) is mounted on the mounting bracket (1), the impregnation roller (3) is coaxially arranged with the impregnation box (2) and is positioned and rotatably mounted in the impregnation box (2), a rotating motor (4) for driving the impregnation roller (3) to rotate is further provided at one end of the outer side of the impregnation box (2), a plurality of chemical tanks (5) are arranged in parallel on one side of the mounting bracket (1), and the chemical tanks (5) are connected to the impregnation box (2) and the impregnation roller (3) through a chemical liquid circulation part (6).

4. The modification equipment for composite activated carbon fiber filter material according to claim 3, characterized in that: The impregnation box (2) comprises a cylindrical main box (21) with an opening and an arc-shaped box cover (22). The box cover (22) is installed on the front side of the main box (21) and is clamped with the main box (21). The box cover (22) and the main box (21) form a complete hollow cylindrical shape. A plurality of circulation ports (211) connected to the liquid medicine circulation component (6) are opened at the bottom of the main box (21). The circulation ports (211) are arranged in an array along the length direction of the main box (21). An ultrasonic device (212) is also provided on the side wall of the main box (21) away from the rotating motor (4).

5. The modification equipment for composite activated carbon fiber filter material according to claim 4, characterized in that: The impregnation roller (3) comprises a coaxially arranged loading roller (31) and a roller core (32), wherein the loading roller (31) is sleeved on the outside of the roller core (32) and both the loading roller (31) and the roller core (32) are installed in the main box (21), and both ends of the loading roller (31) are connected to a rotating bracket (33), the rotating bracket (33) at one end is connected to a rotating motor (4) and the rotating bracket (33) at the other end is connected to a transmission roller (213), the rotating motor (4) drives the rotating bracket (33) to rotate, and the transmission roller (213) is connected to the rotating bracket (33). The main box (21) is coaxially arranged and arranged at one end away from the rotating motor (4); a pipe passage (2131) is provided through the center of the driving roller (213); the rotating bracket (33) includes an integrally arranged center frame (331) and a plurality of rotating frames (332); the rotating frames (332) are arranged in an array along the circumference of the center frame (331); one end of the rotating frame (332) is connected to the outer end of the charging roller (31) and the other end is fixed to the side wall of the center frame (331); and a pipe hole (3311) is provided through the center of the center frame (331).

6. The modification equipment for composite activated carbon fiber filter material according to claim 5, characterized in that: The loading roller (31) comprises a main roller (311) and a roller front cover (312) which are cylindrical after being spliced ​​together. The roller front cover (312) is installed on the front side of the main roller (311) and is clamped with the main roller (311). A plurality of impregnation holes (313) are arranged in an array along the axis on the side walls of the main roller (311) and the roller front cover (312). The impregnation holes (313) are also arranged in an array along the axis of the main roller (311) and the roller front cover (312). A group of clamping frames (314) are arranged at both ends of the main roller (311). The clamping frames (314) are semicircular and arranged opposite to each other. The inner diameter of the clamping frames (314) is equal to the outer diameter of the roller core (32).

7. The modification equipment for composite activated carbon fiber filter material according to claim 6, characterized in that: The roller core (32) comprises an outer roller core (321) and an inner roller core (322) which are coaxially arranged. The outer roller core (321) and the inner roller core (322) are closed and arranged near one end of the rotating motor (4). The outer roller core (321) is provided with a medicine discharge hole (3211), and the inner roller core (322) is provided with a medicine outlet hole (3221). The medicine discharge hole (3211) and the medicine outlet hole (3221) are staggered and the diameter of the medicine discharge hole (3211) is larger than the diameter of the medicine outlet hole (3221). The outer roller core (321) is connected to the inner wall of the charging roller (31) via a clamping frame (314).

8. The modification equipment for composite activated carbon fiber filter material according to claim 7, characterized in that: The roller core drum (32) is connected to the liquid medicine circulation part (6) through the medicine delivery part (7). The medicine delivery part (7) comprises a medicine delivery pipe (71) and a plurality of mixing blades (72). The two ends of the medicine delivery pipe (71) are respectively connected to the liquid medicine circulation part (6) and the inner roller core (322). The medicine delivery pipe (71) is connected to the inner roller core (322) through a pipe passage (2131). The mixing blades (72) are single helical and are arranged in an array along the axial direction of the medicine delivery pipe (71).

9. The modification equipment for composite activated carbon fiber filter material according to claim 8, characterized in that: The liquid medicine circulation component (6) includes a circulation pump (61), a circulation water pipe (62) and a return water solenoid valve (63). The circulation pump (61) is installed in the mounting bracket (1). The top of the circulation pump (61) is connected to the medicine delivery component (7) and one end is also connected to the medicine tank (5). One end of the circulation water pipe (62) is connected to the circulation pump (61) and the other end is connected to the drainage component (64). The circulation water pipe (62) is extended with a circulation branch pipe (621) and a circulation medicine port ( 211), a medicine concentration detector (622) is provided near the middle of the circulating water pipe (62), the return water solenoid valve (63) is provided at one end of the circulating water pipe (62) close to the circulating pump (61), and a drainage solenoid valve (65) is provided at one end of the circulating water pipe (62) close to the drainage member (64), the drainage member (64) includes a drainage pipe (641) and a drainage pump (642), and the drainage pump (642) is also installed in the mounting bracket (1).

10. A composite activated carbon fiber filter material, characterized in that: The invention comprises the modified activated carbon fiber made according to claim 1-2, and further comprises a protective layer (8) made of PP material and a base layer (9) made of PTE material, wherein the protective layer (8) and the base layer (9) are both hot-pressed and composited with the modified activated carbon fiber, the protective layer (8) is arranged to cover the upper side of the modified activated carbon fiber, and the base layer (9) is arranged to support the lower side of the modified activated carbon fiber, and a plurality of granular balls (10) are evenly arranged between the protective layer (8) and the modified activated carbon fiber, and the diameter of the granular balls (10) is 0.5-1 mm.

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