CN114181429A - Modified polyurethane sponge filler, preparation method and application thereof - Google Patents
Modified polyurethane sponge filler, preparation method and application thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/36—After-treatment
- C08J9/40—Impregnation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/84—Biological processes
- B01D53/85—Biological processes with gas-solid contact
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/36—After-treatment
- C08J9/365—Coating
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/36—After-treatment
- C08J9/40—Impregnation
- C08J9/42—Impregnation with macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention belongs to the technical field of biological treatment of waste gas, and particularly discloses a modified polyurethane sponge filler, and a preparation method and application thereof. The invention adopts polyurethane sponge with larger porosity and specific surface area as a main body, and firstly, the polyurethane sponge is soaked in potassium permanganate sulfuric acid solution for corrosion so as to obviously improve the surface roughness of the filler; then loading powdered activated carbon on the surface of the filler, increasing the specific surface area and having certain adsorption capacity on pollutants; then soaking in a ferric trichloride chitosan solution to enable the surface of the filler to have positive charges, and attracting the modified polyurethane sponge and bacteria with opposite charges due to electrostatic interaction to promote the attachment and biofilm formation of microorganisms; and washing and drying to obtain the modified polyurethane sponge filler. The modified polyurethane sponge filler prepared by the invention has strong adsorbability on waste gas and bacteria, ensures the treatment efficiency, solves the problems of low mass transfer rate, long film formation time and the like in the existing waste gas biological treatment, and improves the waste gas treatment effect.
Description
Technical Field
The invention relates to the technical field of biological treatment of waste gas, in particular to a modified polyurethane sponge filler, a preparation method and application thereof.
Technical Field
The purification treatment of organic waste gas is an important aspect of air pollution control, and in recent 30 years, with the rapid development of economy in China, the quantity and the types of Volatile Organic Compounds (VOCs) discharged into the atmosphere from industrial processes such as organic chemical industry, petrochemical industry, metallurgical chemicals, coal chemical industry, rubber regeneration, paint coating and the like are increasing day by day, and industrial VOCs become an important reason for the formation of dust-haze weather.
Among various treatment modes of VOCs, the biological method for treating organic waste gas is a pollution control technology which is gradually developed in recent years and becomes one of mainstream technologies for treating medium-low concentration waste gas, the biological method for purifying waste gas by using a biological trickling filter is a research hotspot in the field of atmospheric pollution control at present, and pollutants are degraded into CO mainly through the metabolic process of microorganisms attached and grown on fillers2Water and inorganic salt, and the waste gas is used as nutrition or energy to generate new microbial cytoplasm to form stable and balanced micro-ecological environment. Compared with traditional physical and chemical methods such as an absorption method, an adsorption method, a catalytic combustion method, a neutralization method and an oxidation method, the biological method has the advantages of good effect, stable operation, low operation cost, no secondary pollution and the like, is particularly suitable for treating large-flow and low-concentration waste gas, and has attracted more and more attention by people.
In a biotrickling exhaust gas treatment system, the packing is very important for biofilm formation in the biotrickling filter, as it provides a place on which microorganisms can inhabit, grow, and multiply, and its adsorption also ensures contact between gaseous pollutants and microorganisms. Compared with other similar materials, the polyurethane sponge filler can be well separated from water while keeping enough thallus quantity, has a high specific surface area, has a good space for the attachment and growth of active bacteria inside, has a porosity of more than 97 percent, and is widely used due to the advantages of easiness in obtaining, low cost, strong resilience force and the like. However, the surface of the polyurethane sponge has weak adsorption force between microorganisms and the polyurethane sponge due to the oxidation film and the smoothness of the polyurethane sponge, the microorganisms are easy to lose under the scouring action of the spray liquid, the biomass accumulation rate is slow, the formation of a biological film is not facilitated, and the application and the performance of the biological trickling filter are limited. The invention aims to provide a modified polyurethane sponge filler to enhance the waste gas treatment performance of a biotrickling filter.
Chinese patent document CN202010353688.7 discloses a foamed sponge filler and a preparation method thereof, wherein a vegetable fiber dispersion phase is added into a polyurethane prepolymer reaction liquid, and then the mixture is added into an internal mixer for internal mixing, and then the mixture is milled, granulated, and foamed and shaped after granulation, the invention realizes the control of the density and the surface roughness of the polyurethane sponge filler, although the polyurethane sponge filler is easy to be attached and grown by microorganisms to a certain extent, the scheme has the following defects: the polyurethane sponge filler is still in direct contact with microorganisms, the adsorption force is weak, cells of immobilized microorganisms of the polyurethane sponge filler easily fall off, the biomass accumulation rate on the polyurethane sponge filler is low, the film hanging time is long, the mass transfer rate for treating waste gas is low, and the waste gas treatment effect is poor.
Disclosure of Invention
In order to solve the problems, the invention provides the modified polyurethane sponge filler, the preparation method and the application thereof, the modified polyurethane sponge filler has good adsorption effect on microorganisms, is beneficial to the attachment and the film formation of the microorganisms, and can improve the waste gas treatment effect.
The inventor finds that the activated carbon has loose and porous internal structure, large specific surface area and electrostatic attraction, the adsorption capacity and adsorption force on microorganisms can be increased by coating the activated carbon on the surface of polyurethane sponge filler, and the polyurethane sponge can generate strong electrostatic interaction with related groups with negative electricity on the surface of bacteria by modifying the metal cation charges of the polyurethane sponge so as to promote the attachment and hanging of the microorganismsA film; the polyurethane sponge has a foam density of less than 18 kg/m3The porosity of the low-density PU is more than 97%, the activated carbon powder is not easy to go deep into the pores in the polyurethane sponge due to many and deep pores, the activated carbon can possibly not completely coat the outer surface of the polyurethane sponge due to the process and other reasons, the limitation of the pore size and the depth of the metal cations is small, the adsorption sites of the polyurethane sponge and microorganisms which are not covered by the activated carbon can be compensated, and the adsorption capacity and the adsorption force of the filler on the microorganisms are effectively enhanced by combining the activated carbon powder and the polyurethane sponge, so that the colonization film-forming time of the microorganisms to the surface of the filler is shortened, and the waste gas treatment efficiency is improved.
According to a first aspect of the present invention, there is provided a modified polyurethane sponge filler comprising: the polyurethane sponge matrix, activated carbon powder adhered to the surface of the polyurethane sponge matrix, and positive charges loaded on the surface and/or inside of the polyurethane sponge matrix; the polyurethane sponge matrix is polyurethane sponge after oxidation corrosion.
In the meaning of the present invention, the term "surface" refers to the outer surface of the polyurethane sponge matrix, the term "interior" refers to the internal pores of the polyurethane sponge matrix, and more specifically, to the inner walls of the internal pores of the polyurethane sponge matrix, and the term "oxidative corrosion" refers to the process of corrosive destruction of the surface structure of the polyurethane sponge by oxidation.
It is easy to think that the modified polyurethane sponge filler in the invention is a polyurethane sponge which is oxidized and corroded to form a hollow structure and is used as a matrix, activated carbon powder is adhered to the outer surface of the modified polyurethane sponge filler, and positive charges are loaded on the outer surface and/or the inner part of the modified polyurethane sponge filler, wherein the inner part specifically refers to the inner wall of the inner pores of the polyurethane sponge filler.
According to a second aspect of the present invention, there is provided a method for preparing a modified polyurethane sponge filler, comprising the steps of:
s1, under an ultrasonic condition, immersing polyurethane sponge in a strong oxidant solution for oxidation corrosion to obtain a polyurethane sponge matrix;
s2, spraying activated carbon powder on the surface of the polyurethane sponge matrix;
and S3, immersing the polyurethane sponge matrix loaded with the activated carbon powder into an iron salt solution for cationic charge modification to obtain the modified polyurethane sponge filler.
The process and mechanism of the modified polyurethane sponge filler formed according to the steps are as follows: the polyurethane sponge is oxidized and corroded by a strong oxidant, the roughness of the outer surface and the inner wall of a pore of the polyurethane sponge is improved, the specific surface area of the polyurethane sponge is increased, then the activated carbon powder is loaded on the outer surface of the filler, the roughness of the polyurethane sponge is improved, and the porous property and the electrostatic attraction of the activated carbon powder are added, so that the adsorption capacity and the adsorption force of the activated carbon-loaded polyurethane sponge on microorganisms and waste gas are obviously improved, the contact sites of the polyurethane sponge and the microorganisms, which cannot be touched or not covered by the activated carbon powder, are compensated by ferric salt cation modification because the activated carbon powder is not easy to adhere to the inner wall of the pore of the polyurethane sponge, the cation-modified polyurethane sponge has stable positive charges and can generate strong electrostatic interaction with the related groups on the negatively charged bacteria surface, and the adsorption capacity and the adsorption force of the surface of the filler on the microorganisms are effectively enhanced, shortens the time of microbe colonization and film formation and improves the treatment efficiency of waste gas.
Preferably, the strong oxidant solution is a potassium permanganate-concentrated sulfuric acid solution, wherein the molar ratio of potassium permanganate to concentrated sulfuric acid is 1: 3-3.2, the time of the oxidative corrosion is 10-15min, such as 10min, 11min, 12min, 13min, 14min and 15min, the ultrasonic power is 100-150W, such as 100W, 110W, 120W, 130W, 140W and 150W, and the temperature of the oxidative corrosion is room temperature, so that the roughness can be remarkably improved and the through between the pores in the polyurethane sponge can not be caused based on the reaction condition.
Preferably, the particle size of the activated carbon powder is 500-800 meshes, more preferably 600-700 meshes, when the particle size is too large, the pores of the polyurethane sponge are blocked, and when the particle size is too small, the specific surface area increasing effect is not good;
preferably, as a cationic charge modification modifier, the ferric salt solution is a chitosan solution of ferric trichloride, and the mass ratio of the ferric trichloride to the chitosan is 2.7-3: 1, the cationic charge modification time is 30-45min, the modification temperature is room temperature, chitosan is used as a dispersing agent of ferric chloride on one hand, and on the other hand, the chitosan belongs to a weak cationic organic polymer and is matched with ferric chloride, positive charges on a molecular chain of the chitosan are superposed with positive charges of the ferric chloride, the adsorption force on negatively charged microorganisms is further enhanced, and acetic acid can be added for improving the solubility and stability of the chitosan, wherein the mass concentration of the acetic acid is 2-2.5%.
It is known that the adhesion of activated carbon powder to the surface of polyurethane sponge matrix by spraying has the advantages of uniformity and high efficiency, but the adhesion is not enough, and the activated carbon powder is at risk of falling off after being washed by spraying liquid, therefore, in a typical technical scheme, the steps S1 and S2 further include: and S1.2, coating a water-based paint on the surface of the polyurethane sponge matrix, wherein the water-based paint is a water solution of water-based polyurethane, the mass of the water-based polyurethane and deionized water is 4-6: 1, and more preferably 5: 1, and the water-based paint is used as a binder to bond the activated carbon powder on the polyurethane sponge matrix so as to reduce the falling probability of the activated carbon powder.
In order not to affect the subsequent loading of activated carbon powder and cationic charge, after step S1, the obtained polyurethane sponge matrix is washed with hydrochloric acid and then with phosphate buffer solution to overcome the interference of impurities, and the specific steps are as follows: washing off a brown layer on the surface of the polyurethane sponge matrix by using a hydrochloric acid solution, fully washing by using a phosphate buffer solution until the pH value of a washing solution is 7.0, and then drying by blowing air in an oven at the temperature of 60-80 ℃, repeating the steps for 2-3 times to obtain the polyurethane sponge matrix.
According to the third aspect of the invention, the prepared modified polyurethane sponge filler is used for removing waste gas and/or bacteria in a biological trickling filter.
The invention has the beneficial effects that:
1. the polyurethane sponge filler prepared by oxidative corrosion modification, activated carbon adhesion modification and cationic charge modification has large capacity and strong adsorption force on microorganisms, is beneficial to film formation, shortens the colonization and film formation time of the microorganisms, has high mass transfer rate on waste gas, and improves the treatment efficiency of the waste gas;
2. microorganisms adsorbed on the polyurethane sponge filler are not easy to lose under the scouring action of the spray liquid, the biomass accumulation speed is high, no secondary pollution is caused, and the manufacturing process is simple;
3. the polyurethane sponge filler has the advantages of adsorption effect on microorganisms and waste gas, good waste gas purification effect and wide application.
Drawings
Fig. 1 is a schematic diagram showing the change of biomass after the polyurethane sponge filler prepared by the scheme and the comparative example is applied to a biological trickling filter for waste gas purification treatment.
Detailed Description
The present invention will be described in further detail with reference to examples.
It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available by purchase.
Example 1
A modified polyurethane sponge filler comprising:
a polyurethane sponge matrix, and
activated carbon powder adhered to the surface thereof, positive charges carried on the surface and/or inside thereof;
the polyurethane sponge matrix is polyurethane sponge after oxidation corrosion.
The polyurethane sponge which is oxidized and corroded to form a hollow structure is used as a matrix, activated carbon powder is adhered to the outer surface of the polyurethane sponge, positive charges are loaded on the outer surface and/or the inner part of the polyurethane sponge, and the inner part is specifically the inner wall of the inner hole of the polyurethane sponge.
Example 2
A preparation method of a modified polyurethane sponge filler comprises the following steps:
s1, oxidation corrosion modification: placing polyurethane sponge in a potassium permanganate concentrated sulfuric acid solution with a molar ratio of 1: 3, sealing with a sealing film, placing in an ultrasonic cleaning machine with power of 120W, ultrasonically soaking for 10min at room temperature, taking out the filler, washing off a brown layer on the surface of the filler with a hydrochloric acid solution, sufficiently cleaning with a phosphate buffer solution until the pH of a cleaning solution is 7.0, placing in a forced air oven for drying at 60 ℃, and repeatedly cleaning and drying for 2 times to obtain a polyurethane sponge matrix;
s2, loading active carbon: brushing a waterborne polyurethane deionized water coating with the mass ratio of 5: 1 to the polyurethane sponge matrix by using a brush, spraying 500-mesh activated carbon powder on the surface of the polyurethane sponge matrix by using an electric spraying pot, drying in a blast oven at 60 ℃, washing with deionized water until the washing liquid does not suspend the activated carbon powder, and repeatedly washing and drying for 2 times to obtain the activated carbon-loaded polyurethane sponge matrix;
s3, cationic charge modification: dissolving the required chitosan by using acetic acid with the mass concentration of 2%, placing the polyurethane sponge matrix loaded with the activated carbon into a ferric trichloride chitosan solution with the mass ratio of 2.7: 1, soaking at room temperature for 30 min, taking out, cleaning by using absolute ethyl alcohol and deionized water, then placing into a blast oven to dry at 60 ℃, repeatedly cleaning and drying for 2 times to obtain the modified polyurethane sponge filler;
s4, maintenance and storage: the modified polyurethane sponge filler can be maintained and stored under the conditions of room temperature, light shielding and 30 percent of humidity to obtain the modified polyurethane sponge filler which can be applied to the biological purification treatment of waste gas.
Example 3
A preparation method of a modified polyurethane sponge filler comprises the following steps:
s1, oxidation corrosion modification: placing polyurethane sponge in a potassium permanganate concentrated sulfuric acid solution with a molar ratio of 1: 3.1, sealing with a sealing film, placing in an ultrasonic cleaning machine with the power of 100W, ultrasonically soaking for 12min at room temperature, taking out the filler, washing off a brown layer on the surface of the filler with a hydrochloric acid solution, fully cleaning with a phosphate buffer solution until the pH of a cleaning solution is 7.0, placing in a blast oven for drying at 70 ℃, and repeatedly cleaning and drying for 3 times to obtain a polyurethane sponge matrix;
s2, loading active carbon: brushing a water-based polyurethane deionized water coating with the mass ratio of 5: 1 to the polyurethane sponge matrix by using a brush, spraying 800-mesh activated carbon powder on the surface of the polyurethane sponge matrix by using an electric spraying pot, drying in a blast oven at 70 ℃, washing with deionized water until the washing solution does not suspend the activated carbon powder, and repeatedly washing and drying for 2 times to obtain the activated carbon-loaded polyurethane sponge matrix;
s3, cationic charge modification: dissolving the required chitosan by using acetic acid with the mass concentration of 2.3%, placing the polyurethane sponge matrix loaded with the activated carbon into a ferric trichloride chitosan solution with the mass ratio of 2.8: 1, soaking at room temperature for 35 min, taking out, cleaning by using absolute ethyl alcohol and deionized water, then placing into a blast oven to dry at 70 ℃, repeatedly cleaning and drying for 2 times to obtain the modified polyurethane sponge filler;
s4, maintenance and storage: the modified polyurethane sponge filler can be maintained and stored under the conditions of room temperature, light shielding and 20 percent of humidity to obtain the modified polyurethane sponge filler which can be applied to the biological purification treatment of waste gas.
Example 4
A preparation method of a modified polyurethane sponge filler comprises the following steps:
s1, oxidation corrosion modification: placing polyurethane sponge in a potassium permanganate concentrated sulfuric acid solution with a molar ratio of 1: 3.2, sealing by using a sealing film, placing in an ultrasonic cleaning machine with the power of 150W for ultrasonic soaking for 12min at room temperature, taking out the filler, washing off a brown layer on the surface of the filler by using a hydrochloric acid solution, fully cleaning by using a phosphate buffer solution until the pH of a cleaning solution is 7.0, placing in a blast oven for drying at 80 ℃, and repeatedly cleaning and drying for 3 times to obtain a polyurethane sponge matrix;
s2, loading active carbon: brushing a water-based polyurethane deionized water coating with the mass ratio of 4: 1 to the polyurethane sponge matrix by using a brush, spraying 600-mesh activated carbon powder on the surface of the polyurethane sponge matrix by using an electric spraying pot, drying in a blast oven at 70 ℃, washing with deionized water until the washing solution does not suspend the activated carbon powder, and repeatedly washing and drying for 2 times to obtain the activated carbon-loaded polyurethane sponge matrix;
s3, cationic charge modification: dissolving the required chitosan by using acetic acid with the mass concentration of 2.5%, placing the polyurethane sponge matrix loaded with the activated carbon into a ferric trichloride chitosan solution with the mass ratio of 3: 1, soaking for 45min at room temperature, taking out, cleaning by using absolute ethyl alcohol and deionized water, then placing into a blast oven to dry at 70 ℃, repeatedly cleaning and drying for 2 times to obtain the modified polyurethane sponge filler;
s4, maintenance and storage: the modified polyurethane sponge filler can be maintained and stored under the conditions of room temperature, light shielding and 15 percent of humidity to obtain the modified polyurethane sponge filler which can be applied to the biological purification treatment of waste gas.
Comparative example 1
A preparation method of polyurethane sponge filler comprises the following steps:
s1, oxidation corrosion modification: placing polyurethane sponge in a potassium permanganate concentrated sulfuric acid solution with a molar ratio of 1: 3.1, sealing with a sealing film, placing in an ultrasonic cleaning machine with the power of 100W, ultrasonically soaking for 12min at room temperature, taking out the filler, washing off a brown layer on the surface of the filler with a hydrochloric acid solution, fully cleaning with a phosphate buffer solution until the pH of a cleaning solution is 7.0, placing in a blast oven for drying at 70 ℃, and repeatedly cleaning and drying for 3 times to obtain a polyurethane sponge matrix;
s2, cationic charge modification: dissolving the required chitosan by using acetic acid with the mass concentration of 2.3%, placing the polyurethane sponge matrix into a ferric trichloride chitosan solution with the mass ratio of 2.8: 1, soaking at room temperature for 35 min, taking out, cleaning by using absolute ethyl alcohol and deionized water, then placing into a blast oven to dry at 70 ℃, repeatedly cleaning and drying for 2 times;
s3, maintenance and storage: the polyurethane sponge filler can be maintained and stored under the conditions of room temperature, light protection and 20 percent of humidity to obtain the polyurethane sponge filler which can be applied to the biological purification treatment of waste gas.
Comparative example 2
A preparation method of polyurethane sponge filler comprises the following steps:
s1, oxidation corrosion modification: placing polyurethane sponge in a potassium permanganate concentrated sulfuric acid solution with a molar ratio of 1: 3.1, sealing with a sealing film, placing in an ultrasonic cleaning machine with the power of 100W, ultrasonically soaking for 12min at room temperature, taking out the filler, washing off a brown layer on the surface of the filler with a hydrochloric acid solution, fully cleaning with a phosphate buffer solution until the pH of a cleaning solution is 7.0, placing in a blast oven for drying at 70 ℃, and repeatedly cleaning and drying for 3 times to obtain a polyurethane sponge matrix;
s2, loading active carbon: brushing a water-based polyurethane deionized water coating with the mass ratio of 5: 1 to the polyurethane sponge matrix by using a brush, spraying 800-mesh activated carbon powder on the surface of the polyurethane sponge matrix by using an electric spraying pot, drying in a blast oven at 70 ℃, washing with deionized water until the washing solution does not contain suspended activated carbon powder, and repeatedly washing and drying for 2 times;
s3, maintenance and storage: the modified polyurethane sponge filler can be maintained and stored under the conditions of room temperature, light shielding and 20 percent of humidity to obtain the modified polyurethane sponge filler which can be applied to the biological purification treatment of waste gas.
Evaluation of
The modified polyurethane sponge fillers of examples 2 to 4 and the modified polyurethane fillers of comparative examples 1 to 2 and unmodified control polyurethane fillers are respectively filled into a bio-trickling filter tower, chlorobenzene waste gas treatment is carried out by continuous operation, the removal rate of chlorobenzene in waste gas is tested by utilizing an industrial standard HJ621-2011 after different days of operation, wherein the effective filler volume of the bio-trickling filter tower is 5L, the empty bed retention time is 40 s, and the chlorobenzene inlet gas concentration is 100 mg/m3Specific chlorobenzene removal rates are shown in table 1, and specific biomass changes are shown in fig. 1.
TABLE 1 removal of Chlorobenzene for different polyurethane sponge fillers
As can be concluded from Table 1 and FIG. 1, the modified polyurethane sponge filler prepared by the invention is applied to a bio-trickling filter for waste gas purification treatment, and has an effective filler volume of 5L, an empty bed retention time of 40 s, and a chlorobenzene inlet gas concentration of100 mg/m3The modified polyurethane sponge filler prepared by the method has the advantages that the modified polyurethane sponge filler is operated for 30 days, the chlorobenzene waste gas removal rate can reach more than 85%, the most preferable filler prepared in the embodiment 3 can reach 93% of degradation rate, and the biomass on the surface of the filler is 1.25 mg/g compared with that of the comparative example, so that the modified polyurethane sponge filler prepared by the method improves the waste gas treatment efficiency.
Furthermore, those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
Those of ordinary skill in the art will understand that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same, although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it is possible to modify the solutions described in the previous embodiments or to substitute some or all of the technical features thereof without departing from the scope of the claims.
Claims (10)
1. A modified polyurethane sponge filler, characterized by comprising:
a polyurethane sponge matrix, and
activated carbon powder adhered to the surface thereof, positive charges carried on the surface and/or inside thereof;
the polyurethane sponge matrix is polyurethane sponge after oxidation corrosion.
2. A method for preparing the modified polyurethane sponge filler as claimed in claim 1, which comprises the following steps:
s1, under an ultrasonic condition, immersing polyurethane sponge in a strong oxidant solution for oxidation corrosion to obtain a polyurethane sponge matrix;
s2, spraying activated carbon powder on the surface of the polyurethane sponge matrix;
and S3, immersing the polyurethane sponge matrix loaded with the activated carbon powder into an iron salt solution for cationic charge modification to obtain the modified polyurethane sponge filler.
3. The method for preparing the modified polyurethane sponge filler as claimed in claim 2, wherein the strong oxidant solution is potassium permanganate-concentrated sulfuric acid solution.
4. The method for preparing the modified polyurethane sponge filler as claimed in claim 2, wherein step S1 further comprises washing the obtained polyurethane sponge matrix with hydrochloric acid and then with phosphate buffer solution.
5. The method for preparing the modified polyurethane sponge filler as claimed in claim 2, wherein the step between step S1 and step S2 further comprises: and S1.2, coating the water-based paint on the surface of the polyurethane sponge matrix.
6. The method for preparing the modified polyurethane sponge filler as claimed in claim 5, wherein the water-based paint is an aqueous solution of water-based polyurethane.
7. The method for preparing the modified polyurethane sponge filler as claimed in claim 2, wherein the particle size of the activated carbon powder is 500-800 mesh.
8. The method for preparing the modified polyurethane sponge filler as claimed in claim 2, wherein the ferric salt solution is a chitosan solution of ferric trichloride.
9. The method for preparing the modified polyurethane sponge filler as claimed in claim 8, wherein the solution of iron salt further comprises acetic acid.
10. Use of the modified polyurethane sponge filler prepared according to the preparation method of any one of claims 2 to 9 for removing exhaust gases and/or bacteria from a biotrickling filter.
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Cited By (2)
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| CN114735832A (en) * | 2022-06-15 | 2022-07-12 | 清研环境科技股份有限公司 | Modular sewage treatment system, treatment method and application thereof |
| CN115520957A (en) * | 2022-09-20 | 2022-12-27 | 同济大学 | Modified polyurethane sponge filler for strengthening low-temperature-resistant flora treatment of toilet excrement black water and preparation method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0747355A (en) * | 1993-08-04 | 1995-02-21 | Ebara Res Co Ltd | Process material for water-containing cod, production of processing material, and processing method of water-containing cod |
| CN108675438A (en) * | 2018-05-18 | 2018-10-19 | 河南海天水务工程有限公司 | A kind of MNBR nitrogen and phosphorus removal bios filler |
| CN110563127A (en) * | 2019-08-26 | 2019-12-13 | 天津市环境保护技术开发中心设计所 | preparation method of modified polyurethane sponge filler for MBBR (moving bed biofilm reactor) process emergency |
| CN110813079A (en) * | 2019-11-08 | 2020-02-21 | 清华大学 | Organic polymer filler surface modification method |
| CN111100321A (en) * | 2019-12-31 | 2020-05-05 | 西安建筑科技大学 | Method for modifying polyurethane surface to promote film forming effect |
| CN111530272A (en) * | 2020-05-19 | 2020-08-14 | 中建一局集团安装工程有限公司 | Biological deodorization filler and trickling filter tower for removing garbage leachate odor by using same |
-
2021
- 2021-12-16 CN CN202111536601.0A patent/CN114181429B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0747355A (en) * | 1993-08-04 | 1995-02-21 | Ebara Res Co Ltd | Process material for water-containing cod, production of processing material, and processing method of water-containing cod |
| CN108675438A (en) * | 2018-05-18 | 2018-10-19 | 河南海天水务工程有限公司 | A kind of MNBR nitrogen and phosphorus removal bios filler |
| CN110563127A (en) * | 2019-08-26 | 2019-12-13 | 天津市环境保护技术开发中心设计所 | preparation method of modified polyurethane sponge filler for MBBR (moving bed biofilm reactor) process emergency |
| CN110813079A (en) * | 2019-11-08 | 2020-02-21 | 清华大学 | Organic polymer filler surface modification method |
| CN111100321A (en) * | 2019-12-31 | 2020-05-05 | 西安建筑科技大学 | Method for modifying polyurethane surface to promote film forming effect |
| CN111530272A (en) * | 2020-05-19 | 2020-08-14 | 中建一局集团安装工程有限公司 | Biological deodorization filler and trickling filter tower for removing garbage leachate odor by using same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114735832A (en) * | 2022-06-15 | 2022-07-12 | 清研环境科技股份有限公司 | Modular sewage treatment system, treatment method and application thereof |
| CN115520957A (en) * | 2022-09-20 | 2022-12-27 | 同济大学 | Modified polyurethane sponge filler for strengthening low-temperature-resistant flora treatment of toilet excrement black water and preparation method thereof |
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| CN114181429B (en) | 2023-05-12 |
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