CN115770440A - Air filter element material, preparation method thereof and air filter element - Google Patents
Air filter element material, preparation method thereof and air filter element Download PDFInfo
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Abstract
The invention discloses an air filter element material, a preparation method thereof and an air filter element, wherein the method comprises the following steps: 1) Pretreating a molecular sieve; 2) Adding the mixture into a NaCl solution, soaking under ultrasonic waves, filtering, washing with deionized water, then adding the mixture into an ethanol water solution, and stirring to obtain a molecular sieve suspension; 3) Adding the functional additive into the molecular sieve suspension, stirring, reacting under heating, filtering, and drying the solid product; 4) Calcining and grinding the product obtained in the step 3) to obtain the air filter element material. The air filter element material provided by the invention takes the molecular sieve with a porous structure as a base materialBy loading Rh @ MnO on molecular sieve 2 ‑La 2 The O composite active particles endow the air filter element material with extremely strong oxidative decomposition and purification effects on gas pollutants, so that the air filter element material has the functions of physical adsorption and chemical purification of polluted gases, and the air purification effect of the filter element material can be remarkably improved.
Description
Technical Field
The invention relates to the field of filter materials, and particularly relates to an air filter element material, a preparation method thereof and an air filter element.
Background
In the times of today's high economic development, the situation of air pollution is also becoming more and more serious, and pollutants in the air include gaseous pollutants (sulfur oxides, nitrogen oxides, organic compounds VOCs, etc.) present in a molecular state in addition to suspended particles present in an aerosol state. Therefore, air purification, especially indoor air purification, is important for human health, and is currently widely implemented by air purifiers, in which a filter element is a key material, and activated carbon is a traditional air filter element material, for example, an activated carbon air filter element and a preparation method thereof disclosed in patent CN103463868B, but activated carbon has limited porosity and is easily saturated by adsorption. The molecular sieve has high void volume and strong stability, and has been widely used as an air filter element material at present, for example, a functional ceramic fiber air filter element disclosed in patent CN110465136A and a preparation method thereof, an air purification filter element based on glass fiber and alumina fiber framework disclosed in patent CN106902574B and a preparation method and application thereof, a preparation method of an indoor air purification filter element disclosed in patent CN108786295A, and the like. The traditional molecular sieve air filter core material mainly realizes purification through physical adsorption, so that the removal rate of organic compounds such as ammonia nitrogen, formaldehyde and the like is poor, and the requirements of users are difficult to meet. Therefore, there is a need for improvements in the art to provide a more reliable solution.
Disclosure of Invention
The invention aims to solve the technical problem of providing an air filter element material, a preparation method thereof and an air filter element aiming at the defects in the prior art.
In order to solve the technical problems, the invention adopts the technical scheme that: a preparation method of an air filter element material comprises the following steps:
1) Calcining the molecular sieve, cooling, adding the molecular sieve into a hydrochloric acid solution for soaking, filtering, and washing with deionized water to be neutral to obtain a pretreated molecular sieve;
2) Adding the pretreated molecular sieve into a NaCl solution, soaking under ultrasound, filtering, washing with deionized water, then adding into an ethanol water solution, and stirring to obtain a molecular sieve suspension;
3) Adding the functional additive into the molecular sieve suspension, stirring, reacting under heating, filtering, and drying the solid product;
4) Calcining and grinding the product obtained in the step 3) to obtain the air filter element material.
Preferably, the functional additives include: an ethanol solution of manganese acetate, an ethanol solution of lanthanum nitrate and an n-hexane solution of tetrachiorohm dodecacarbonyl.
Preferably, the step 1) is specifically: calcining a molecular sieve with the particle size of 2-20 microns at 240-350 ℃ for 1-4h, cooling, adding the molecular sieve into a hydrochloric acid solution with the mass concentration of 5-25%, soaking for 1-5h, filtering, and washing with deionized water to be neutral to obtain a pretreated molecular sieve;
the molecular sieve is an X-type, Y-type or ZSM-5 molecular sieve.
Preferably, the step 2) is specifically: adding the pretreated molecular sieve into 0.2-2mol/L NaCl solution, soaking for 0.5-3h under ultrasonic, filtering, washing with deionized water, adding into ethanol water solution, and stirring for 15-60min to obtain molecular sieve suspension;
wherein the volume ratio of ethanol to water in the ethanol aqueous solution is 1.
Preferably, the step 3) is specifically: adding the functional additive into the molecular sieve suspension, stirring for 5-45min, reacting at 140-250 deg.C under 0.5-1.8MPa for 8-16h, filtering, and vacuum drying the solid product;
the functional additives include: ethanol solution of manganese acetate with the concentration of 10-65mg/mL, ethanol solution of lanthanum nitrate with the concentration of 2-16mg/mL and n-hexane solution of dodecacarbonyl tetrarhodium with the concentration of 0.1-1.5 mg/mL.
Preferably, in the step 3), the addition amount of manganese acetate is 45-150% of the molecular sieve, the addition amount of lanthanum nitrate is 3-28% of the molecular sieve, and the addition amount of tetracarbonyl dodecarhodium is 0.05-2.2% of the molecular sieve according to the mass ratio.
Preferably, the step 4) is specifically: calcining the product obtained in the step 3) at 400-580 ℃ for 2-6h, and grinding to obtain the air filter element material.
Preferably, the preparation method of the air filter element material comprises the following steps:
1) Calcining a ZSM-5 molecular sieve with the particle size of 5-10 mu m at 320 ℃ for 2h, cooling, adding the calcined molecular sieve into a hydrochloric acid solution with the mass concentration of 10%, soaking for 3h, filtering, and washing with deionized water to be neutral to obtain a pretreated molecular sieve;
2) Adding the pretreated molecular sieve into 0.5mol/L NaCl solution, soaking for 2h under ultrasound, filtering, washing with deionized water, then adding into ethanol water solution, and stirring for 45min to obtain molecular sieve suspension; wherein the volume ratio of ethanol to water in the ethanol aqueous solution is 1.
3) Adding the functional additive into the molecular sieve suspension, stirring for 30min, reacting for 10h at 220 ℃ and 1.2MPa, filtering, and vacuum-drying the solid product;
the functional additives include: an ethanol solution of manganese acetate with the concentration of 45mg/mL, an ethanol solution of lanthanum nitrate with the concentration of 10mg/mL and an n-hexane solution of dodecacarbonyltetrarhodium with the concentration of 0.5 mg/mL;
wherein, according to the mass ratio, the addition amount of manganese acetate is 135 percent of the molecular sieve, the addition amount of lanthanum nitrate is 12 percent of the molecular sieve, and the addition amount of dodecacarbonyl tetrarhodium is 0.1 percent of the molecular sieve;
4) Calcining the product obtained in the step 3) at 450 ℃ for 4h, and grinding to obtain the air filter element material.
The invention also provides an air filter element material which is prepared by the method.
The invention also provides an air filter element, which comprises a filter element main body and the air filter element material filled in the filter element main body;
the filter core main part includes the filter screen that the multilayer interval set up, forms the intermediate layer between the adjacent filter screen, the air filter core material is filled in the intermediate layer.
The beneficial effects of the invention are:
the air filter element material provided by the invention takes a molecular sieve with a porous structure as a base material, and Rh @ MnO with strong oxidation and catalytic activity on ammonia nitrogen and TVOC gas is loaded on the molecular sieve 2 -La 2 The O composite active particles endow the air filter element material with extremely strong oxidative decomposition and purification effects on gas pollutants, so that the air filter element material has the functions of physical adsorption and chemical purification of polluted gases, and the air purification effect of the filter element material can be remarkably improved;
rh @ MnO in the present invention 2 -La 2 O 3 Transition metal oxide MnO of the composite active particles 2 Is a catalytic active component and has catalytic oxidation activity on formaldehyde, ammonia nitrogen gas and the like; the rhodium with the valence of +6 has high oxidation potential and strong oxidizing property, is an active component for oxidizing and degrading ammonia nitrogen and TVOC gas, and can greatly enhance the purifying effect of the filter element material on ammonia nitrogen and TVOC gas pollutants; wherein, rare earth lanthanum has high affinity to oxygen and ammonia nitrogen, on one hand, the adsorption effect to ammonia nitrogen is improved, and on the other hand, the adsorption effect to ammonia nitrogen is improved by increasing Rh @ MnO 2 -La 2 O 3 The oxygen content on the surface of the composite active particles can be obviously increased, thereby the MnO can be obviously improved 2 The catalytic oxidation activity and the oxidation activity of rhodium are improved, so that the performance of oxidizing and degrading the polluted gas of the whole composite active particles is improved, and in the process of forming the composite active particles, the rare earth lanthanum can also promote the uniform dispersion of the noble metal rhodium in the particles, so that the strong oxidation effect of the rhodium can be fully exerted.
Drawings
Fig. 1 is a schematic structural view of an air filter in embodiment 4 of the present invention;
FIG. 2 shows the results of ammonia removal;
FIG. 3 shows the results of the test for formaldehyde removal;
description of the reference numerals:
1-a filter element main body; 2, filtering the filter screen.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
The test methods used in the following examples are all conventional methods unless otherwise specified. The material reagents and the like used in the following examples are commercially available unless otherwise specified. The following examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The invention provides a preparation method of an air filter element material, which comprises the following steps:
1) Calcining the molecular sieve with the particle size of 2-20 microns at 240-350 ℃ for 1-4h, cooling, adding the calcined molecular sieve into a hydrochloric acid solution with the mass concentration of 5-25%, soaking for 1-5h, filtering, and washing with deionized water to be neutral to obtain the pretreated molecular sieve.
2) Adding the pretreated molecular sieve into 0.2-2mol/L NaCl solution, soaking for 0.5-3h under ultrasound, filtering, washing with deionized water, adding into ethanol water solution, and stirring for 15-60min to obtain molecular sieve suspension;
wherein the volume ratio of ethanol to water in the ethanol aqueous solution is 1.
3) Adding the functional additive into the molecular sieve suspension, stirring for 5-45min, reacting at 140-250 deg.C under 0.5-1.8MPa for 8-16h, filtering, and vacuum drying the solid product;
the functional additives include: ethanol solution of manganese acetate with the concentration of 10-65mg/mL, ethanol solution of lanthanum nitrate with the concentration of 2-16mg/mL and n-hexane solution of dodecacarbonyl tetrarhodium with the concentration of 0.1-1.5 mg/mL;
wherein, according to the mass ratio, the addition amount of manganese acetate is 45-150% of the molecular sieve, the addition amount of lanthanum nitrate is 3-28% of the molecular sieve, and the addition amount of dodecacarbonyl tetrarhodium is 0.05-2.2% of the molecular sieve.
4) Calcining the product obtained in the step 3) at 400-580 ℃ for 2-6h, and grinding to obtain the air filter element material.
In the invention, the molecular sieve with a porous structure is used as an adsorption base material, and multiple gas pollutants have high adsorption activity; the invention can remove partial impurities and bound water in pores by calcining the molecular sieve, then can further remove the impurities by soaking in hydrochloric acid, and can remove the impurities by H + The cation on the molecular sieve can be replaced, the electronegativity of the molecular sieve can be increased, the adsorption capacity of the molecular sieve on the cation is improved, on one hand, the subsequent loading of functional ions is facilitated, and on the other hand, the adsorption capacity of the molecular sieve on ammonia nitrogen compounds can be improved; then soaking in NaCl, allowing passage of Na + Replacement of H + And then, when a functional additive is added, mn 2+ 、La 3+ And Rh 6+ And H + Can cause Mn to react 2+ 、La 3 、Rh 6+ Loading on a molecular sieve; in the process, the surface of the molecular sieve has rich hydroxyl, mn 2+ 、La 3+ And Rh 6+ Can be firmly connected to the molecular sieve through coordination with hydroxyl; finally, high-temperature calcination is carried out to form doped Rh on the molecular sieve 6+ MnO of 2 -La 2 O 3 Composite active particles: rh @ MnO 2 -La 2 O 3 The composite active particles have strong oxidation and catalytic activity on ammonia nitrogen gas and TVOC gas, so that the chemical decomposition and removal of the polluted gas are realized; and the MnO can be ensured by the generated gases such as water vapor, carbon dioxide and the like in the pyrolysis process 2 Form a porous structure, and play a role in increasing the specific surface area and the adsorption capacity
In Rh @ MnO 2 -La 2 O 3 Transition metal oxide MnO of the composite active particles 2 As a catalytically active component, having catalytic oxidation activity on formaldehyde, ammonia nitrogen gas, etc., e.g., mnO 2 The lattice surface has movable oxygen atoms, and after the rest formaldehyde is contacted, the formaldehyde can be converted into harmless carbon dioxide and water, so that the purification is realized; wherein, the rhodium with the valence of +6 has high oxidation potential and strong oxidizing property and is an active component for oxidizing and degrading ammonia nitrogen and TVOC gasThe purification effect of the filter element material on ammonia nitrogen and TVOC gas pollutants can be greatly enhanced; wherein, rare earth lanthanum has high affinity to oxygen and ammonia nitrogen, on the one hand, the adsorption effect on the ammonia nitrogen is improved, and on the other hand, the adsorption effect is improved by increasing Rh @ MnO 2 -La 2 O 3 The oxygen content on the surface of the composite active particles can be obviously increased, thereby the MnO can be obviously improved 2 The catalytic oxidation activity and the oxidation activity of rhodium, thereby improving the performance of the composite active particles for oxidizing and degrading the polluted gas, and in the process of forming the composite active particles, the rare earth lanthanum can also promote the uniform dispersion of the noble metal rhodium in the particles so as to fully exert the strong oxidation effect of the rhodium, so that the composite active particles are subjected to the catalytic oxidation activity and the oxidation activity of the rhodium, and the composite active particles are subjected to the catalytic oxidation activity and the oxidation activity of the rhodium, so that the composite active particles are subjected to the catalytic oxidation activity and the oxidation activity of the rhodium 2 -La 2 O 3 The formation of the composite active particle structure system enables Rh, mn and La to play a role in coordination and enhancement, and endows the air filter element material with extremely strong oxidative decomposition and purification effects on ammonia nitrogen and TVOC gas pollutants, so that the air filter element material has the functions of physical adsorption and chemical purification of polluted gases.
The invention also provides an air filter element material which is prepared by the method.
The invention also provides an air filter element, which comprises a filter element main body and the air filter element material filled in the filter element main body;
the filter core main part includes the filter screen that the multilayer interval set up, forms the intermediate layer between the adjacent filter screen, and the air filter core material is filled in the intermediate layer.
Example 1
A preparation method of an air filter element material comprises the following steps:
1) Calcining a ZSM-5 molecular sieve (Shanghai cloud environmental protection science and technology Co., ltd.) with the particle size of 5-10 μm at 320 ℃ for 2h, cooling, adding the calcined molecular sieve into a hydrochloric acid solution with the mass concentration of 10%, soaking for 3h, filtering, and washing the solution to be neutral by using deionized water to obtain a pretreated molecular sieve;
2) Adding the pretreated molecular sieve into 0.5mol/L NaCl solution, soaking for 2h under ultrasound, filtering, washing with deionized water, adding into ethanol water solution, and stirring for 45min to obtain molecular sieve suspension; wherein the volume ratio of ethanol to water in the ethanol aqueous solution is 1.
3) Adding the functional additive into the molecular sieve suspension, stirring for 30min, reacting for 10h at 220 ℃ and 1.2MPa, filtering, and vacuum-drying the solid product;
the functional additives include: an ethanol solution of manganese acetate with the concentration of 45mg/mL, an ethanol solution of lanthanum nitrate with the concentration of 10mg/mL and an n-hexane solution of dodecacarbonyltetrarhodium with the concentration of 0.5 mg/mL;
wherein, according to the mass ratio, the addition amount of manganese acetate is 135 percent of the molecular sieve, the addition amount of lanthanum nitrate is 12 percent of the molecular sieve, and the addition amount of dodecacarbonyl tetrarhodium is 0.1 percent of the molecular sieve;
4) Calcining the product obtained in the step 3) at 450 ℃ for 4h, and grinding to obtain the air filter element material.
Example 2
A preparation method of an air filter element material comprises the following steps:
1) Calcining a ZSM-5 molecular sieve (Shanghai cloud-environment protection science and technology Co., ltd.) with the particle size of 5-10 μm at 320 ℃ for 2h, cooling, adding the calcined molecular sieve into a hydrochloric acid solution with the mass concentration of 10%, soaking for 3h, filtering, and washing with deionized water to be neutral to obtain a pretreated molecular sieve;
2) Adding the pretreated molecular sieve into 0.5mol/L NaCl solution, soaking for 2h under ultrasound, filtering, washing with deionized water, adding into ethanol water solution, and stirring for 45min to obtain molecular sieve suspension; wherein the volume ratio of ethanol to water in the ethanol aqueous solution is 1.
3) Adding the functional additive into the molecular sieve suspension, stirring for 30min, reacting for 10h at 220 ℃ and 1.2MPa, filtering, and vacuum-drying the solid product;
the functional additives include: a manganese acetate ethanol solution with the concentration of 45mg/mL, a lanthanum nitrate ethanol solution with the concentration of 10mg/mL and a dodecane carbonyltetrarhodium n-hexane solution with the concentration of 0.5 mg/mL;
wherein, according to the mass ratio, the addition amount of manganese acetate is 80 percent of the molecular sieve, the addition amount of lanthanum nitrate is 10 percent of the molecular sieve, and the addition amount of dodecacarbonyl tetrarhodium is 0.08 percent of the molecular sieve;
4) Calcining the product obtained in the step 3) at 450 ℃ for 4h, and grinding to obtain the air filter element material.
Example 3
A preparation method of an air filter element material comprises the following steps:
1) Calcining a ZSM-5 molecular sieve (Shanghai cloud-environment protection science and technology Co., ltd.) with the particle size of 5-10 μm at 320 ℃ for 2h, cooling, adding the calcined molecular sieve into a hydrochloric acid solution with the mass concentration of 10%, soaking for 3h, filtering, and washing with deionized water to be neutral to obtain a pretreated molecular sieve;
2) Adding the pretreated molecular sieve into 0.5mol/L NaCl solution, soaking for 2h under ultrasound, filtering, washing with deionized water, adding into ethanol water solution, and stirring for 45min to obtain molecular sieve suspension; wherein the volume ratio of ethanol to water in the ethanol aqueous solution is 1.
3) Adding the functional additive into the molecular sieve suspension, stirring for 30min, reacting for 10h at 220 ℃ and 1.2MPa, filtering, and vacuum-drying the solid product;
the functional additives include: an ethanol solution of manganese acetate with the concentration of 45mg/mL, an ethanol solution of lanthanum nitrate with the concentration of 10mg/mL and an n-hexane solution of dodecacarbonyltetrarhodium with the concentration of 0.5 mg/mL;
wherein, according to the mass ratio, the addition amount of manganese acetate is 160 percent of the molecular sieve, the addition amount of lanthanum nitrate is 15 percent of the molecular sieve, and the addition amount of dodecacarbonyl tetrarhodium is 0.14 percent of the molecular sieve;
4) Calcining the product obtained in the step 3) at 450 ℃ for 4h, and grinding to obtain the air filter element material.
Example 4
An air filter element comprises a filter element main body and an air filter element material filled in the filter element main body; the air filter element material was prepared by the method of example 1;
referring to fig. 1 (2 layers of filter screens are illustrated), the filter cartridge body 1 comprises a plurality of layers of filter screens 10 arranged at intervals, an interlayer is formed between adjacent filter screens 10, and air filter element material is filled in the interlayer.
Comparative example 1
A preparation method of an air filter element material comprises the following steps: calcining a ZSM-5 molecular sieve (Shanghai cloud environmental protection science and technology Co., ltd.) with the particle size of 5-10 μm at 320 ℃ for 2h, cooling, adding the calcined molecular sieve into a hydrochloric acid solution with the mass concentration of 10%, soaking for 3h, filtering, and washing with deionized water to be neutral to obtain the treated molecular sieve, namely the air filter element material.
Comparative example 2
A preparation method of an air filter element material comprises the following steps:
1) Calcining a ZSM-5 molecular sieve (Shanghai cloud environmental protection science and technology Co., ltd.) with the particle size of 5-10 μm at 320 ℃ for 2h, cooling, adding the calcined molecular sieve into a hydrochloric acid solution with the mass concentration of 10%, soaking for 3h, filtering, and washing the solution to be neutral by using deionized water to obtain a pretreated molecular sieve;
2) Adding the pretreated molecular sieve into 0.5mol/L NaCl solution, soaking for 2 hours under ultrasonic, filtering, washing with deionized water, then adding into ethanol water solution, and stirring for 45min to obtain molecular sieve suspension; wherein the volume ratio of ethanol to water in the ethanol aqueous solution is 1.
3) Adding the functional additive into the molecular sieve suspension, stirring for 30min, reacting for 10h at 220 ℃ and 1.2MPa, filtering, and vacuum-drying the solid product;
the functional additives include: the ethanol solution of manganese acetate with the concentration of 45mg/mL and the ethanol solution of lanthanum nitrate with the concentration of 10 mg/mL;
wherein, according to the mass ratio, the addition amount of manganese acetate is 135 percent of the molecular sieve, and the addition amount of lanthanum nitrate is 12 percent of the molecular sieve;
4) Calcining the product obtained in the step 3) at 450 ℃ for 4h, and grinding to obtain the air filter element material.
Comparative example 3
A preparation method of an air filter element material comprises the following steps:
1) Calcining a ZSM-5 molecular sieve (Shanghai cloud environmental protection science and technology Co., ltd.) with the particle size of 5-10 μm at 320 ℃ for 2h, cooling, adding the calcined molecular sieve into a hydrochloric acid solution with the mass concentration of 10%, soaking for 3h, filtering, and washing the solution to be neutral by using deionized water to obtain a pretreated molecular sieve;
2) Adding the pretreated molecular sieve into 0.5mol/L NaCl solution, soaking for 2h under ultrasound, filtering, washing with deionized water, adding into ethanol water solution, and stirring for 45min to obtain molecular sieve suspension; wherein the volume ratio of ethanol to water in the ethanol aqueous solution is 1.
3) Adding the functional additive into the molecular sieve suspension, stirring for 30min, reacting for 10h at 220 ℃ and 1.2MPa, filtering, and vacuum-drying the solid product;
the functional additives include: an ethanol solution of manganese acetate with the concentration of 45mg/mL and an n-hexane solution of dodecacarbonyl tetrarhodium with the concentration of 0.5 mg/mL;
wherein, according to the mass ratio, the addition amount of the manganese acetate is 135 percent of the molecular sieve, and the addition amount of the dodecacarbonyl tetrarhodium is 0.1 percent of the molecular sieve;
4) Calcining the product obtained in the step 3) at 450 ℃ for 4h, and grinding to obtain the air filter element material.
The filter materials prepared in examples 1-3 and comparative examples 1-3 were made into air filter cartridges, and then the air filter cartridges were tested for removal of formaldehyde and ammonia from a mixture of gases with reference to standard GBT18801-2015, wherein the filter material was packed into a sandwich of two-layer screens to give a rectangular air filter cartridge sample of 200mm x 300mm and 150mm thickness with a mixture of gases of: NH (NH) 4 15wt%、O 2 22wt%、CH 2 O8 wt% and the balance N 2 (ii) a Test for 90minNH 4 、CH 2 The O removal rate and the test results are shown in table 1 below, fig. 2, and fig. 3.
TABLE 1
| Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 | |
| NH 4 Removal rate%, 90min | 98.4 | 96.2 | 98.9 | 67.2 | 84.3 | 88.4 |
| CH 2 O removal rate%, 90min | 97.6 | 95.1 | 98.0 | 61.6 | 81.9 | 85.0 |
As can be seen from the results of Table 1 and FIGS. 2 and 3, the filter element materials of examples 1 to 3 are NH 4 、CH 2 O all shows excellent removal effect, and the air filter element material adopted in the comparative example 1 is the unmodified Rh @ MnO 2 -La 2 O 3 Molecular sieves with composite active particles which rely primarily on physical adsorption for NH removal 4 、CH 2 O, so the removal rate is low; the composite active particles in comparative example 2 were not doped with rhodium having high oxidation activity, resulting in oxidative removal of NH 4 、CH 2 The effect of O is reduced; the composite active particles in comparative example 3, to which no rare earth lanthanum was added, affected MnO 2 Catalytic oxidation activity of (2) and of rhodiumThe oxidation activity is exerted, resulting in a decrease in the removal rate.
While embodiments of the invention have been disclosed above, it is not intended to be limited to the details shown in the description and the examples, which are set forth, but are fully applicable to various fields of endeavor as are suited to the particular use contemplated, and further modifications will readily occur to those skilled in the art, since the invention is not limited to the details shown and described without departing from the general concept as defined by the appended claims and their equivalents.
Claims (10)
1. A preparation method of an air filter element material is characterized by comprising the following steps:
1) Calcining the molecular sieve, cooling, adding the molecular sieve into a hydrochloric acid solution for soaking, filtering, and washing with deionized water to be neutral to obtain a pretreated molecular sieve;
2) Adding the pretreated molecular sieve into a NaCl solution, soaking under ultrasound, filtering, washing with deionized water, then adding into an ethanol water solution, and stirring to obtain a molecular sieve suspension;
3) Adding the functional additive into the molecular sieve suspension, stirring, reacting under heating, filtering, and drying the solid product;
4) Calcining and grinding the product obtained in the step 3) to obtain the air filter element material.
2. A method of making an air filter material according to claim 1, wherein the functional additive comprises: an ethanol solution of manganese acetate, an ethanol solution of lanthanum nitrate and an n-hexane solution of tetracarbonyldodecarhodium.
3. The method for preparing an air filter element material according to claim 2, wherein the step 1) is specifically: calcining a molecular sieve with the particle size of 2-20 microns at 240-350 ℃ for 1-4h, cooling, adding the molecular sieve into a hydrochloric acid solution with the mass concentration of 5-25%, soaking for 1-5h, filtering, and washing with deionized water to be neutral to obtain a pretreated molecular sieve;
the molecular sieve is an X-type, Y-type or ZSM-5 molecular sieve.
4. A method of making an air filter element material according to claim 3, wherein step 2) specifically comprises: adding the pretreated molecular sieve into 0.2-2mol/L NaCl solution, soaking for 0.5-3h under ultrasonic, filtering, washing with deionized water, adding into ethanol water solution, and stirring for 15-60min to obtain molecular sieve suspension;
wherein the volume ratio of ethanol to water in the ethanol aqueous solution is 1.
5. A method of making an air filter element material according to claim 4, wherein the step 3) is specifically: adding the functional additive into the molecular sieve suspension, stirring for 5-45min, reacting at 140-250 deg.C and 0.5-1.8MPa for 8-16h, filtering, and vacuum drying the solid product;
the functional additives include: ethanol solution of manganese acetate with the concentration of 10-65mg/mL, ethanol solution of lanthanum nitrate with the concentration of 2-16mg/mL and n-hexane solution of dodecacarbonyltetrarhodium with the concentration of 0.1-1.5 mg/mL.
6. The preparation method of the air filter element material according to claim 5, wherein in the step 3), according to the mass ratio, the addition amount of manganese acetate is 45-150% of the molecular sieve, the addition amount of lanthanum nitrate is 3-28% of the molecular sieve, and the addition amount of tetrachioride dodecacarbonyl is 0.05-2.2% of the molecular sieve.
7. The method for preparing an air filter element material according to claim 6, wherein the step 4) is specifically: calcining the product obtained in the step 3) at 400-580 ℃ for 2-6h, and grinding to obtain the air filter element material.
8. A method of making an air filter element material according to claim 7, comprising the steps of:
1) Calcining a ZSM-5 molecular sieve with the particle size of 5-10 mu m at 320 ℃ for 2h, cooling, adding the calcined molecular sieve into a hydrochloric acid solution with the mass concentration of 10%, soaking for 3h, filtering, and washing with deionized water to be neutral to obtain a pretreated molecular sieve;
2) Adding the pretreated molecular sieve into 0.5mol/L NaCl solution, soaking for 2h under ultrasound, filtering, washing with deionized water, then adding into ethanol water solution, and stirring for 45min to obtain molecular sieve suspension; wherein the volume ratio of ethanol to water in the ethanol water solution is 1;
3) Adding the functional additive into the molecular sieve suspension, stirring for 30min, reacting for 10h at 220 ℃ and 1.2MPa, filtering, and vacuum-drying the solid product;
the functional additives include: a manganese acetate ethanol solution with the concentration of 45mg/mL, a lanthanum nitrate ethanol solution with the concentration of 10mg/mL and a dodecane carbonyltetrarhodium n-hexane solution with the concentration of 0.5 mg/mL;
wherein, according to the mass ratio, the addition amount of manganese acetate is 135 percent of the molecular sieve, the addition amount of lanthanum nitrate is 12 percent of the molecular sieve, and the addition amount of dodecacarbonyl tetrarhodium is 0.1 percent of the molecular sieve;
4) Calcining the product obtained in the step 3) at 450 ℃ for 4h, and grinding to obtain the air filter element material.
9. An air filter material prepared by the method of any one of claims 1-7.
10. An air filter cartridge, wherein the cartridge comprises a cartridge body and the air filter cartridge material of claim 8 packed within the cartridge body;
the filter core main part includes the filter screen that the multilayer interval set up, forms the intermediate layer between the adjacent filter screen, the air filter core material is filled in the intermediate layer.
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