Preparation method of multifunctional filter material for dust removal and denitrification

Abstract

The present invention relates to the fields of atmospheric pollution control and catalytic materials technology, specifically to a method for preparing a multifunctional filter material for dust removal and denitrification. The proposed preparation method, through a heterogeneous reaction between a filter material substrate and an active solution, achieves in situ generation of a metal-organic framework catalytic interface between the catalytically active components on the filter material substrate surface. This effectively achieves efficient and high-strength assembly of the catalytically active components and the filter material, solving the problems of cumbersome preparation steps for multifunctional filter materials for dust removal and denitrification, as well as the pulverization and shedding of the catalytically active components. This invention is of great significance for the industrialization and widespread application of dust removal and denitrification filter bags.

Description

Technical Field

[0001] The present invention relates to the technical field of air pollution control and catalytic materials, and in particular to a method for preparing a multifunctional filter material for dust removal and denitration. Background Art

[0002] The rapid development of modern industry has brought a series of atmospheric environmental problems while developing the economy. At present, the ceramic industry, glass industry and cement industry will also produce a large amount of dust particles (PM) and nitrogen oxides (NO X ) and other toxic and harmful substances, which, once discharged, will cause serious damage to the atmospheric environment. The selective catalytic reduction technology is currently the key technology for industrial flue gas treatment. X The removal efficiency is high and no secondary pollution is generated. The core of selective catalytic reduction technology is the catalyst, so the preparation of a multifunctional filter material for dust removal and denitrification is of great significance to the treatment of industrial flue gas pollution.

[0003] Among the current patents for dust removal and denitrification filter media, Patent (108654633A) uses activated coke prepared from dry quenching dust ash as a carrier and coal tar as a binder, with metal salts adhered to the carrier via the binder. Patent (CN 115193160A) describes an integrated dust removal and denitrification filter media made by hydroentangling a spunbond filament web and a staple fiber web disposed on one or both sides of the spunbond filament web. Patent (CN 109091956A) prepares a ceramic fiber-based integrated dust removal and denitrification filter media by dispersing and mixing to obtain a mixed solution, and then immersing the mixed solution on a ceramic fiber filter cloth. These dust removal and denitrification materials all use physical methods to load the catalyst on the carrier surface or two interfaces for composite preparation. This can lead to problems with the catalyst not being evenly distributed on the carrier surface and being easily detached. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention can be achieved through the following technical solutions:

[0005] A method for preparing a multifunctional filter material for dust removal and denitrification, the method comprising the following steps:

[0006] (1) Prepare active solution: Mix the precursor, activated coupling agent, cosolvent, stabilizer and deionized water in a container and stir continuously for 120-600 minutes at 20-80°C to prepare active solution for use;

[0007] (2) Pre-treat the filter material substrate: immerse the filter material substrate in the treatment solution, shake at 20-80°C for 5-50 minutes; then dry the filter material substrate at 80-180°C for 300-600 minutes;

[0008] (3) In-situ formation of a metal-organic framework catalytic interface: Immerse the treated filter substrate in the active solution and shake it at a temperature of 20-75°C for 10-120 minutes; then move the filter substrate and the active solution into a reactor for reaction; after the reaction, a metal-organic framework catalytic interface is formed in situ on the surface of the filter substrate;

[0009] (4) washing and drying: taking out the filter material substrate after the reaction in step (3) is completed, washing it multiple times with washing liquid A and washing liquid B, and then drying and shaping it to finally obtain a dust removal and denitrification multifunctional filter material with a metal-organic framework catalytic interface;

[0010] The active solution comprises the following components by mass percentage:

[0011]

[0012] Preferably, the precursor is composed of manganese salt, cerium salt, iron salt, copper salt, cobalt salt, chromium salt and nitrogen-containing organic matter;

[0013] The molar ratio of Mn / Ce / Fe / Cu / Co / Cr / N elements in the precursor is 1:(0.1-1.7):(0.1-1.5):(0.1-0.5):(0.1-0.3):(0.1-0.2):(0.1-0.2).

[0014] Preferably, the manganese salt is at least one of manganese sulfate, manganese chloride, and manganese nitrate solution; the cerium salt is at least one of cerium sulfate, cerium chloride, and cerium nitrate; the iron salt is at least one of ferric sulfate, ferric chloride, and ferric nitrate solution; the copper salt is at least one of copper sulfate and copper nitrate solution; the cobalt salt is at least one of cobalt sulfate and cobalt nitrate solution; the chromium salt is at least one of chromium sulfate and chromium nitrate solution; and the nitrogen-containing organic matter is at least one of 1-methyl-2-pyrrolidone and N,N-dimethylformamide.

[0015] Preferably, the activated coupling agent is at least one of sodium hydroxide and sodium hypochlorite; the cosolvent is at least one of isopropyl alcohol, acetone, and ethyl acetate; and the stabilizer is at least one of polyethylene glycol, polylactide, and methyl methacrylate.

[0016] Preferably, the filter material substrate in step (2) is one of PPS fiber filter material, PE filter material, aromatic polyamide fiber filter material, PTFE fiber filter material, glass fiber filter material, P84 filter material or Fluorometh filter material; the treatment solution in step (2) is one of anhydrous ethanol, 5-10% trisodium phosphate, and sodium bicarbonate.

[0017] Preferably, the step of moving the filter material substrate and the active solution into the reactor for reaction in step (3) comprises: moving the filter material substrate and the active solution together into a reactor with a polytetrafluoroethylene liner; fixing the reactor on a rotating support of the reactor, and setting a certain reaction temperature and rotation speed;

[0018] The reaction time of the filter material substrate and the active solution in the reactor is 30-1500 minutes, the reaction temperature is set at 100-300° C., and the rotation speed of the rotating bracket is 50-500 revolutions per minute.

[0019] Preferably, in step (4), detergent A is one of anhydrous ethanol and aldehyde-free ethanol, detergent B is deionized water, and the specific steps of washing in step (4) are: first, soaking and washing with detergent A for 3 times to solidify and shape the metal-organic framework; then soaking and washing with detergent B for 3 times to remove surface impurities.

[0020] Preferably, the drying conditions in step (4) are: first drying at 60-150° C. for 30-200 minutes, then heating to 151-300° C. and drying for 60-500 minutes.

[0021] Beneficial effects of the present invention:

[0022] 1. The present invention provides a multifunctional filter material for dust removal and denitrification. The filter material realizes the in-situ generation of a metal-organic framework (MOF) catalytic interface on the surface of the dust removal filter material by a multiphase reaction, thereby effectively improving the problem of pulverization and shedding of the active components.

[0023] 2. The present invention is simple to operate, the raw materials are readily available, and large-scale production can be achieved.

[0024] 3. Using this dust removal and denitrification composite filter material, the dust removal rate is greater than 99% in the temperature range of 130℃-240℃, and NO X The removal rate is >90%. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0026] Figure 1It is a preparation flow chart of the preparation method of the present invention. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] Example 1

[0029] The preparation method of the multifunctional filter material for dust removal and nitrate removal of the present invention has the following specific process:

[0030] (1) Preparation of active solution

[0031] Step 1: Weigh a precursor (30%), an activated coupling agent (26%), a cosolvent (5%), a stabilizer (4%), and deionized water (35%). The precursor is composed of a certain amount of manganese salt, cerium salt, iron salt, copper salt, cobalt salt, chromium salt, and nitrogen-containing organic matter, with the element molar ratio of Mn / Ce / Fe / Cu / Co / Cr / N = 1:0.1:0.1:0.1:0.1:0.1. Separately weigh manganese sulfate, cerium sulfate, iron sulfate, copper sulfate, cobalt sulfate, chromium sulfate, 1-methyl-2-pyrrolidone, sodium hydroxide, isopropyl alcohol, polyethylene glycol, and deionized water and mix.

[0032] Step 2: Stir the mixture under magnetic stirring at 150 rpm for 120 minutes at 20°C until the solution is completely mixed to obtain the active solution.

[0033] (2) Pretreatment of filter media substrate

[0034] First, the PPS fiber filter material is immersed in anhydrous ethanol and ultrasonically vibrated at 20° C. for 10 minutes; then, the PPS fiber filter material is dried at 80° C. for 300 minutes and cooled to obtain a filter material substrate.

[0035] (3) In situ generation of metal-organic framework (MOF) catalytic interfaces

[0036] Step 1: Immerse the treated filter material substrate in the active solution prepared in step (1) and ultrasonically vibrate at 20° C. for 10 minutes.

[0037] Step 2: The filter substrate and active solution were transferred to a reactor, which was secured to the reactor's rotating stand. The reaction time was set to 100 minutes at a temperature of 100°C and a rotation speed of 100 rpm. The filter substrate and active solution reacted in the reactor. After the reactor cooled naturally, a metal-organic framework (MOF) catalytic interface formed in situ on the filter substrate's surface.

[0038] (4) Washing and drying

[0039] Step 1: After the reaction in step (3) is completed, the filter material is taken out, and it is soaked and washed 3 times with anhydrous ethanol, and then soaked and washed 3 times with deionized water.

[0040] The second step is drying and shaping, first drying at 60°C for 30 minutes, then heating to 151°C and drying for 100 minutes. Finally, a multifunctional filter material for dust removal and denitrification with a metal-organic framework (MOF) catalytic interface is produced.

[0041] The performance of the prepared dust removal and denitrification composite filter material was tested.

[0042] NO X The removal efficiency test method is as follows:

[0043] The experimental device consists of a gas distribution system, flow control (mass flow meter), gas mixer, gas preheater, catalytic reactor and flue gas analysis system. The inner diameter is Ф=20mm. Cut the filter cloth into discs of Ф=20mm and place them in a fixed reactor. The temperature of the constant temperature zone where the filter cloth is located is 0.137°C, and then place the reactor in a fixed tubular reactor. The simulated flue gas composition is: NO (500ppm), NH3 (500ppm), O2 (8%) and carrier gas N2. The filtration wind speed is 1m / min, NH3 / NO=1, and the reaction temperature is controlled at 200°C. The flow rate of each gas is controlled by a mass flow meter. Before entering the reactor, the gas is first mixed by a gas mixer and then heated by a heater. NO at the inlet and outlet x The concentration was measured by a KM9106 (Kane) flue gas analyzer. To eliminate the influence of surface adsorption, the system began collecting data after the ventilation had been running steadily for 20-30 minutes.

[0044] The catalytic activity of the catalyst is mainly through NO x The denitrification activity of NO x The denitrification activity was calculated by the following formula:

[0045]

[0046] Where C0 is the initial concentration and C is the concentration after flue gas treatment.

[0047] The test method for flue gas dust removal efficiency is as follows:

[0048] The filtration performance of the sample was tested using a VDI filter material simulation test device, using Pural NF alumina dust with a dust concentration of 5g / m 3 , filtration speed 2m / min, cleaning pressure difference 1000Pa, test area 0.0154m 2 , pulse spray interval 5s, tank pressure 0.5MPa, humidity <50%, pulse valve opening time 60ms. The dust removal rate is calculated by the following formula:

[0049]

[0050] Where u is the initial concentration and u0 is the concentration after flue gas treatment.

[0051] The test results are as follows:

[0052] sample temperature Denitrification activity Dust removal rate PM2.5 removal efficiency Example 1 200℃ 83％ 99.4％ 93％

[0053] Example 2

[0054] The preparation method of the multifunctional filter material for dust removal and nitrate removal of the present invention has the following specific process:

[0055] (1) Preparation of active solution

[0056] Step 1: Weigh the precursor (33%), activated coupling agent (23%), cosolvent (6%), stabilizer (5%), and deionized water (33%). The precursor is composed of a certain amount of manganese salt, cerium salt, iron salt, copper salt, cobalt salt, chromium salt, and nitrogen-containing organic matter, with the element molar ratio of Mn / Ce / Fe / Cu / Co / Cr / N = 1:0.5:0.8:0.3:0.2:0.1:0.1. Separately weigh manganese chloride, cerium chloride, ferric chloride, copper sulfate, cobalt sulfate, chromium sulfate, N,N-dimethylformamide, sodium hypochlorite, isopropyl alcohol, polyethylene glycol, and deionized water and mix.

[0057] Step 2: Stir the mixture under magnetic stirring at 200 rpm for 200 minutes at 30°C until the solution is completely mixed to obtain an active solution.

[0058] (2) Pretreatment of filter media substrate

[0059] First, the PE filter material is immersed in anhydrous ethanol and ultrasonically vibrated at 30° C. for 20 minutes; then, the PE filter material is dried at 100° C. for 400 minutes and cooled to obtain a filter material substrate.

[0060] (3) In situ generation of metal-organic framework (MOF) catalytic interfaces

[0061] Step 1: Immerse the treated filter material substrate in the active solution prepared in step (1) and ultrasonically vibrate at 30° C. for 20 minutes.

[0062] Step 2: The filter substrate and active solution were transferred to a reactor, which was then mounted on a rotating stand. The reaction time was set at 150°C for 100 minutes, and the rotation speed was 150 rpm. The filter substrate and active solution reacted in the reactor. After the reactor cooled naturally, a metal-organic framework (MOF) catalytic interface was formed in situ on the filter substrate surface.

[0063] (4) Washing and drying

[0064] Step 1: After the reaction in step (3) is completed, the filter material is taken out, and it is soaked and washed 3 times with aldehyde-free ethanol, and then soaked and washed 3 times with deionized water.

[0065] The second step is drying and shaping, first drying at 80°C for 80 minutes, then heating to 180°C and drying for 150 minutes. Finally, a multifunctional filter material for dust removal and denitrification with a metal-organic framework (MOF) catalytic interface is produced.

[0066] The performance of the prepared composite filter material was tested, NO x , the dust removal rate testing method is the same as that in Example 1.

[0067] The test results are as follows:

[0068] sample temperature Denitrification activity Dust removal rate PM2.5 removal efficiency Example 2 200℃ 85％ 99.5％ 95％

[0069] Example 3

[0070] The preparation method of the multifunctional filter material for dust removal and nitrate removal of the present invention has the following specific process:

[0071] (1) Preparation of active solution

[0072] Step 1: Weigh the precursor (40%), activated coupling agent (30%), cosolvent (10%), stabilizer (6%), and deionized water (14%). The precursor is composed of a certain amount of manganese salt, cerium salt, iron salt, copper salt, cobalt salt, chromium salt, and nitrogen-containing organic matter, with the element molar ratio of Mn / Ce / Fe / Cu / Co / Cr / N = 1:1:1:0.4:0.3:0.2:0.2. Separately weigh manganese nitrate, cerium nitrate, iron nitrate, copper nitrate, cobalt nitrate, chromium nitrate, 1-methyl-2-pyrrolidone, sodium hydroxide, acetone, polylactide, and deionized water and mix.

[0073] Step 2: Magnetic stirring was performed at 500 rpm for 300 minutes at 50°C to completely mix the solution to obtain the active solution.

[0074] (2) Pretreatment of filter media substrate

[0075] First, the P84 filter material is immersed in 5-10% trisodium phosphate and ultrasonically vibrated at 50° C. for 40 minutes; then, the P84 filter material is dried at 150° C. for 500 minutes and cooled to obtain a filter material substrate.

[0076] (3) In situ generation of metal-organic framework (MOF) catalytic interfaces

[0077] Step 1: Immerse the treated filter material substrate in the active solution prepared in step (1) and ultrasonically vibrate at 40° C. for 50 minutes.

[0078] Step 2: The filter substrate and active solution were transferred to a reactor, which was secured to the reactor's rotating stand. The reaction time was set at 300 minutes, the reaction temperature was set at 200°C, and the rotation speed was set at 300 rpm. The filter substrate and active solution reacted in the reactor. After the reactor cooled naturally, a metal-organic framework (MOF) catalytic interface was formed in situ on the filter substrate surface.

[0079] (4) Washing and drying

[0080] Step 1: After the reaction in step (3) is completed, the filter material is taken out, and it is soaked and washed 3 times with anhydrous ethanol, and then soaked and washed 3 times with deionized water.

[0081] The second step is drying and shaping. First, dry at 120℃ for 120 minutes, then heat to 220℃ and dry for 300 minutes. Finally, a multifunctional filter material for dust removal and denitrification with a metal-organic framework (MOF) catalytic interface is obtained. The performance of the prepared composite filter material is tested. x , the dust removal rate testing method is the same as that in Example 1.

[0082] The test results are as follows:

[0083] sample temperature Denitrification activity Dust removal rate PM2.5 removal efficiency Example 3 200℃ 97％ 99.3％ 99％

[0084] Example 4

[0085] The preparation method of the multifunctional filter material for dust removal and nitrate removal of the present invention has the following specific process:

[0086] (1) Preparation of active solution

[0087] Step 1: Weigh the precursor (45%), activated coupling agent (30%), cosolvent (12%), stabilizer (8%), and deionized water (5%). The precursor is composed of a certain amount of manganese salt, cerium salt, iron salt, copper salt, cobalt salt, chromium salt, and nitrogen-containing organic matter, with the element molar ratio of Mn / Ce / Fe / Cu / Co / Cr / N = 1:1.7:1.5:0.5:0.3:0.2:0.2. Separately weigh manganese nitrate, cerium nitrate, iron nitrate, copper nitrate, cobalt nitrate, chromium sulfate, N,N-dimethylformamide, sodium hydroxide, ethyl acetate, methyl methacrylate, and deionized water and mix.

[0088] Step 2: Magnetic stirring was performed at 80°C for 500 minutes at a speed of 700 rpm to completely mix the solution to obtain an active solution.

[0089] (2) Pretreatment of filter media substrate

[0090] First, the Fluorometh filter material is immersed in sodium bicarbonate and ultrasonically vibrated at 80° C. for 50 minutes; then the P84 filter material is dried at 180° C. for 600 minutes and cooled to obtain the filter material substrate.

[0091] (3) In situ generation of metal-organic framework (MOF) catalytic interfaces

[0092] Step 1: Immerse the treated filter material substrate in the active solution prepared in step (1) and ultrasonically vibrate at 75° C. for 120 minutes.

[0093] Step 2: The filter substrate and active solution were transferred to a reactor, which was secured to the reactor's rotating stand. The reaction time was 500 minutes, the reaction temperature was set at 300°C, and the rotation speed was 400 rpm. The filter substrate and active solution reacted in the reactor. After the reactor cooled naturally, a metal-organic framework (MOF) catalytic interface was formed in situ on the filter substrate surface.

[0094] (4) Washing and drying

[0095] Step 1: After the reaction in step (3) is completed, the filter material is taken out, and it is soaked and washed 3 times with aldehyde-free ethanol, and then soaked and washed 3 times with deionized water.

[0096] The second step is drying and shaping, first drying at 150°C for 200 minutes, then heating to 300°C for 500 minutes. Finally, a multifunctional filter material for dust removal and denitrification with a metal-organic framework (MOF) catalytic interface is produced.

[0097] The performance of the prepared composite filter material was tested, NO x , the dust removal rate test method is the same as implementation 1.

[0098] The test results are as follows:

[0099] sample temperature Denitrification activity Dust removal rate PM2.5 removal efficiency Example 4 200℃ 90％ 99.1％ 92％

[0100] Comparative Example 1

[0101] The preparation method of the multifunctional filter material for dust removal and nitrate removal of the present invention has the following specific process:

[0102] (1) Preparation of active solution

[0103] Step 1: Weigh activated coupling agent (30%), cosolvent (10%), stabilizer (6%) and deionized water (54%), and weigh sodium hydroxide, acetone, polylactide and deionized water respectively and mix them.

[0104] Step 2: Magnetic stirring was performed at 500 rpm for 300 minutes at 50°C to completely mix the solution to obtain the active solution.

[0105] (2) Pretreatment of filter media substrate

[0106] First, the P84 filter material is immersed in 5-10% trisodium phosphate and ultrasonically vibrated at 50° C. for 40 minutes; then, the P84 filter material is dried at 150° C. for 500 minutes and cooled to obtain a filter material substrate.

[0107] (3) In situ generation of metal-organic framework (MOF) catalytic interfaces

[0108] Step 1: Immerse the treated filter material substrate in the active solution prepared in step (1) and ultrasonically vibrate at 40° C. for 50 minutes.

[0109] Step 2: The filter substrate and active solution were transferred to a reactor, which was secured to the reactor's rotating stand. The reaction time was set at 300 minutes, the reaction temperature was set at 200°C, and the rotation speed was set at 300 rpm. The filter substrate and active solution reacted in the reactor. After the reactor cooled naturally, a metal-organic framework (MOF) catalytic interface was formed in situ on the filter substrate surface.

[0110] (4) Washing and drying

[0111] Step 1: After the reaction in step (3) is completed, the filter material is taken out, and it is soaked and washed 3 times with anhydrous ethanol, and then soaked and washed 3 times with deionized water.

[0112] The second step is drying and shaping. First, dry at 120℃ for 120 minutes, then heat to 220℃ and dry for 300 minutes. Finally, a multifunctional filter material for dust removal and denitrification with a metal-organic framework (MOF) catalytic interface is obtained. The performance of the prepared composite filter material is tested. x , the dust removal rate testing method is the same as that in Example 1.

[0113] The test results are as follows:

[0114] sample temperature Denitrification activity Dust removal rate PM2.5 removal efficiency Comparative Example 1 200℃ 6％ 90％ 99％

[0115] Comparative Example 2

[0116] The preparation method of the multifunctional filter material for dust removal and nitrate removal of the present invention has the following specific process:

[0117] (1) Preparation of active solution

[0118] Step 1: Weigh the precursor (40%), cosolvent (10%), stabilizer (6%), and deionized water (44%). The precursor is composed of a certain amount of manganese salt, cerium salt, iron salt, copper salt, cobalt salt, chromium salt, and nitrogen-containing organic matter, with the element molar ratio of Mn / Ce / Fe / Cu / Co / Cr / N = 1:1:1:0.4:0.3:0.2:0.2. Separately weigh manganese nitrate, cerium nitrate, iron nitrate, copper nitrate, cobalt nitrate, chromium nitrate, 1-methyl-2-pyrrolidone, acetone, polylactide, and deionized water and mix.

[0119] Step 2: Magnetic stirring was performed at 500 rpm for 300 minutes at 50°C to completely mix the solution to obtain the active solution.

[0120] (2) Pretreatment of filter media substrate

[0121] First, the P84 filter material is immersed in 5-10% trisodium phosphate and ultrasonically vibrated at 50° C. for 40 minutes; then, the P84 filter material is dried at 150° C. for 500 minutes and cooled to obtain a filter material substrate.

[0122] (3) In situ generation of metal-organic framework (MOF) catalytic interfaces

[0123] Step 1: Immerse the treated filter material substrate in the active solution prepared in step (1) and ultrasonically vibrate at 40° C. for 50 minutes.

[0124] Step 2: The filter substrate and active solution were transferred to a reactor, which was secured to the reactor's rotating stand. The reaction time was set at 300 minutes, the reaction temperature was set at 200°C, and the rotation speed was set at 300 rpm. The filter substrate and active solution reacted in the reactor. After the reactor cooled naturally, a metal-organic framework (MOF) catalytic interface was formed in situ on the filter substrate surface.

[0125] (4) Washing and drying

[0126] Step 1: After the reaction in step (3) is completed, the filter material is taken out, and it is soaked and washed 3 times with anhydrous ethanol, and then soaked and washed 3 times with deionized water.

[0127] The second step is drying and shaping. First, dry at 120℃ for 120 minutes, then heat to 220℃ and dry for 300 minutes. Finally, a multifunctional filter material for dust removal and denitrification with a metal-organic framework (MOF) catalytic interface is obtained. The performance of the prepared composite filter material is tested. x , the dust removal rate testing method is the same as that in Example 1.

[0128] The test results are as follows:

[0129] sample temperature Denitrification activity Dust removal rate PM2.5 removal efficiency Comparative Example 2 200℃ 83％ 94.3％ 99％

[0130] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0131] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. A method for preparing a multifunctional filter material for dust removal and denitrification, characterized in that: The preparation method comprises the following steps: (1) Prepare active solution: Mix the precursor, activated coupling agent, cosolvent, stabilizer and deionized water in a container and stir continuously for 120-600 minutes at 20-80°C to prepare active solution for use; (2) Pre-treat the filter material substrate: immerse the filter material substrate in the treatment solution, shake at 20-80°C for 5-50 minutes; then dry the filter material substrate at 80-180°C for 300-600 minutes; (3) In-situ formation of metal-organic framework catalytic interface: immerse the treated filter substrate in the active solution and shake it at a temperature of 20-75°C for 10-120 minutes; then move the filter substrate and the active solution into the reactor for reaction; after the reaction, the metal-organic framework catalytic interface is in-situ formed on the surface of the filter substrate; (4) Washing and drying: After the reaction in step (3) is completed, the filter material substrate is taken out, washed with washing liquid A and washing liquid B for multiple times, and then dried and shaped to finally obtain a dust removal and denitrification multifunctional filter material with a metal-organic framework catalytic interface; The active solution comprises the following components by mass percentage: Precursor 25-45%, Activated coupling agent 20-35%, Cosolvent 5-12%, Stabilizer 4-8%, Deionized water 10-45%; The precursor is composed of manganese salt, cerium salt, iron salt, copper salt, cobalt salt, chromium salt and nitrogen-containing organic matter; The molar ratio of Mn / Ce / Fe / Cu / Co / Cr / N elements in the precursor is 1: (0.1-1.7): (0.1-1.5): (0.1-0.5): (0.1-0.3): (0.1-0.2): (0.1-0.2); The activated coupling agent is at least one of sodium hydroxide and sodium hypochlorite; the cosolvent is at least one of isopropyl alcohol, acetone, and ethyl acetate; the stabilizer is at least one of polyethylene glycol, polylactide, and methyl methacrylate; The drying conditions in step (4) are: first drying at 60-150°C for 30-200 minutes, then heating to 151-300°C and drying for 60-500 minutes.

2. The preparation method according to claim 1, wherein: The manganese salt is at least one of manganese sulfate, manganese chloride, and manganese nitrate solutions; the cerium salt is at least one of cerium sulfate, cerium chloride, and cerium nitrate; the iron salt is at least one of ferric sulfate, ferric chloride, and ferric nitrate solutions; the copper salt is at least one of copper sulfate and copper nitrate solutions; the cobalt salt is at least one of cobalt sulfate and cobalt nitrate solutions; the chromium salt is at least one of chromium sulfate and chromium nitrate solutions; and the nitrogen-containing organic compound is at least one of 1-methyl-2-pyrrolidone and N,N-dimethylformamide.

3. The preparation method according to claim 1, wherein: The filter material substrate in step (2) is one of PPS fiber filter material, PE filter material, aromatic polyamide fiber filter material, PTFE fiber filter material, glass fiber filter material, P84 filter material or Fluorometh filter material; the treatment solution in step (2) is one of anhydrous ethanol, 5-10% trisodium phosphate, and sodium bicarbonate.

4. The preparation method according to claim 1, wherein: The step of moving the filter material substrate and the active solution into the reactor for reaction in step (3) is as follows: moving the filter material substrate and the active solution together into the reactor with a polytetrafluoroethylene lining; The reactor is fixed on the rotating support of the reactor and a certain reaction temperature and rotation speed are set; The reaction time of the filter material substrate and the active solution in the reactor is 30-1500 minutes, the reaction temperature is set at 100-300° C., and the rotation speed of the rotating bracket is 50-500 revolutions per minute.

5. The preparation method according to claim 1, wherein: In step (4), detergent A is one of anhydrous ethanol and aldehyde-free ethanol, and detergent B is deionized water. The specific steps of washing in step (4) are: first, soaking and washing with detergent A for 3 times to solidify the metal-organic framework; then soaking and washing with detergent B for 3 times to remove surface impurities.

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