CN111068619A - Composite material for adsorbing volatile organic compounds and preparation method thereof - Google Patents
Composite material for adsorbing volatile organic compounds and preparation method thereof Download PDFInfo
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- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
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- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
- B01J20/3202—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the carrier, support or substrate used for impregnation or coating
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Abstract
The invention discloses a composite material for adsorbing volatile organic compounds and a preparation method thereof. The composite material comprises a porous carrier framework and an adsorption coating coated on the surface of the porous carrier framework, and the preparation raw material of the porous carrier framework comprises at least one of silicon carbide, silicon dioxide, ferric oxide, aluminum oxide and manganese dioxide. The technical scheme of the invention can reduce energy conversion and conduction links and reduce energy consumption.
Description
Technical Field
The invention relates to the technical field of volatile organic compound adsorption, in particular to a composite material for adsorbing volatile organic compounds and a preparation method thereof.
Background
Volatile Organic Compounds (VOCs) are a common class of Organic Compounds, and usually adopt combustion technologies of rate concentration, catalytic combustion and waste heat recycling. The zeolite adsorption characteristic is utilized to absorb and intercept VOCs and desorb the VOCs through small air quantity hot air, so that waste gas airflow with small air quantity and high concentration is formed and conveyed to an incineration device or a catalytic oxidation device at the rear end for destruction, and the waste gas is discharged to reach the standard. However, because the traditional heating mode using air as a heat transfer medium is adopted, energy conversion and conduction links are multiple, the utilization rate is not high, and a large amount of heat energy is wasted along with the exhaust of tail gas, which is a main reason for limiting the practical popularization and application of the combustion technology.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a composite material for adsorbing volatile organic compounds and a preparation method thereof, aiming at reducing energy conversion and conduction links and reducing energy consumption.
In order to achieve the purpose, the composite material for adsorbing the volatile organic compound comprises a porous carrier framework and an adsorption coating coated on the surface of the porous carrier framework, wherein a preparation raw material of the porous carrier framework comprises at least one of silicon carbide, silicon dioxide, ferric oxide, aluminum oxide and manganese dioxide.
Optionally, the raw material for preparing the adsorption coating comprises at least one of zeolite, activated carbon, carbon fiber and blast furnace slag.
Optionally, the mass of the adsorbent coating is 10% to 25% of the mass of the porous support matrix.
Optionally, the raw material for preparing the porous carrier skeleton and/or the raw material for preparing the adsorption coating further comprises a binder.
Optionally, the adhesive is selected from at least one of acrylamide, modified starch, methyl cellulose, silica sol, aluminum sol, silicon-aluminum sol and titanium sol.
The invention also provides a preparation method of the composite material for adsorbing the volatile organic compounds, which comprises the following steps:
preparing a porous carrier skeleton, wherein the raw materials for preparing the porous carrier skeleton comprise at least one of silicon carbide, silicon dioxide, ferric oxide, aluminum oxide and manganese dioxide;
and coating the slurry of the adsorption coating on the surface of the porous carrier skeleton, and drying to obtain the composite material.
Optionally, the raw materials for preparing the porous carrier skeleton include silicon carbide, silicon dioxide, ferric oxide, aluminum oxide and manganese dioxide, and in the step of preparing the porous carrier skeleton, the method includes:
mixing silicon carbide, silicon dioxide, ferric oxide, aluminum oxide and manganese dioxide to obtain a first mixture;
mixing the hydrochloric acid solution with water to obtain a second mixture;
and mixing the first mixture and the second mixture, mixing, aging, extruding and drying to obtain the porous carrier skeleton.
Optionally, the slurry of the adsorption coating is prepared by the following steps:
adding the raw materials for preparing the adsorption coating into a citric acid solution, adding a dispersing agent, and stirring to obtain the slurry of the adsorption coating.
Optionally, the dispersing agent is at least one selected from the group consisting of ethylene glycol, polyethylene glycol, butylene glycol, isobutanol, glycerol, ethylene glycol butyl ether, propylene glycol monomethyl ether, fatty alcohol-polyoxyethylene ether, tween-20, polyurethane, modified polyurethane, polyacrylate, polycarboxylate, acrylate, modified polyacrylate, organosiloxane, polyether-modified organosiloxane, polyester-modified organosiloxane, and cellulose.
Optionally, in the step of preparing the porous support skeleton, further comprising: adding an adhesive into a preparation raw material of a porous carrier skeleton; and/or, in the step of coating the surface of the porous carrier skeleton with the slurry of the adsorption coating, the method further comprises the following steps: and adding a binder into the slurry of the adsorption coating.
According to the technical scheme, the composite material takes a porous carrier framework as a carrier, an adsorption coating is coated on the surface of the porous carrier framework, and the preparation raw material of the porous carrier framework comprises at least one of silicon carbide, silicon dioxide, ferric oxide, aluminum oxide and manganese dioxide. Therefore, the composite material disclosed by the invention has the wave-absorbing temperature-rising characteristic and the volatile organic compound adsorption characteristic, realizes the synchronous in-situ operation of high-efficiency selective adsorption and wave-absorbing temperature-rising desorption of the volatile organic compound, reduces energy conversion and conduction links, reduces the energy consumption, and further improves the practical energy-saving effect of the thermal incineration or catalytic combustion technology of the volatile organic compound.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a composite material for adsorbing volatile organic compounds, which comprises a porous carrier framework and an adsorption coating coated on the surface of the porous carrier framework, wherein the preparation raw material of the porous carrier framework comprises at least one of silicon carbide, silicon dioxide, ferric oxide, aluminum oxide and manganese dioxide.
The silicon carbide, the silicon dioxide, the ferric oxide, the aluminum oxide and the manganese dioxide all have the wave-absorbing temperature-rising characteristic, one or more of the materials are used as preparation raw materials of a porous carrier framework, the prepared porous carrier framework is used as a carrier, and an adsorption coating is coated on the surface of the porous carrier framework and used for adsorbing volatile organic compounds, so that the finally prepared composite material has the wave-absorbing temperature-rising characteristic and also has the characteristic of adsorbing the volatile organic compounds. The carrier has a porous structure, and the adsorption coating can be distributed on the outer surface of the porous carrier skeleton or embedded in the wall surface of the pores of the porous carrier skeleton.
Therefore, it can be understood that in the technical scheme of the invention, the composite material takes the porous carrier framework as a carrier, the surface of the porous carrier framework is coated with the adsorption coating, and the preparation raw material of the porous carrier framework comprises at least one of silicon carbide, silicon dioxide, ferric oxide, aluminum oxide and manganese dioxide. Therefore, the composite material disclosed by the invention has the wave-absorbing temperature-rising characteristic and the volatile organic compound adsorption characteristic, realizes the synchronous in-situ operation of high-efficiency selective adsorption and wave-absorbing temperature-rising desorption of the volatile organic compound, reduces energy conversion and conduction links, reduces the energy consumption, and further improves the practical energy-saving effect of the thermal incineration or catalytic combustion technology of the volatile organic compound.
Optionally, the raw material for preparing the adsorption coating comprises at least one of zeolite, activated carbon, carbon fiber and blast furnace slag.
The effective components of zeolite, activated carbon, carbon fiber and blast furnace slag are silicon oxide and aluminum oxide, and all of them can efficiently adsorb volatile organic compounds. When the adsorption coating is prepared, the raw materials for preparing the adsorption layer comprise one or more mixtures thereof. The zeolite is preferably a hydrophobic zeolite, which is generally treated by hydrothermal reaction and can adsorb volatile organic compounds more effectively.
It should be noted that the ratio of the porous carrier skeleton to the adsorption coating in the composite material can affect the adsorption property and the wave-absorbing temperature-rising property, so the ratio of the porous carrier skeleton to the adsorption coating needs to be strictly controlled, so that the adsorption property and the wave-absorbing temperature-rising property are both better. Typically, the mass of the adsorbent coating is 10% to 25% of the mass of the porous support framework, such as 10%, 15%, 20% or 25% of the mass of the adsorbent coating.
Further, in order to more firmly adhere the adsorption coating to the surface of the porous carrier skeleton, a binder is further included in the raw materials for preparing the porous carrier skeleton and/or the adsorption coating. The adhesive is added into the preparation raw materials of the porous carrier framework, or the adhesive is added into the preparation raw materials of the adsorption coating, or the preparation raw materials of the adsorption coating and the preparation raw materials of the porous carrier framework, so that the adsorption coating can be firmly adhered to the surface of the porous carrier framework, and the stability and the reliability of the adsorption characteristic of the composite material are ensured.
Optionally, the adhesive is selected from at least one of acrylamide, modified starch, methyl cellulose, silica sol, aluminum sol, silicon-aluminum sol and titanium sol. Acrylamide, modified starch and methyl cellulose are used as organic binders, and are generally added to the raw materials for preparing the porous carrier skeleton. The adhesives of silica sol, aluminum sol, silicon-aluminum sol and titanium sol are all temperature-resistant inorganic adhesives, and are generally added into preparation raw materials of an adsorption coating, so that the adsorption coating can be firmly adhered to the surface of a porous carrier framework. One or more mixtures of these sols may be selected when a binder is selected.
The invention also provides a preparation method of the composite material for adsorbing the volatile organic compounds, which comprises the following steps:
preparing a porous carrier skeleton, wherein the preparation raw material of the porous carrier skeleton comprises at least one of silicon carbide, silicon dioxide, ferric oxide, aluminum oxide and manganese dioxide;
and coating the slurry of the adsorption coating on the surface of the porous carrier skeleton, and drying to obtain the composite material.
One or more of silicon carbide, silicon dioxide, ferric oxide, aluminum oxide and manganese dioxide are selected as raw materials for preparing the porous carrier skeleton, so that the porous carrier skeleton has the characteristics of absorbing waves and raising the temperature. And then coating the slurry of the adsorption coating on the outer surface and/or the inner hole wall surface of the prepared porous carrier skeleton, wherein the slurry of the adsorption coating is prepared from the preparation raw material of the adsorption coating. And then drying the composite material by hot air at the temperature of 100-200 ℃ for 10-60 min, and then transferring the dried composite material to air at the temperature of 350-550 ℃ for roasting for 3-5h to obtain the composite material. It should be noted that, when coating the slurry of the adsorption layer, vacuum coating is generally adopted, and vacuum purging is adopted, so as to make the slurry uniformly distributed, and to purge out the excess slurry in the pore channels, so that a uniform adsorption coating can be obtained, and the pore channels are not blocked.
The composite material has wave-absorbing and temperature-rising characteristics and volatile organic compound adsorption characteristics, realizes synchronous in-situ operation of high-efficiency selective adsorption and wave-absorbing temperature-rising desorption of the volatile organic compounds, reduces energy conversion and conduction links, reduces energy consumption, and further improves the practical energy-saving effect of the thermal incineration or catalytic combustion technology of the volatile organic compounds. In addition, the preparation method of the composite material is simple to operate, the raw materials are easy to obtain, and the cost is low.
In an embodiment of the present invention, the raw materials for preparing the porous carrier skeleton include silicon carbide, silicon dioxide, iron sesquioxide, aluminum oxide and manganese dioxide, and in the step of preparing the porous carrier skeleton, the method includes:
mixing silicon carbide, silicon dioxide, ferric oxide, aluminum oxide and manganese dioxide to obtain a first mixture;
mixing the hydrochloric acid solution with water to obtain a second mixture;
and mixing the first mixture and the second mixture, mixing, aging, extruding and drying to obtain the porous carrier skeleton.
In this embodiment, silicon carbide, silicon dioxide, iron sesquioxide, aluminum oxide and manganese dioxide are used as raw materials for preparing the porous carrier skeleton, and the specific preparation process is as follows:
firstly, according to the parts by mass, 45-55 parts of 80-mesh silicon carbide, 1-5 parts of 80-100-mesh silicon dioxide, 1-5 parts of 80-100-mesh aluminum oxide, 1-2 parts of 120-mesh ferric oxide and 0.1-1 part of 80-mesh manganese dioxide are weighed. Then mixing the raw materials, and uniformly stirring to obtain a first mixture. And then, mixing 25-30 parts by mass of a 2% -5% hydrochloric acid solution and 70-80 parts by mass of water to obtain a second mixture. And then mixing the first mixture and the second mixture, stirring until the mixture is uniformly mixed, transferring the mixed slurry to a mixing mill, mixing for 2-3 h, taking out, and aging at room temperature for 24-36 h. And extruding the aged slurry into a blank with a regular honeycomb structure, and naturally drying the blank at room temperature for 24 hours to obtain a dry porous carrier framework which is of a porous honeycomb structure.
In one embodiment of the present invention, the slurry for the adsorption coating is prepared by the following steps:
and adding the preparation raw materials of the adsorption coating into a citric acid solution, adding a dispersing agent, and performing ball milling to obtain coating slurry.
The raw material for preparing the adsorption coating is an adsorption material which mainly comprises at least one of zeolite, activated carbon, carbon fiber and blast furnace slag. Specifically, 5L-20L of deionized water is weighed firstly, heated to 40 ℃ to 80 ℃, and slowly added with 10g-30g, stirred until the deionized water is completely dissolved, so as to prepare the citric acid solution with the molar concentration of 0.01 mol/L. And then sequentially adding 140-160 parts of adsorbing material and 1-1.5 parts of dispersing agent into the prepared citric acid solution, and continuously performing ball milling for 1-3 h to obtain coating slurry. It should be noted that the dispersant is added to better disperse the adsorbent material to obtain a uniformly distributed coating slurry.
Optionally, the dispersing agent is at least one selected from the group consisting of ethylene glycol, polyethylene glycol, butylene glycol, isobutanol, glycerol, ethylene glycol butyl ether, propylene glycol monomethyl ether, fatty alcohol-polyoxyethylene ether, tween-20, polyurethane, modified polyurethane, polyacrylate, polycarboxylate, acrylate, modified polyacrylate, organosiloxane, polyether-modified organosiloxane, polyester-modified organosiloxane, and cellulose.
Further, in the step of preparing the porous support skeleton, further comprising: adding adhesive into the raw material for preparing the porous carrier skeleton.
The addition of the adhesive can firmly adhere the adsorption coating to the surface of the porous carrier skeleton so as to ensure the stability and reliability of the adsorption characteristic of the composite material. It should be noted that, the adhesive is generally selected from acrylamide, modified starch and methylcellulose, wherein the acrylamide and the modified starch are powder and are generally added into the first mixture, and the methylcellulose is liquid and is generally added into the second mixture, which facilitates dispersion of the adhesive, so that the adhesive properties of the prepared porous carrier skeleton are kept consistent, and further consistency, stability and reliability of the adsorption properties of the composite material are more effectively ensured.
Further, the step of coating the surface of the porous carrier skeleton with the slurry of the adsorption coating further comprises: and adding a binder into the slurry of the adsorption coating.
The adhesive is one or more of silica sol, aluminum sol, silicon-aluminum sol and titanium sol, and after the adhesive is added, the adsorption coating can be more firmly adhered to the surface of the porous carrier skeleton, so that the stability and reliability of the adsorption characteristic of the composite material are ensured.
It should be noted that, here, the binder may be added to both the raw material for preparing the porous carrier skeleton and the slurry of the adsorption coating layer, so as to effectively ensure that the adsorption coating layer is more firmly adhered to the surface of the porous carrier skeleton, and further ensure the stability and reliability of the adsorption characteristic of the composite material.
Therefore, it can be understood that the composite material is prepared through the process steps of mechanical kneading, aging, ball milling, vacuum coating, high-temperature sintering and the like, the method is simple, the composite material is suitable for extrusion forming by equipment, the honeycomb ceramic carrier is high in mechanical lightness, and the raw materials are easy to obtain and low in cost.
Hereinafter, the composite material for adsorbing volatile organic compounds and the method for preparing the same according to the present invention will be described in detail with reference to specific examples.
Example 1
(1) Preparation of a porous carrier skeleton: firstly, weighing 45 parts of 80-mesh silicon carbide, 1 part of 80-100-mesh silicon dioxide, 5 parts of 80-100-mesh aluminum oxide, 5 parts of methyl cellulose, 1 part of 120-mesh ferric oxide, 1 part of 80-mesh manganese dioxide, 2 parts of acrylamide, 6 parts of modified starch, 80 parts of water and 28 parts of hydrochloric acid solution with the mass concentration of 3%; then uniformly mixing the weighed silicon carbide powder, silicon dioxide, ferric oxide, aluminum oxide, manganese dioxide, acrylamide and modified starch to obtain a first mixture; then, adding the weighed methyl cellulose and hydrochloric acid solution into water, and uniformly stirring to obtain a second mixture; and then mixing the first mixture and the second mixture, stirring until the mixture is uniform, transferring the uniformly mixed slurry into a mixing roll for mixing for 2h, taking out the slurry, aging the slurry at room temperature for 36h, extruding the slurry into a blank with a regular honeycomb structure, and naturally drying the blank at room temperature for 24h to obtain the porous carrier framework.
(2) Preparation of slurry of the adsorption coating: weighing 10L of deionized water, heating to 40 ℃, slowly adding 20g of citric acid, stirring for 1h until the citric acid is completely dissolved, and preparing a citric acid solution with the molar concentration of 0.01mol/L for later use; taking 140 parts of hydrophobic molecular sieve zeolite subjected to hydrothermal reaction treatment, 15 parts of binder and 1.5 parts of dispersing agent according to parts by mass, sequentially adding the hydrophobic molecular sieve zeolite, the binder and the dispersing agent into 5L of citric acid solution, and continuously performing ball milling for 3 hours to obtain slurry of the hydrophobic zeolite coating, namely the slurry of the adsorption coating. Wherein the binder is a mixture of 10 parts by mass of silica sol and 5 parts by mass of aluminum sol; the dispersing agent is a mixture of 1 part by mass of polyether modified organic siloxane and 0.5 part by mass of cellulose.
(3) Preparing a composite material: and (3) carrying out vacuum coating on the porous carrier skeleton obtained in the step (1) for 10min by using the slurry prepared in the step (2), repeating the coating step for 5 times, taking out, carrying out hot air drying at 200 ℃ for 30min, and roasting in air at 400 ℃ for 4h to obtain the composite material.
Example 2
(1) Preparation of a porous carrier skeleton: firstly, weighing 55 parts of 80-mesh silicon carbide, 1 part of 80-100-mesh silicon dioxide, 1 part of 80-100-mesh aluminum oxide, 8 parts of methyl cellulose, 2 parts of 120-mesh ferric oxide, 1 part of 80-mesh manganese dioxide, 3 parts of acrylamide, 5 parts of modified starch, 75 parts of water and 30 parts of hydrochloric acid solution with the mass concentration of 3% according to the parts by mass; then uniformly mixing the weighed silicon carbide powder, silicon dioxide, ferric oxide, aluminum oxide, manganese dioxide, acrylamide and modified starch to obtain a first mixture; then adding the weighed methyl cellulose and hydrochloric acid solution into water, and uniformly stirring to obtain a second mixture; then mixing the first mixture and the second mixture, stirring until the mixture is uniform, transferring the uniformly mixed slurry to a mixing roll for mixing for 2 hours, taking out the slurry, and aging at room temperature for 24 hours; and aging, extruding to obtain a green body with a regular honeycomb structure, and naturally drying the green body at room temperature for 36 hours to obtain the porous carrier framework.
(2) Preparation of slurry of the adsorption coating: weighing 10L of deionized water, heating to 80 ℃, slowly adding 20g of citric acid, stirring for 0.5h until the citric acid is completely dissolved, and preparing a citric acid solution with the molar concentration of 0.01mol/L for later use; taking 150 parts of hydrophobic molecular sieve zeolite subjected to hydrothermal reaction treatment, 20 parts of binder and 1.5 parts of dispersant according to parts by mass, sequentially adding the mixture into 8L of citric acid solution, and continuously performing ball milling for 2 hours to obtain hydrophobic zeolite coating slurry, namely the slurry of the adsorption coating. Wherein, the adhesive is 20 parts by mass of silicon-aluminum sol; the dispersing agent is a mixture of 0.8 part by mass of fatty alcohol-polyoxyethylene ether and 0.7 part by mass of organosiloxane.
(3) Preparing a composite material: and (3) carrying out vacuum coating on the porous carrier skeleton obtained in the step (1) for 10min by using the slurry prepared in the step (2), repeating the coating step for 5 times, taking out, carrying out hot air drying at 200 ℃ for 30min, and roasting in air at 400 ℃ for 4h to obtain the composite material.
Example 3
(1) Preparation of a porous carrier skeleton: firstly, weighing 55 parts of 80-mesh silicon carbide, 1 part of 80-100-mesh silicon dioxide, 1 part of 80-100-mesh aluminum oxide, 10 parts of methyl cellulose, 2 parts of 120-mesh ferric oxide, 0.5 part of 80-mesh manganese dioxide, 2 parts of acrylamide, 8 parts of modified starch, 75 parts of water and 25 parts of hydrochloric acid solution with the mass concentration of 3% according to the parts by mass; then uniformly mixing the weighed silicon carbide powder, silicon dioxide, ferric oxide, aluminum oxide, manganese dioxide, acrylamide and modified starch to obtain a first mixture; then adding the weighed methyl cellulose and hydrochloric acid solution into water, and uniformly stirring to obtain a second mixture; and then mixing the first mixture and the second mixture, stirring until the mixture is uniform, transferring the uniformly mixed slurry into a mixing roll for mixing for 2h, taking out the slurry, aging the slurry at room temperature for 36h, extruding the slurry into a blank with a regular honeycomb structure, and naturally drying the blank at room temperature for 24h to obtain the porous carrier framework.
(2) Preparation of slurry of the adsorption coating: weighing 10L of deionized water, heating to 60 ℃, slowly adding 20g of citric acid, stirring for 0.5h until the citric acid is completely dissolved, and preparing a citric acid solution with the molar concentration of 0.01mol/L for later use; weighing 140 parts of hydrophobic molecular sieve zeolite obtained through hydrothermal reaction treatment, 20 parts of binder and 1.5 parts of dispersant according to the mass parts, sequentially adding the mixture into 8L of citric acid solution, and continuously performing ball milling for 3 hours to obtain hydrophobic zeolite coating slurry, namely the slurry of the adsorption coating. Wherein, the adhesive is 20 parts by mass of silicon-aluminum sol; the dispersing agent is a mixture of 0.8 part by mass of fatty alcohol-polyoxyethylene ether and 0.7 part by mass of organosiloxane.
(3) Preparing a composite material: and (3) carrying out vacuum coating on the porous carrier skeleton obtained in the step (1) for 10min by using the slurry prepared in the step (2), repeating the coating step for 5 times, taking out, carrying out hot air drying at 200 ℃ for 60min, and roasting in air at 550 ℃ for 3h to obtain the composite material.
Example 4
(1) Preparation of a porous carrier skeleton: firstly, weighing 50 parts of 80-mesh silicon carbide, 3 parts of 80-100-mesh silicon dioxide, 2 parts of 80-100-mesh aluminum oxide, 6 parts of methyl cellulose, 1 part of 120-mesh ferric oxide, 1 part of 80-mesh manganese dioxide, 2 parts of acrylamide, 5 parts of modified starch, 80 parts of water and 20 parts of hydrochloric acid solution with the mass concentration of 3% according to the parts by mass; then uniformly mixing the weighed silicon carbide powder, silicon dioxide, ferric oxide, aluminum oxide, manganese dioxide, acrylamide and modified starch to obtain a first mixture; then adding methyl cellulose and hydrochloric acid solution into water, and uniformly stirring to obtain a second mixture; and then mixing the first mixture and the second mixture, stirring until the mixture is uniform, transferring the uniformly mixed slurry into a mixing roll for mixing for 2h, taking out the slurry, aging the slurry at room temperature for 30h, extruding the slurry into a blank with a regular honeycomb structure, and naturally drying the blank at room temperature for 24h to obtain the porous carrier framework.
(2) Preparation of slurry of the adsorption coating: weighing 10L of deionized water, heating to 4 ℃, slowly adding 20g of citric acid, stirring for 1h until the citric acid is completely dissolved, and preparing a citric acid solution with the molar concentration of 0.01mol/L for later use; and then weighing 150 parts of hydrophobic molecular sieve zeolite, 18 parts of binder and 1 part of dispersant which are obtained by hydrothermal reaction treatment according to the mass parts, sequentially adding the hydrophobic molecular sieve zeolite, the binder and the dispersant into 10L of citric acid solution, and continuously performing ball milling for 2 hours to obtain hydrophobic zeolite coating slurry, namely the slurry of the adsorption coating. Wherein the adhesive is 18 parts of silicon-aluminum sol by mass; the dispersant is a mixture of 0.5 part by mass of polyether modified organic siloxane and 0.5 part by mass of cellulose.
(3) Preparing a composite material: and (3) carrying out vacuum coating on the porous carrier skeleton obtained in the step (1) for 10min by using the slurry prepared in the step (2), repeating the coating step for 5 times, taking out, carrying out hot air drying at 200 ℃ for 30min, and roasting in air at 400 ℃ for 4h to obtain the composite material.
Firstly, the composite materials prepared in examples 1 to 4 are subjected to a wave-absorbing temperature-rising experimental test, and the test results are as follows: the total area of the irradiation distance of the 1.5kw magnetron of 0.2m is 0.25m2The composite material of (1) can be heated to 200-230 ℃ from room temperature (25 ℃) within 15-25 min; the total area of the magnetron irradiation distance of 0.2m in 3kw.h is 0.25m2The composite material of (1) can be heated to 200-230 ℃ from room temperature (25 ℃) within 15-20 min; the total area of the magnetron irradiation distance of 0.3m is 0.25m in 3kw.h2The composite material of (2) can be heated from room temperature (25 ℃) to 180-200 ℃ within 15-20 min. Therefore, the composite material prepared by the invention has better wave-absorbing and temperature-rising characteristics.
Meanwhile, the composite materials prepared in examples 1 to 4 were tested in VOC adsorption performance experiments, and the specific test results were as follows:
the concentration is 150-250mg/m3(80% toluene, 15% ethanol, other types V)OC accounts for 5%) of the mixed VOC waste gas, and the total overfire area is 0.25m when the wind speed is 1m/s2And when the mass transfer height is 0.4m, the concentration of VOC discharged from the tail end can be controlled to be 30mg/m3-50mg/m3In the meantime.
The concentration is 200-300mg/m3(80% toluene, 15% ethanol, 5% other types of VOCs) at a wind speed of 1m/s through a total overfire area of 0.25m2And when the mass transfer height is 0.4m, the concentration of VOC discharged from the tail end can be controlled to be 50mg/m3-80mg/m3In the meantime. From this, it can be seen that the composite material of the present invention has a good adsorption property for volatile organic compounds.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the present specification and directly/indirectly applied to other related technical fields within the spirit of the present invention are included in the scope of the present invention.
Claims (10)
1. The composite material for adsorbing the volatile organic compounds is characterized by comprising a porous carrier framework and an adsorption coating coated on the surface of the porous carrier framework, wherein a preparation raw material of the porous carrier framework comprises at least one of silicon carbide, silicon dioxide, ferric oxide, aluminum oxide and manganese dioxide.
2. The composite material for adsorbing volatile organic compounds according to claim 1, wherein the raw material for preparing the adsorption coating layer comprises at least one of zeolite, activated carbon, carbon fiber and blast furnace slag.
3. The composite for adsorbing volatile organic compounds according to claim 1, wherein the mass of said adsorption coating layer is 10% to 25% of the mass of said porous support skeleton.
4. The composite for adsorbing volatile organic compounds according to any one of claims 1 to 3, wherein a binder is further included in a raw material for preparing the porous support skeleton and/or a raw material for preparing the adsorption coating layer.
5. The composite for adsorbing volatile organic compounds according to claim 4, wherein said binder is at least one selected from the group consisting of acrylamide, modified starch, methyl cellulose, silica sol, aluminum sol, silica-alumina sol, and titanium sol.
6. A method for preparing a composite material for adsorbing volatile organic compounds, the method comprising the steps of:
preparing a porous carrier skeleton, wherein the raw materials for preparing the porous carrier skeleton comprise at least one of silicon carbide, silicon dioxide, ferric oxide, aluminum oxide and manganese dioxide;
and coating the slurry of the adsorption coating on the surface of the porous carrier skeleton, and drying to obtain the composite material.
7. The method according to claim 6, wherein the raw material for preparing the porous support skeleton comprises silicon carbide, silicon dioxide, iron trioxide, aluminum oxide and manganese dioxide, and the step of preparing the porous support skeleton comprises:
mixing silicon carbide, silicon dioxide, ferric oxide, aluminum oxide and manganese dioxide to obtain a first mixture;
mixing the hydrochloric acid solution with water to obtain a second mixture;
and mixing the first mixture and the second mixture, mixing, aging, extruding and drying to obtain the porous carrier skeleton.
8. The method of claim 6, wherein the slurry of the adsorption coating is prepared by the steps of:
adding the raw materials for preparing the adsorption coating into a citric acid solution, adding a dispersing agent, and stirring to obtain the slurry of the adsorption coating.
9. The method of claim 8, wherein the dispersant is at least one selected from the group consisting of ethylene glycol, polyethylene glycol, butylene glycol, isobutanol, glycerol, ethylene glycol butyl ether, propylene glycol monomethyl ether, fatty alcohol polyoxyethylene ether, tween-20, polyurethane, modified polyurethane, polyacrylate, polycarboxylate, acrylate, modified polyacrylate, organosiloxane, polyether-modified organosiloxane, polyester-modified organosiloxane, and cellulose.
10. The method for producing a composite material for adsorbing volatile organic compounds according to any one of claims 6 to 9, further comprising, in the step of preparing the porous support skeleton:
adding an adhesive into a preparation raw material of a porous carrier skeleton;
and/or, in the step of coating the surface of the porous carrier skeleton with the slurry of the adsorption coating, the method further comprises the following steps:
and adding a binder into the slurry of the adsorption coating.
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