CN211436220U - Porous section containing nano adsorbent for VOCs treatment and detection equipment - Google Patents
Porous section containing nano adsorbent for VOCs treatment and detection equipment Download PDFInfo
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- CN211436220U CN211436220U CN201920693063.8U CN201920693063U CN211436220U CN 211436220 U CN211436220 U CN 211436220U CN 201920693063 U CN201920693063 U CN 201920693063U CN 211436220 U CN211436220 U CN 211436220U
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Abstract
The utility model provides a porous section bar containing nano adsorbent for VOCs treatment and detection equipment, wherein the porous section bar containing nano adsorbent for VOCs treatment comprises a substrate framework layer and a nano adsorbent adsorption layer; the substrate framework layer is a porous framework section, and the pores of the porous framework section are primary open pore channels; at least one layer of nano adsorbent adsorption layer is arranged on the surface of the substrate framework layer. A porous section bar that contains nanometer adsorbent for VOCs administers, the nanometer adsorbent passes through self-assembling mode and loads porous substrate, and is high at carrier surface coverage, multiplicable VOCs waste gas and nanometer adsorbent area of contact, and then improves nanometer adsorbent and adsorbs desorption efficiency to VOCs.
Description
Technical Field
The utility model belongs to the technical field of air pollution administers, especially, relate to a porous section bar that contains nanometer adsorbent and check out test set for VOCs administers.
Background
Volatile Organic Compounds (VOCs) are a general term for a class of organic pollutants which are ubiquitous and complex in composition in the air, and seriously threaten the health of people. VOCs play an important role in regional composite air pollution characterized by ozone (O3), fine particulate matters (PM2.5) and acid rain, and are one of bottlenecks that restrict sustainable development of socioeconomic performance. The activated carbon adsorption method is the earliest and most extensive treatment means for treating industrial VOCs, but in the practical application process, the activated carbon has the defects of difficult regeneration, large influence of moisture on adsorption performance, easy occurrence of fire in the hot air flow regeneration process when the adsorption is saturated and the like.
In recent years, zeolite runners using zeolite as a main adsorption medium appear, low-concentration VOCs waste gas can be concentrated through continuous adsorption-desorption circulation, and high-concentration VOCs waste gas is treated through catalytic combustion. At present, the core material of the zeolite runner mainly has two modes: one kind of honeycomb zeolite material is prepared with zeolite powder and other additive and through direct extrusion to form. The other method is to use inorganic fiber paper to make a carrier with a honeycomb structure, to dip zeolite raw powder on the surface of a honeycomb channel, and to sinter the zeolite raw powder at high temperature to make the adsorption runner. The first direct forming method for preparing the honeycomb zeolite has the advantages that VOCs adsorption-desorption is efficiently carried out on the surface, the original zeolite powder in the honeycomb zeolite cannot play a role, raw material waste and cost increase are caused, and meanwhile, the honeycomb zeolite is high in density and the manufacturing cost and the operating cost of runner equipment with the same size are increased. The second method is to take honeycomb inorganic fiber as a carrier to prepare honeycomb zeolite by impregnation, wherein raw zeolite powder is unevenly distributed on the surface of the inorganic fiber carrier, the adhesive force is poor, and the problem of dust secondary pollution exists.
Disclosure of Invention
In view of this, the present invention provides a porous section containing nano-adsorbent for treating VOCs, so as to overcome the defects of the prior art, improve the coverage of nano-adsorbent on the surface of the carrier by self-assembly, increase the contact area between the VOCs waste gas and the nano-adsorbent by utilizing the high specific surface area of the porous substrate, and further improve the adsorption and desorption efficiency of the nano-adsorbent on VOCs; through the addition of the secondary pore canal, the air resistance of the porous section is reduced, the gas flow is improved, and the efficient VOCs treatment capacity with large air volume is achieved.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
the porous section containing the nano adsorbent for VOCs treatment comprises a substrate framework layer and a nano adsorbent adsorption layer; the substrate framework layer is a porous framework section, and the pores of the porous framework section are primary open pore channels; at least one layer of nano adsorbent adsorption layer is arranged on the surface of the substrate framework layer.
Furthermore, a plurality of secondary pore channels are formed in the base framework layer, and the secondary pore channels are all through holes.
Further, when the secondary pore channel is formed, the base framework layer is made of melamine foam, foamed nickel, foamed iron and foamed aluminum; preferably, the material of the base framework layer is melamine foam. When the secondary pore passage is not formed, the base framework layer is made of open-cell foam cement.
Furthermore, the adsorbent in the nano adsorbent adsorption layer is one or more than two of molecular sieve, metal organic framework material, modified activated carbon, diatomite, sepiolite, silica aerogel and zeolite.
Furthermore, the aperture size of the primary open pore channel is 0.05-1 mm; the diameter of the secondary pore canal is 2-10 mm; the skeleton diameter of the substrate skeleton layer is 0.005-0.1 mm.
Further, the particle size of the adsorbent in the nano adsorbent adsorption layer is 0.5-20 μm; and a plurality of secondary pore canals are uniformly distributed.
Further, the surface of the substrate framework layer is bonded with the nano adsorbent adsorption layer through a binder.
Further, the binder is one or two of organic silica sol, polytetrafluoroethylene dispersion, attapulgite, kaolin and sepiolite.
Another objective of the present invention is to provide a method for preparing a porous section containing nano-adsorbent for treating VOCs, so as to prepare the above porous section containing nano-adsorbent for treating VOCs.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
a preparation method of a porous section containing a nano adsorbent for VOCs treatment comprises the following steps:
(1) preparing a substrate framework layer containing secondary pore channels: selecting a proper substrate framework layer, and punching holes on the surface of the substrate framework layer in a mechanical punching or laser cutting mode to form a plurality of uniformly distributed secondary pore channels;
(2) forming a nano adsorbent adsorption layer on the surface of the substrate framework layer in a self-assembly mode;
preferably, when the substrate skeleton layer does not contain secondary channels, step (1) may be omitted.
Preferably, in the step (2), the method for forming the nano adsorbent adsorption layer on the surface of the substrate framework layer by a self-assembly mode comprises the following steps:
s1, preparing a self-assembly adsorption solution: mixing anionic polyelectrolyte or cationic polyelectrolyte, inorganic salt and deionized water through ultrasonic stirring to obtain self-assembly adsorption solution; the self-assembly adsorption liquid comprises the following components in percentage by mass: 1-10% of anionic polyelectrolyte or cationic polyelectrolyte, 0.5-10% of inorganic salt and the balance of deionized water; preferably, the inorganic salt is potassium chloride or sodium chloride, the cationic polyelectrolyte is polydiallyldimethylammonium chloride or polyethyleneimine, and the anionic polyelectrolyte is polymethacrylic acid;
s2, soaking the substrate skeleton layer containing the secondary pore canal or not in the self-assembly adsorption liquid for a period of time, taking out and drying at 65-75 ℃ for later use;
s3, preparing a dispersion liquid: sequentially adding the nano adsorbent particles and the adhesive into deionized water, and stirring and ultrasonically dispersing to obtain a dispersion liquid; the mass ratio of the nano adsorbent particles in the dispersion liquid is 5-20%, the mass ratio of the adhesive is 1-5%, and the balance is deionized water;
and S4, immersing the substrate framework layer which is dried and processed in the step S2 and contains the secondary pore channels or the substrate framework layer which does not contain the secondary pore channels into dispersion liquid, taking out the substrate framework layer and drying the substrate framework layer at the temperature of 120 ℃ and 180 ℃ to obtain the porous section containing the nano adsorbent for treating the VOCs.
The invention also relates to equipment for detecting the performance of the porous section containing the nano adsorbent for treating the VOCs, which is used for detecting the effect of the porous section containing the nano adsorbent on the VOCs treatment.
The equipment for detecting the performance of absorbing the VOCs by the porous section containing the nano adsorbent for treating the VOCs comprises a first fan, an air duct heater, a sample bin and a gas generator;
the first fan is communicated with an inlet of the air channel heater through a first pipeline, and an outlet of the air channel heater is communicated with an inlet of the sample bin through a second pipeline; a second concentration test port is arranged on a connecting pipeline of the outlet of the sample bin; the first pipeline is provided with a first flow valve and a first concentration test port, and the first concentration test port is close to the air channel heater; a flowmeter is arranged on the second pipeline;
the air inlet end of the gas generator is communicated with a second fan, and a second flow valve is mounted on the communicating pipeline; the outlet of the gas generator is communicated with the first pipeline, and the communication position is positioned between the first flow valve and the first concentration testing port.
Compared with the prior art, a porous section bar that contains nanometer adsorbent for VOCs administers have following advantage:
a porous section bar that contains nanometer adsorbent for VOCs administers to porous skeleton section bars such as melamine bubble cotton are the carrier, form the adsorption coating with the nanometer adsorbent particle at porous skeleton surface through the self-assembling mode, solve the prior art defect, improve the nanometer adsorbent at carrier surface coverage rate, reinforcing particle and carrier bonding strength increase VOCs waste gas and nanometer adsorbent area of contact, improve the nanometer adsorbent and adsorb desorption efficiency to VOCs. A secondary pore channel structure is constructed on the porous framework sectional materials such as melamine foam and the like, and the secondary pore channel structure is used for reducing gas resistance generated when VOCs-containing waste gas passes through the material and increasing the waste gas passing flow, so that the material processing capacity is improved, and the secondary pore channel structure is suitable for working conditions with large air volume. The melamine material is a fireproof material, can resist temperature of more than 300 ℃, meets the temperature required by desorption in actual working conditions, and avoids smoldering risk.
A preparation method for porous section bar that contains nanometer adsorbent for VOCs administers, improve the load through many times self-assembly mode, improve material adsorption desorption performance. Specifically, the coverage rate of the nano adsorbent particles on the surface of the porous base material skeleton is more than 90 percent, and the content of the nano adsorbent particles in the unit volume section bar is 50-200kg/m3Since the foundation (i.e. the substrate skeleton layer) is of skeleton porous structure, the surface area of the substrate has larger specific surfaceUnder the circumstances of product, better gas permeability still, after the skeleton surface covers nanometer adsorbent particle basically, VOCs waste gas passes through porous pore section bar, can take place to collide many times and be adsorbed with nanometer adsorbent particle fast, because skeleton surface nanometer adsorbent particle is only for the individual layer or several layers cover, can carry out the surface adsorption fast, consequently adsorption efficiency is higher. In the desorption process, hot air passes through the porous channel structure and rapidly reaches the nano adsorbent particles, heat exchange is carried out between the hot air and the nano adsorbent particles, and the temperature of the nano adsorbent particles is raised to complete the desorption of VOCs, so that the porous section has higher desorption efficiency. The adhesive can strengthen the binding force between the nanometer adsorbent particles and the surface of the framework, so that the nanometer adsorbent particles are not easy to fall off.
A detect as above a porous section bar absorption VOCs performance's equipment that contains nanometer adsorbent for VOCs administers, simple structure, convenient operation, the testing result is accurate.
Drawings
FIG. 1 is a schematic diagram of the simple structure of the porous section containing nano-adsorbent (with secondary channels) for VOCs treatment according to the present invention;
FIG. 2 is a schematic representation of the skeletal structure of the substrate of FIG. 1;
FIG. 3 is a surface view of the framework of the nano-adsorbent support substrate of FIG. 2;
fig. 4 is a schematic diagram of the simple structure of the apparatus for detecting the performance of absorbing VOCs by the porous section containing the nano-adsorbent for VOCs remediation according to the present invention.
Reference numerals:
1-a base skeleton layer; 101-a primary opening pore channel; 102-secondary pore canals; 2-a nano-adsorbent adsorption layer; 3-a first fan; 4-air duct heater; 5-a sample bin; 6-a gas generator; 7-a first conduit; 8-a second concentration test port; 9-a first flow valve; 10-a first concentration test port; 11-a second conduit; 12-a flow meter; 13-a second fan; 14-a second flow valve; 15-adsorbent particles.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which this invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
The present invention will be described in detail with reference to the following embodiments and accompanying drawings.
A porous section containing nano adsorbent for VOCs treatment comprises a substrate framework layer 1 and a nano adsorbent adsorption layer 2; the substrate framework layer 1 is a porous framework section, and the substrate framework layer 1 is made of open-cell foam cement, because the foam cement has a large primary pore channel size and good air flow permeability, and a secondary pore channel structure does not need to be prepared. The pores of the porous framework section are primary open pore channels 101. At least one layer of nano adsorbent adsorption layer 2 is arranged on the surface of the substrate framework layer 1.
In some embodiments, the material of the base skeleton layer 1 may be melamine foam, nickel foam, iron foam, aluminum foam, etc., but is preferably melamine foam. At this time, as shown in fig. 1 to 3, a plurality of secondary pore channels 102 need to be formed on the base skeleton layer 1, and the plurality of secondary pore channels 102 are all through holes. It should be noted that the secondary pore arrangement is that the secondary pore channels 102 may be selected according to the magnitude of the resistance of the gas medium passing through the porous profile to be overcome, and the larger the resistance is, the more the number of the secondary pore channels 102 may be set, and conversely, the fewer the secondary pore channels are; in addition, the secondary ducts 102 may be uniformly distributed, and need not be arrayed, but other types of distribution structures are also possible.
As an optional embodiment of the present invention, the adsorbent in the nano adsorbent adsorption layer 2 is one or more of molecular sieve, metal organic framework material, modified activated carbon, diatomite, sepiolite, silica aerogel and zeolite. When zeolite is used, one or more kinds of ZSM-5, 13X, 5A type zeolite are preferable.
As an optional embodiment of the present invention, the pore size of the primary opening pore passage 101 is 0.05-1 mm; the diameter of the secondary pore canal 102 is 2-10 mm; the skeleton diameter of the substrate skeleton layer 1 is 0.005-0.1 mm. The particle size of the adsorbent in the nano adsorbent adsorption layer 2 is 0.5-20 μm.
As an alternative embodiment of the present invention, the surface of the substrate skeleton layer 1 and the nano adsorbent adsorption layer 2 are bonded by a binder. The binder can be one or two of organic silica sol, polytetrafluoroethylene dispersion, attapulgite, kaolin and sepiolite.
The preparation method of the porous section containing the nano adsorbent for VOCs treatment comprises the following steps:
(1) preparing the substrate skeleton layer 1 containing the secondary pore channels 102: selecting a proper substrate framework layer 1, and punching holes on the surface of the substrate framework layer in a mechanical punching or laser cutting mode to form a plurality of uniformly distributed secondary pore channels 102;
(2) forming a nano adsorbent adsorption layer 2 on the surface of the substrate framework layer 1 in a self-assembly mode;
when the base skeleton layer 1 does not include the secondary pore channels 102 (i.e., when the material of the base skeleton layer 1 is open-cell foam cement), the step (1) may be omitted.
In the step (2), the method for forming the nano adsorbent adsorption layer 2 on the surface of the substrate framework layer 1 in a self-assembly mode comprises the following steps:
s1, preparing a self-assembly adsorption solution: mixing anionic polyelectrolyte or cationic polyelectrolyte, inorganic salt and deionized water through ultrasonic stirring to obtain self-assembly adsorption solution; the self-assembly adsorption liquid comprises the following components in percentage by mass: 1-10% of anionic polyelectrolyte or cationic polyelectrolyte, 0.5-10% of inorganic salt and the balance of deionized water; preferably, the inorganic salt is potassium chloride or sodium chloride, the cationic polyelectrolyte is polydiallyldimethylammonium chloride or polyethyleneimine, and the anionic polyelectrolyte is polymethacrylic acid;
s2, soaking the substrate skeleton layer 1 containing the secondary pore canal 102 or the substrate skeleton layer 1 not containing the secondary pore canal 102 in self-assembly adsorption liquid for a period of time, taking out and drying at 65-75 ℃ for later use;
s3, preparing a dispersion liquid: sequentially adding the nano adsorbent particles and the adhesive into deionized water, and stirring and ultrasonically dispersing to obtain a dispersion liquid; the mass ratio of the nano adsorbent particles in the dispersion liquid is 5-20%, the mass ratio of the adhesive is 1-5%, and the balance is deionized water;
and S4, immersing the substrate framework layer 1 containing the secondary pore channels 102 or the substrate framework layer 1 not containing the secondary pore channels 102, which is dried in the step S2, into the dispersion liquid, taking out the substrate framework layer 1 and drying the substrate framework layer at the temperature of 120-180 ℃ to obtain the porous section containing the nano adsorbent for treating the VOCs.
As shown in fig. 4, an apparatus for detecting the performance of absorbing VOCs by the porous section containing the nano-adsorbent for VOCs treatment as described above comprises a first fan 3, an air duct heater 4, a sample chamber 5 and a gas generator 6; the first fan 3 is communicated with an inlet of the air channel heater 4 through a first pipeline 7, and an outlet of the air channel heater 4 is communicated with an inlet of the sample bin 5 through a second pipeline; a second concentration test port 8 is arranged on a connecting pipeline at the outlet of the sample bin 5; a first flow valve 9 and a first concentration test port 10 are arranged on the first pipeline 7, and the first concentration test port 10 is close to the air duct heater 4; a flowmeter 12 is arranged on the second pipeline 11; the air inlet end of the gas generator 6 is communicated with a second fan 13, and a second flow valve 14 is arranged on the communicating pipeline; the outlet of the gas generator 6 is connected to the first pipe 7, and the connection is between the first flow valve 9 and the first concentration test port 10.
It should be noted that the air duct heater is commercially available, the manufacturer is produced by salt city creative electric heating technology limited company, the model is LHKJ-FD-10, and the air blown by the fan 1 and the fan 2 is air. The fan 1 supplies air to a main air duct (namely a first pipeline 7), and the size of the main air volume is controlled by a first flow valve 9; the fan 2 provides carrier gas for the gas generator, the flow rate of the carrier gas is controlled by the second flow valve 14, the gas generator is of a bubbling structure, and particularly, the gas generator is a stainless steel cylinder similar to a wide-mouth bottle, the bottle plug of the gas generator is hermetically connected with the bottle body, two gas guide pipes are inserted on the bottle plug, the lower end of one gas guide pipe is inserted below the liquid level of an organic solvent in the bottle body of the stainless steel cylinder, and the upper end of the gas guide pipe extends out of the bottle plug and is communicated with the fan; the lower end of the other air duct is above the liquid level in the bottle body, and the upper end extends out of the bottle stopper and is communicated with the first pipeline 7. When the carrier gas passes through the organic solvent in the gas generator cabin (namely in the stainless steel cylinder body), the carrier gas carries corresponding VOC molecules to enter the main air duct, and the concentration of VOC with different concentrations is realized as waste gas to be detected by controlling the flow of the carrier gas. The sample bin 5 comprises a shell, a sealing cover and a sample support, and the sample support is vertically arranged in the shell; the top of the shell is in threaded connection with a sealing cover, and an O-shaped sealing ring is sleeved at the joint of the sealing cover and the sealing cover. Two sides of the shell are respectively communicated with the second pipeline 12 and the outlet pipeline of the sample bin, and an O-shaped sealing ring is sleeved at the communication position. During the use, will await measuring porous section bar sample and place between support and casing lateral wall, and await measuring porous section bar sample and sealed lid, casing bottom and perisporium are hugged closely, and the support not only plays the supporting role to the sample that awaits measuring like this, still can prevent that the air current from not getting rid of through the sample that awaits measuring directly, influencing the test result.
The detection working principle of the detection equipment is as follows:
during the absorption, will the utility model discloses the porous section bar of preparation is put in sample storehouse 5 department, and first fan 3 is equivalent to the wind channel, and second fan 13 is equivalent to the pollution source, and during the absorption, under the effect of first fan 3 and second fan 13, volatile VOC of liquid gets into air channel heater 4 (air channel heater 4 closes this moment) in the follow gas generator 6, reentrant sample storehouse 5 flows out at last. The concentration difference measured by the online VOCs monitoring instrument (existing) arranged at the first concentration test port 10 and the second concentration test port 8 in front of and behind the sample bin 5 is the VOCs adsorbed and removed at the sample bin 5. During desorption, the air channel heater 4 is opened, the gas generator 6 is closed, and gas introduced from the first fan 3 is heated to desorb the porous section at the sample bin 5 at high temperature. The gas quantity is large during adsorption, the concentration of VOCs is low, and the time is long; during desorption, the gas flow is small, the time is short, the concentration of VOCs is high (the high concentration is used for meeting the requirement of subsequent combustion), but the theoretical content of the adsorbed and desorbed VOCs is balanced on the whole.
Example 1
The preparation method of the zeolite-containing porous section material with the melamine foam as the base material (namely, the base framework layer 1) comprises the following steps:
a) the melamine foam (typical primary pore size is 0.2mm) is cut into 100 x 50mm size, and holes are punched on the melamine foam through a punching die (pore size is 2mm, and the number of the holes is 25 x 25) to form secondary pore channels 102, so that the melamine foam porous substrate is prepared.
b) Poly (diallyl dimethyl ammonium chloride) cationic polyelectrolyte, potassium chloride and deionized water are mixed according to the mass ratio of 2: 8: 90 preparing 2kg of self-assembly adsorption liquid, and ultrasonically stirring for 15 min.
c) Completely immersing the porous melamine foam base material for 30min, extruding out excessive liquid, and drying in a thermostat at 75 ℃.
d) Preparing 2L of dispersion liquid by high-silicon ZSM-5 zeolite (the particle size is 2-10 mu m), organic silica sol with the solid content of 20% (mass ratio) and deionized water according to the mass ratio of 2:1:17, and ultrasonically stirring for 30min to uniformly disperse.
e) And (3) immersing the dried and cooled base material into the dispersion, and drying in a thermostat at 150 ℃ to obtain the zeolite-containing porous section material taking the melamine foam as the base material (namely the base framework layer 1).
Through independently setting up experiment verification platform (as shown in figure 4), carry out absorption-desorption experiment to the sample of making, select isopropanol as the VOCs test source, initial concentration is 500ppm, guarantees that the clearance 90% time exceeds 30min, and 180 ℃ desorption concentration can reach 1200ppm, from this it can be seen that this type of sample has good VOCs purification, concentration effect. Compared with the common honeycomb zeolite (size 100X 100, pore number 40X 40) samples in the market, under the same test conditions, the removal rate of 90% is only 20min, so that the adsorption performance of the zeolite-containing porous profile taking the melamine foam as the base material is better than that of the market honeycomb zeolite samples.
Comparative example 1 (relative to example 1)
The results of the zeolite-containing porous section without secondary pore channels and using the melamine foam as the base material (namely, the base framework layer 1) are compared:
the sample was prepared in essentially the same manner as in example 1, with the main difference that in step a), the melamine foam substrate was not perforated. And (3) testing the air flow passing through the sample pressure difference by a gas pressure sensor at the front and rear test holes of the sample bin of the self-constructed experimental verification platform (shown in figure 4), so as to represent the air resistance of the sample.
Remarking: the initial flow is the flow when no sample is placed, and the sample flow is the actual flow after the sample is placed.
According to experimental results, the gas resistance of the sample without the secondary hole in the comparative example 1 is high, and the flow rate of the sample passing through the sample is only one tenth of the initial flow rate under the limitation of the maximum static pressure (1Kpa) of the fan, so that the working condition of actual large air volume cannot be met. The sample with the secondary pore passage exists in the example 1, the air resistance is small, the gas flow loss is small, the passing of large air volume can be realized, and the requirement of actual working conditions is met.
Example 2
The preparation method of the porous section containing MOF-177 by using the melamine foam as the base material (namely, the base framework layer 1) comprises the following steps:
a) the melamine foam is cut into the size of 100 × 50mm, and 30 × 30 holes are punched through a punching die (the hole diameter is 1.5mm, the hole number is 30 × 30) to form secondary channels 102, so that the melamine foam porous substrate is prepared.
b) Mixing poly (methacrylic acid) anion polyelectrolyte, sodium chloride and deionized water according to a mass ratio of 1: 6: 93 preparing 2kg of self-assembly adsorption solution, and ultrasonically stirring for 15 min.
c) Completely soaking melamine foam with size of 100 × 50mm in water for 30min, naturally standing for 20min to allow excessive liquid to flow out, and oven drying at 65 deg.C in a thermostat.
d) Preparing 2kg of dispersion liquid by using 13X zeolite (with the particle size of 5-30 mu m), organic silica sol with the solid content of 20%, attapulgite and deionized water according to the mass ratio of 10:5:1:33, and ultrasonically stirring for 30min to uniformly disperse.
e) And (3) immersing the dried and cooled base material into the dispersion liquid, and drying in a thermostat at 180 ℃ to obtain the MOF-177-containing porous section taking the melamine foam as the base material (namely the base framework layer 1).
Through independently setting up experiment verification platform as shown in figure 4, carry out the absorption-desorption experiment to the sample of making, select the isopropyl alcohol to be the VOCs test source, initial concentration is 500ppm, guarantees that the clearance 90% time exceeds 60min, and 180 ℃ desorption concentration can reach 1500ppm, from this it can be seen that this type of sample has good VOCs purification, concentration effect.
Example 3
The preparation method of the modified activated carbon-containing porous section material with the melamine foam as the base material (namely, the base framework layer 1) comprises the following steps:
a) the melamine foam is cut into the size of 100 × 50mm, and 30 × 30 holes are punched through a punching die (the hole diameter is 1.5mm, the hole number is 30 × 30) to form secondary channels 102, so that the melamine foam porous substrate is prepared.
b) Mixing polyethyleneimine cationic polyelectrolyte, ammonium chloride and deionized water according to a mass ratio of 2: 6: 91 preparing 2kg of self-assembly adsorption solution, and ultrasonically stirring for 15 min.
c) Completely soaking melamine foam with size of 100 × 50mm in water for 30min, naturally standing for 20min to allow excessive liquid to flow out, and oven drying at 50 deg.C in a thermostat.
d) Preparing 2kg of dispersion liquid by using dilute nitric acid modified coconut shell activated carbon powder (the particle size is 5-30 mu m, coconut shell activated carbon of environmental protection science and technology limited in Jiangsu Pushida is purchased and then is ground into a required particle size sample), organic silica sol with the solid content of 20%, kaolin and deionized water according to the mass ratio of 10:5:1:33, and ultrasonically stirring for 30min to uniformly disperse.
e) And (3) immersing the dried and cooled base material into the dispersion liquid, and drying in a thermostat at 150 ℃ to obtain the modified activated carbon-containing porous section material taking the melamine foam as the base material (namely the substrate framework layer 1).
Through independently setting up experiment verification platform as shown in figure 4, carry out the absorption-desorption experiment to the sample of making, select the isopropyl alcohol for use as the VOCs test source, initial concentration is 500ppm, guarantees that the clearance 90% time exceeds 20min, and 180 ℃ desorption concentration can reach 1200ppm, and it is relatively poor that zeolite and organic framework nanoparticle compare from this to see the purification effect of this kind of sample VOCs and concentration effect. The reason is that the pore size of the activated carbon is relatively dispersed, so that the pore channels with the size capable of adsorbing VOCs occupy less space, and efficient VOCs gas adsorption cannot be realized. Because the modified activated carbon has low cost, the material can be used for the working condition of low concentration of VOCs.
Example 4
The preparation method of the zeolite (ZSM-5) -containing porous section material taking foam cement as a base material (namely the base framework layer 1) comprises the following steps:
the foam cement is selected as the through-hole foam cement, and due to process limitation, the foam cement has large primary pore passage size and good air flow permeability, and a secondary pore passage structure does not need to be prepared. Other preparation conditions were the same as in example 1. And the foam cement framework structure has low density, so that the zeolite particle loading is small, and the effect of the finished product of the material is tested. Isopropanol is selected as a VOCs test source, the initial concentration is 500ppm, the 90% removal rate is ensured to be only 10min, and the desorption concentration at 180 ℃ can reach 800 ppm.
It should be noted that, in the case of the substrate being foam cement, the structure of the porous section containing nano-adsorbent for treating VOCs according to the present invention (for example, embodiment 4) is substantially similar to that of fig. 1, except that the secondary channels 102 are not provided, and thus no drawings are provided.
The utility model discloses use porous skeleton section bars such as melamine bubble cotton as the carrier, form high coverage adsorption coating with the nanometer adsorbent particle on porous skeleton surface through the self-assembly mode. A secondary pore channel structure is constructed on the base materials such as melamine foam and the like, and the secondary pore channel structure is used for reducing gas resistance generated when VOCs-containing waste gas passes through the material and increasing the flow of the waste gas, so that the material processing capacity is improved, and the secondary pore channel structure is suitable for working conditions with large air volume. The porous base material pore passage has rich structure and large specific surface area, so that the contact area of the nano adsorbent and VOCs molecules can be obviously increased by attaching zeolite and the like on the surface of the framework, and meanwhile, the porous base material pore passage is a non-straight-through pore passage, so that the zeolite collision probability can be increased when VOCs molecule-containing waste gas passes through the section, and the adsorption efficiency of VOCs can be obviously increased in the two aspects. Compared with the existing adsorbing material formed by direct extrusion, the corresponding nano adsorbent is efficiently utilized, so that the nano adsorbent which hardly participates in the interior can be reduced, the raw material consumption is reduced, and the cost is reduced. In the desorption process, hot air passes through the porous channel structure and rapidly reaches the nano adsorbent particles, heat exchange is carried out between the hot air and the nano adsorbent particles, and the nano adsorbent particles are rapidly heated to complete the desorption of VOCs. Such porous profiles have faster desorption efficiency. Therefore, the energy consumption of equipment during operation can be reduced. In the porous substrate skeleton self-assembly nanometer adsorbent coating, the high coverage rate and the addition of the adhesive can enhance the binding force between nanometer adsorbent particles and the skeleton surface, so that the nanometer adsorbent particles are not easy to fall off, and the secondary dust pollution is avoided.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A porous section bar that contains nanometer adsorbent for VOCs administers, its characterized in that: comprises a substrate framework layer (1) and a nano adsorbent adsorption layer (2); the substrate framework layer (1) is a porous framework section, and the pores of the porous framework section are primary open pore channels (101); at least one layer of nano adsorbent adsorption layer (2) is arranged on the surface of the substrate framework layer (1).
2. The porous shapes containing nano-adsorbent for VOCs remediation of claim 1, wherein: a plurality of secondary pore channels (102) are formed in the base framework layer (1), and the secondary pore channels (102) are all through holes.
3. The porous shapes containing nano-adsorbent for VOCs remediation of claim 2, wherein: the base framework layer (1) is made of melamine foam, foamed nickel, foamed iron and foamed aluminum; the secondary ducts (102) are evenly distributed.
4. The porous shapes containing nano-adsorbent for VOCs remediation of claim 2, wherein: the base framework layer (1) is made of melamine foam.
5. The porous shapes containing nano-adsorbent for VOCs treatment according to claim 1 or 2, characterized in that: the adsorbent in the nano adsorbent adsorption layer (2) is one of molecular sieve, metal organic framework material, modified activated carbon, diatomite, sepiolite, silica aerogel and zeolite.
6. The porous shapes containing nano-adsorbent for VOCs remediation of claim 2, wherein: the aperture size of the first-stage pore opening channel (101) is 0.05-1 mm; the diameter of the secondary pore canal (102) is 2-10 mm; the skeleton diameter of the substrate skeleton layer (1) is 0.005-0.1 mm.
7. The porous shapes containing nano-adsorbent for VOCs remediation of claim 1, wherein: the particle size of the adsorbent in the nano adsorbent adsorption layer (2) is 0.5-20 μm.
8. The porous shapes containing nano-adsorbent for VOCs remediation of claim 1, wherein: the aperture size of the first-stage pore opening channel (101) is 0.05-1 mm; the skeleton diameter of the substrate skeleton layer (1) is 0.005-0.1 mm; the base framework layer (1) is made of open-cell foam cement.
9. The porous shapes containing nano-adsorbent for VOCs treatment according to claim 1 or 2, characterized in that: the surface of the substrate framework layer (1) is bonded with the nano adsorbent adsorption layer (2) through a binder; the binder is one of organic silica sol, polytetrafluoroethylene dispersion, attapulgite, kaolin and sepiolite.
10. An apparatus for testing the performance of the porous section containing nano-adsorbent for VOCs remediation according to any one of claims 1 to 9 in adsorbing VOCs, comprising: comprises a first fan (3), an air channel heater (4), a sample bin (5) and a gas generator (6);
the first fan (3) is communicated with an inlet of the air channel heater (4) through a first pipeline (7), and an outlet of the air channel heater (4) is communicated with an inlet of the sample bin (5) through a second pipeline; a second concentration test port (8) is arranged on a connecting pipeline at the outlet of the sample bin (5); a first flow valve (9) and a first concentration test port (10) are arranged on the first pipeline (7), and the first concentration test port (10) is close to the air channel heater (4); a flowmeter (12) is mounted on the second pipeline (11);
the air inlet end of the gas generator (6) is communicated with a second fan (13), and a second flow valve (14) is mounted on the communicating pipeline; the outlet of the gas generator (6) is communicated with the first pipeline (7), and the communication position is positioned between the first flow valve (9) and the first concentration test port (10).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110102271A (en) * | 2019-05-15 | 2019-08-09 | 天津清科环保科技有限公司 | The Multi-hole section and its method, equipment containing nano adsorber administered for VOCs |
| CN114279889A (en) * | 2020-09-28 | 2022-04-05 | 必照岩土科技(南京)有限公司 | Soil body VOC gas adsorption test device and test method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110102271A (en) * | 2019-05-15 | 2019-08-09 | 天津清科环保科技有限公司 | The Multi-hole section and its method, equipment containing nano adsorber administered for VOCs |
| CN110102271B (en) * | 2019-05-15 | 2024-02-13 | 天津清科环保科技有限公司 | Porous section bar containing nano adsorbent for VOCs treatment and method and equipment thereof |
| CN114279889A (en) * | 2020-09-28 | 2022-04-05 | 必照岩土科技(南京)有限公司 | Soil body VOC gas adsorption test device and test method |
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