CN111841498B - Guanidine salt modified activated carbon for removing aldehyde, preparation method thereof, composite filter screen comprising guanidine salt modified activated carbon and air purification device - Google Patents

Guanidine salt modified activated carbon for removing aldehyde, preparation method thereof, composite filter screen comprising guanidine salt modified activated carbon and air purification device Download PDF

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CN111841498B
CN111841498B CN201910358600.8A CN201910358600A CN111841498B CN 111841498 B CN111841498 B CN 111841498B CN 201910358600 A CN201910358600 A CN 201910358600A CN 111841498 B CN111841498 B CN 111841498B
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activated carbon
guanidine salt
modified activated
guanidine
salt modified
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CN111841498A (en
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林炜罡
肖伽励
迈克尔·文德兰
程亮
迈克尔·科比
朱阳
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3M Innovative Properties Co
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
    • B01D46/0036—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions by adsorption or absorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
    • 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
    • B01D53/46—Removing components of defined structure
    • B01D53/72—Organic compounds not provided for in groups B01D53/48 - B01D53/70, e.g. hydrocarbons
    • 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
    • B01D53/81—Solid phase processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/708—Volatile organic compounds V.O.C.'s

Abstract

The invention provides guanidine salt modified activated carbon for removing aldehyde, which meets the following indexes: (1) Before guanidine salt modification, the initial CTC value of the activated carbon is more than 60; and (2) the pore volume retention of the activated carbon after guanidine salt modification is between 22% and 85%. The invention also provides a preparation method of the guanidine salt modified activated carbon, a composite filter screen comprising the guanidine salt modified activated carbon and an air purification device comprising the composite filter screen. By utilizing the guanidine salt modified activated carbon and the composite filter screen comprising the guanidine salt modified activated carbon, aldehyde substances, particularly formaldehyde in air can be efficiently removed (the F-CADR value of the composite filter screen per square meter is 200 m) 3 More than h).

Description

Guanidine salt modified activated carbon for removing aldehyde, preparation method thereof, composite filter screen comprising guanidine salt modified activated carbon and air purification device
Technical Field
The invention relates to the field of air purification, and more particularly relates to guanidine salt modified activated carbon for removing aldehyde, a preparation method thereof, a composite filter screen comprising the guanidine salt modified activated carbon and an air purification device.
Background
Air quality is a hot topic in countries around the world, especially in china. In recent years, more and more households, and better households with children, like to buy air purifiers. Their focus has been on the conversion of PM2.5 to formaldehyde, which is released from paints, floors and furniture. Formaldehyde is a highly toxic compound and is a known compound that is allergic to humans. In addition, formaldehyde has been classified as a class of carcinogens by the international agency for research on cancer. WHO directs a standard of 0.08ppm for 30 minutes of formaldehyde exposure. In recent years, the public in china has greatly increased awareness of the health-hazardous effects of continued exposure to formaldehyde. Therefore, there is an urgent need for solutions to human exposure to formaldehyde.
Currently, formaldehyde can be removed by various technologies such as adsorption filtration, ultraviolet light catalytic oxidation, catalytic decomposition, ozone oxidation, ionization/plasma and the like. However, adsorptive filtration is preferred because one potential problem with other air purification techniques is the potential for the production of hazardous intermediates and secondary products.
There are many documents in the prior art that mention the technology of removing formaldehyde by using activated carbon. For example, JP 2009247978 discloses an agent for adsorbing lower aldehydes such as formaldehyde used in the preparation of resins and building materials, obtained by impregnating urea, thiourea, guanidine and derivatives thereof on oxidized activated carbon and then heating; WO9417907 discloses a respirator carbon for protection against acid gases and formaldehyde; US 7737083 discloses a high performance adsorbent based on highly microporous activated carbon; US2012017221 discloses a high performance adsorbent based on activated carbon with high mesopores and macroporosity; and JPH03080934 discloses an adsorbent for the removal of lower aldehydes using guanidine carbonate. However, in these prior arts, a technique or a product using only the adsorption property of activated carbon (no modifier is used) or using the adsorption property of modified activated carbon (the modifier itself cannot react with formaldehyde) cannot satisfy the current requirement for removing formaldehyde; although the technology or the product of modifying the activated carbon by using the modifier capable of reacting with formaldehyde has improved formaldehyde removal capability, the literature technologies do not provide index parameters for ensuring that the obtained modified activated carbon product can sufficiently remove formaldehyde, and further do not provide product indexes capable of meeting industrial applications such as application of the modified activated carbon product to a composite filter screen of an air purification device.
Accordingly, there remains a need in the art to provide modified activated carbon technologies and products that can ensure repeated removal of aldehydes (particularly formaldehyde).
Disclosure of Invention
In view of the state of the art, it is an object of the present invention to provide a filter mesh which not only can remove aldehydes (particularly formaldehyde) by chemical reaction, but also can ensure that a composite filter mesh obtained by compositing with a filter medium is obtained per square meterThe F-CADR value of the area is 200m 3 More than h guanidine salt modified activated carbon for removing aldehyde, a preparation method thereof, a composite filter screen comprising the guanidine salt modified activated carbon and an air purification device.
To this end, in one aspect, the present invention provides a guanidine salt modified activated carbon for removing aldehydes, characterized in that the guanidine salt modified activated carbon satisfies the following criteria: (1) The initial CTC value of the activated carbon prior to guanidine salt modification is 60 or greater; and (2) the pore volume retention of the activated carbon after guanidine salt modification is between 22% and 85%.
In a preferred embodiment, the pore volume retention of the activated carbon after modification with a guanidinium salt is between 45% and 67%.
In another aspect, the present invention provides a method for preparing a guanidinium-modified activated carbon for aldehyde removal, comprising:
mixing activated carbon and a guanidine salt aqueous solution and uniformly stirring to load guanidine salt on the surface of the activated carbon by an impregnation method;
drying the obtained mixture at the temperature of 80-100 ℃ under stirring to obtain the guanidine salt modified activated carbon,
wherein the guanidine salt modified activated carbon meets the following indexes: (1) Before guanidine salt modification, the initial CTC value of the activated carbon is more than 60; and (2) the pore volume retention of the activated carbon after guanidine salt modification is between 22% and 85%.
In a preferred embodiment, the guanidine salt is guanidine carbonate.
In a preferred embodiment, the activated carbon has a pore volume retention between 45% and 67%.
In a preferred embodiment, the loading amount of guanidine salt is 7.0 to 23.0 mass% with respect to the mass of the activated carbon.
In another aspect, the present invention provides a composite filter screen for removing aldehydes, the composite filter screen comprising a filter material and the above guanidine salt-modified activated carbon compounded on the filter material, wherein the composite filter screen has an F-CADR value of 200m per square meter 3 More than h.
In a preferred embodiment, the guanidine salt modified activated carbon is composited on the filter material by coating or adsorption.
In a preferred embodiment, the loading capacity of the guanidine salt modified activated carbon on the filter material is 200-400 g/m 2 。
In another aspect, the present invention provides an air cleaning device comprising the composite filter screen described above.
In a preferred embodiment, the air purifying device has an air volume of 350-450m 3 An air purifier of/h.
The invention provides a method for removing aldehyde substances (particularly formaldehyde) in a chemical reaction mode and ensuring that the F-CADR value of each square meter of filter screen area of a composite filter screen obtained by compounding the activated carbon with a filter material is 200m by performing guanidine salt modification on the activated carbon with a specific CTC value and ensuring that the activated carbon has a specific pore volume retention rate after being subjected to guanidine salt modification 3 A guanidine salt-modified activated carbon for aldehyde removal of more than/h, and thereby a composite filter screen and an air cleaning device excellent in aldehyde removal performance are provided. In addition, the air cleaning device provided by using the guanidine salt modified activated carbon of the present invention does not generate an odor during long-term use.
Drawings
Fig. 1 shows a flow diagram for preparing a guanidinium-modified activated carbon for aldehyde removal according to one embodiment of the present invention.
Fig. 2 shows a schematic representation of a composite screen made according to one embodiment of the present invention.
Detailed Description
As a result of intensive and extensive studies by the inventors of the present invention, it was unexpectedly found that, in the process of modifying activated carbon with a guanidine salt, by ensuring that the CTC value of activated carbon before guanidine salt modification is 60 or more and the pore volume retention of activated carbon after guanidine salt modification is between 22% and 85%, the guanidine salt-modified activated carbon product thus obtained is capable of not only completely removing aldehyde substances (particularly formaldehyde) in a chemical reaction manner, but also ensuring the F-CADR value per square meter of the screen area of a composite screen obtained by compounding with a filter materialIs 200m 3 More than h.
More specifically, the guanidine salt modified activated carbon for removing aldehyde provided by the invention meets the following indexes: (1) The initial CTC value of the activated carbon prior to guanidine salt modification is 60 or greater; and (2) the pore volume retention of the activated carbon after guanidine salt modification is between 22% and 85% (more preferably between 45% and 67%).
As used herein, the term "removing aldehydes" means removing aldehydes, particularly removing aldehydes in indoor air, more particularly formaldehyde in air, for the purpose of purifying air.
As used herein, the term "activated carbon" means activated carbon known in the art having adsorption properties.
As used herein, the term "guanidine salt" means a salt of the compound guanidine, including but not limited to carbonates, chloride salts, nitrates, and the like, with guanidine carbonate being a particularly preferred guanidine salt.
As used herein, the term "CTC value" means a carbon tetrachloride (carbon tetrachloride) value, which can be determined according to JIS 1474 standard methods.
As used herein, the term "loading" means the mass ratio of the supported guanidinium salt to the activated carbon in the guanidinium salt-modified activated carbon. In the present invention, it is preferable that the loading amount of guanidine salt is 7 to 23%, more preferably about 15.0%, based on the mass of activated carbon.
As used herein, the term "pore volume" means the total volume of pores present in a porous or perforated material, where pores include macropores, mesopores, and micropores.
As used herein, the term "pore volume retention" means the percentage of the pore volume of the activated carbon after modification relative to the pore volume of the activated carbon before modification.
Without being bound by any particular theory, the inventors believe that, on the one hand, it is not only necessary to modify the activated carbon with a guanidinium salt to ensure that the modified activated carbon product is able to remove formaldehyde not only by adsorption but also more by chemical reaction; on the other hand, toIn the guanidine salt modified activated carbon, the effective pore volume and the adsorption capacity of the activated carbon for removing aldehyde can be ensured by the index of the specific CTC value (more than 60) of the activated carbon before modification, and the effective pore volume and the adsorption capacity of the modified activated carbon for removing aldehyde can be ensured by the retention rate (between 22 and 85 percent) of the specific pore volume of the modified activated carbon after modification, so that the aldehyde can be removed in a true sense only by the guanidine salt modified activated carbon which simultaneously meets the two index parameters, and only the guanidine salt modified activated carbon can obtain the activated carbon which meets the specific index (the F-CADR value of the filter screen area per square meter is 200 m) 3 Over/h) and thereby obtaining an air cleaning device that meets the requirement for removing aldehydes in a true sense.
The guanidine salt modified activated carbon for removing aldehyde of the invention can be simply prepared by the following method: mixing activated carbon and a guanidine salt aqueous solution and uniformly stirring to load guanidine salt on the surface of the activated carbon by an impregnation method; and drying the obtained mixture at the temperature of 80-100 ℃ under stirring to obtain the guanidine salt modified activated carbon, wherein the guanidine salt modified activated carbon meets the following indexes: (1) Before guanidine salt modification, the initial CTC value of the activated carbon is more than 60; and (2) the pore volume retention of the activated carbon after guanidine salt modification is between 22% and 85% (more preferably between 45% and 67%).
In a particular embodiment, the guanidine salt modified activated carbon for aldehyde removal of the present invention can be prepared by the procedure shown in fig. 1: firstly, preparing a required amount of guanidine salt such as guanidine carbonate into a modified solution such as guanidine salt water solution; the Activated Carbon (AC) with the desired CTC value is then placed in the solution (i.e. impregnation) or preferably the modified solution is uniformly sprayed onto the activated carbon in a controlled manner (spraying) and finally dried at a temperature of 80 to 100 ℃ to obtain a guanidinium salt modified activated carbon with the desired pore volume retention. Oven drying the samples the pore volume was measured by a Micromeritic ASAP2020 nitrogen adsorber to obtain modified pore volume retention:
pore volume retention (%) = pore volume after modification/pore volume of base carbon before modification x 100%
The invention also providesProvides a composite filter screen for removing aldehyde, the composite filter screen comprises a filter material and the guanidine salt modified activated carbon compounded on the filter material, wherein the F-CADR value of the composite filter screen per square meter is 200m 3 More than h, or the F-CADR value of the composite filter screen is 200m 3 /m 2 H or more.
As used herein, the term "CADR value" means a clean air output ratio, and correspondingly "F-CADR value" means a CADR value after formaldehyde removal, which can be measured in accordance with GB/T-18801.
In the present invention, preferably, the guanidine salt-modified activated carbon may be bonded to a filter such as a nonwoven fabric filter by a hot melt adhesive. The filter medium used in the present invention is not particularly limited, and may be any technique conventionally used in the art for producing a filter by compounding with activated carbon, such as a porous cardboard filter, a nonwoven fabric filter, and the like.
In the present invention, the amount of guanidine salt modified activated carbon supported on the filter is not particularly limited. Preferably, the loading capacity of the guanidine salt modified activated carbon on the filter material can be 200-400 g/m 2 。
FIG. 2 shows a schematic representation of a composite filter screen prepared according to one embodiment of the present invention, wherein the filter is a non-woven fabric secured to a support and the guanidine salt modified activated carbon has a loading on the filter of about 300g/m 2 。
The invention also provides an air purification device, preferably an air purifier, comprising the composite filter screen.
Examples
The invention will be illustrated below by means of specific examples, but it is understood by those skilled in the art that these examples are not intended to limit the scope of protection of the invention.
In the following examples, unless otherwise specified, the methods used are conventional in the art, and the materials, reagents, detection devices, and the like used are commercially available.
Activated carbon: available from companies such as Coly, black Cabo or Atobi.
Guanidine salt: available from national medicine or from the reagent of JINGYUN, shanghai.
Filtering material: a nonwoven fabric filter M18 or VLL100 manufactured by 3M company was used.
Preparation of guanidine salt modified activated carbon (impregnation method):
in a plastic barrel, modifying agent guanidine carbonate is dissolved in water to obtain guanidine carbonate water solution with certain concentration. Then, the guanidine carbonate aqueous solution is evenly mixed with a proper amount of active carbon, and a barrel cover is covered to mechanically roll for half an hour. And finally, pouring the obtained mixture into a tray, heating the mixture in an oven to 90 ℃ and drying the mixture to obtain the guanidine salt modified activated carbon with guanidine salt loaded on the activated carbon by an impregnation method. The initial CTC value and pore volume before modification of the activated carbon used in examples 1-4 and comparative examples 1-6, and the amount of guanidine salt supported (based on the mass of the activated carbon), pore volume after modification, and pore volume retention in the activated carbon after guanidine salt modification are shown in table 1 below.
Evaluation of formaldehyde removal from guanidine salt-modified activated carbon:
bonding the guanidine salt modified activated carbon on a non-woven fabric filter material through hot melt adhesive (thereby obtaining a composite filter screen, wherein the loading capacity of the guanidine salt modified activated carbon on the filter material is 300g/m 2 And the area of the obtained composite filter screen is 1.1m 2 . The composite filter screen was placed in a 3M KJ455 air cleaner and evaluated for formaldehyde removal performance according to GB/T-18801. F-CADR values obtained in examples 1 to 4 and comparative examples 1 to 6 are shown in Table 1 below.
Figure GDA0002933674540000071
As can be seen from the results in Table 1, the guanidine salt modified activated carbon can not only chemically remove aldehydes completely, but also ensure that the F-CADR value of the composite filter screen obtained by compounding with the filter material is 200m 3 /m 2 H or more.
More specifically, the following criteria need to be satisfied simultaneously:
(1) Before modification, the initial CTC value of the activated carbon is 60 or more.
CTC values are an indicator of the adsorption capacity of activated carbon for Volatile Organic Compounds (VOCs), which is generally independent of formaldehyde adsorption removal capacity. However, the inventors of the present invention have studied and found that such CTC values can reflect the pore structure of activated carbon, in which even if the pore volume of some activated carbons before modification itself is sufficiently large, the CTC values thereof are less than 60 due to poor pore structure or pore distribution, and such activated carbons cannot obtain composite filter screens having good performance even if modified with sufficient guanidinium salt (see, for example, comparative examples 1 and 3). Furthermore, as can be seen from the results in table 1 above, when CTC of the activated carbon before modification is less than 60, even though guanidine salt is modified at an optimum loading of 15%, and even though the pore volume of the modified activated carbon is still large, the performance of the finally obtained composite filter screen is still not good (see, for example, comparative examples 1 and 3). In contrast, as can be seen from the results of examples 1-4, to obtain a composite filter screen with good aldehyde removal performance, the activated carbon used must have an initial CTC value of 60 or more.
(2) The pore volume retention rate of the guanidine salt modified activated carbon is between 22 and 85 percent (more preferably, the pore volume retention rate is between 45 and 67 percent).
As can be seen from the results in Table 1 above, when the pore volume retention is greater than 85%, the loading of guanidine salt relative to activated carbon is less than 7.0%, which results in poor performance of the finally obtained composite filter screen due to insufficient loading of guanidine salt, i.e., the F-CADR per square meter of the composite filter screen does not reach the required 200m 3 More than/h (see, for example, comparative examples 4 and 5); when the pore volume retention rate is less than 22%, the loading of guanidine salt relative to the activated carbon is higher than 23.0%, which causes the modified activated carbon to have insufficient pore volume (the pore volume retention rate is far less than the required threshold value of 22%) because guanidine salt used for modification occupies a large amount of pore volume of the activated carbon, and causes the finally obtained composite filter screen to have poor performance, namely the F-CADR value of each square meter of the filter screen does not reach the required 200m 3 More than/h (see, for example, comparative examples 2 and 6).
Furthermore, as can be seen from the results of examples 1-4, the loading of guanidine salt relative to activated carbon can be preferably in the range of 7.0 to 23.0%, and more preferably around 15%, from the standpoint of cost and composite screen performance, which can ensure that the pore volume retention is in the preferred range of 45% to 67% while ensuring sufficient guanidine salt to chemically remove formaldehyde (see, e.g., examples 1 and 3).
In conclusion, the guanidine salt modified activated carbon with good aldehyde removal performance can be obtained only by simultaneously meeting the requirements that the initial CTC value before the activated carbon is modified is more than 60 and the volume retention rate of activated carbon pores after the guanidine salt is modified is between 22% and 85% (more preferably, the ratio is 45% to 67%), so that the guanidine salt modified activated carbon not only can completely remove aldehyde substances in a chemical reaction manner, but also can ensure that the F-CADR value of a composite filter screen obtained by compounding the guanidine salt modified activated carbon with a filter material is 200m 3 /m 2 H or more.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (11)

1. A guanidine salt modified activated carbon for removing aldehydes, characterized in that the guanidine salt modified activated carbon satisfies the following criteria: (1) The initial CTC value of the activated carbon prior to guanidine salt modification is 60 or greater; and (2) the pore volume retention of the activated carbon after guanidine salt modification is between 22% and 85%, wherein the CTC value is a carbon tetrachloride value determined according to JIS 1474 standard method.
2. The guanidine salt modified activated carbon for aldehyde removal according to claim 1, wherein the activated carbon has a pore volume retention of between 45% and 67% after guanidine salt modification.
3. A method of preparing a guanidinium-modified activated carbon for aldehyde removal comprising:
mixing activated carbon and a guanidine salt aqueous solution and uniformly stirring to load guanidine salt on the surface of the activated carbon by an impregnation method;
drying the obtained mixture at the temperature of 80-100 ℃ under stirring to obtain the guanidine salt modified activated carbon,
wherein the guanidine salt modified activated carbon meets the following indexes: (1) The initial CTC value of the activated carbon prior to guanidine salt modification is 60 or greater; and (2) the pore volume retention of the activated carbon after guanidine salt modification is between 22% and 85%.
4. The method of claim 3, wherein the guanidine salt is guanidine carbonate.
5. The method of claim 3, wherein the activated carbon has a pore volume retention of between 45% and 67% after guanidine salt modification.
6. The method according to claim 3, wherein the loading amount of guanidine salt is 7.0 to 23.0 mass% with respect to the mass of the activated carbon.
7. A composite screen for removing aldehydes, the composite screen comprising a filter medium and the guanidine salt-modified activated carbon according to any one of claims 1 to 2 or the guanidine salt-modified activated carbon prepared by the method according to any one of claims 3 to 6, compounded on the filter medium, wherein the F-CADR value per square meter of the composite screen is 200m 3 And/h or more, wherein the F-CADR value refers to the clean air output ratio after formaldehyde removal determined according to GB/T-18801.
8. The composite screen of claim 7, wherein the guanidine salt modified activated carbon is composited onto the filter by coating or adsorption.
9. The composite filter screen of claim 7, wherein the guanidine salt modified activated carbon is loaded on the filter media in an amount of 200-400 g/m 2 。
10. An air cleaning device comprising the composite screen according to any one of claims 7-9.
11. The air cleaning device according to claim 10, wherein the air cleaning device has an air volume of 350-450m 3 An air purifier of/h.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09313828A (en) * 1996-05-31 1997-12-09 Matsushita Electric Works Ltd Filter
JP2009247978A (en) * 2008-04-04 2009-10-29 Eiko:Kk Adsorbent for lower aldehydes
CN108854961A (en) * 2018-07-06 2018-11-23 东莞市万恩环保科技有限公司 It is a kind of to have the indoor load type active carbon for removing formaldehyde and fungus and mildew resistance function

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09313828A (en) * 1996-05-31 1997-12-09 Matsushita Electric Works Ltd Filter
JP2009247978A (en) * 2008-04-04 2009-10-29 Eiko:Kk Adsorbent for lower aldehydes
CN108854961A (en) * 2018-07-06 2018-11-23 东莞市万恩环保科技有限公司 It is a kind of to have the indoor load type active carbon for removing formaldehyde and fungus and mildew resistance function

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